| OAA | Blue Cross Blue Shield of Massachusetts | https://home.bluecrossma.com/ |
| OAC | Anthem Blue Cross Blue Shield of Ohio | https://www.anthem.com/individual-and-family/health-insurance/ohio |
| OAD | Blue Cross Blue Shield of Western New York | https://www.bcbswny.com/ |
| OAG | Anthem Blue Cross Blue Shield of Colorado | https://www.anthem.com/individual-and-family/health-insurance/colorado/ |
| OAH | Empire Blue Cross Blue Shield of New York | https://www.empireblue.com/ |
| OAI | Blue Shield of California | https://blueshieldcaplans.com/ |
| OAJ | Carefirst Blue Cross Blue Shield of Maryland | https://individual.carefirst.com/individuals-families/home.page |
| OAM | Highmark BCBS | https://www.highmarkbcbs.com/home/ |
| OAN | Carefirst Blue Cross Blue Shield of Maryland | https://individual.carefirst.com/individuals-families/home.page |
| OAO | No Prefix Assigned | N/A |
| OAP | Anthem Blue Cross Blue Shield of Kentucky | https://www.anthem.com/individual-and-family/health-insurance/kentucky/ |
| OAQ | Carefirst Blue Cross Blue Shield of Maryland | https://individual.carefirst.com/individuals-families/home.page |
| OAS | Anthem Blue Cross Blue Shield of Ohio | https://www.anthem.com/individual-and-family/health-insurance/ohio |
| OAT | Blue Cross Blue Shield of Nebraska | https://www.nebraskablue.com/ |
| OAU | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OAV | No Prefix Assigned | N/A |
| OAW | No Prefix Assigned | N/A |
| OAX | Carefirst Blue Cross Blue Shield of Maryland | https://individual.carefirst.com/individuals-families/home.page |
| OAZ | Blue Cross Blue Shield of Massachusetts | https://home.bluecrossma.com/ |
| OBA | Anthem Blue Cross of California | https://www.anthem.com/ca/individual-and-family/health-insurance/california/ |
| OBB | Highmark BCBS | https://www.highmarkbcbs.com/home/ |
| OBC | Blue Cross Blue Shield of Massachusetts | https://home.bluecrossma.com/ |
| OBE | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OBF | Highmark BCBS | https://www.highmarkbcbs.com/home/ |
| OBG | Blue Cross Blue Shield of Tennessee | https://www.bcbst.com/get-insurance/index.page |
| OBH | No Prefix Assigned | N/A |
| OBI | Blue Cross Blue Shield of Minnesota | https://www.bluecrossmn.com/ |
| OBJ | Premera Blue Cross | https://www.premera.com/visitor |
| OBK | Anthem Blue Cross Blue Shield of Ohio | https://www.anthem.com/individual-and-family/health-insurance/ohio |
| OBL | Carefirst Blue Cross Blue Shield of Maryland | https://individual.carefirst.com/individuals-families/home.page |
| OBM | Carefirst Blue Cross Blue Shield of Maryland | https://individual.carefirst.com/individuals-families/home.page |
| OBO | Highmark BCBS | https://www.highmarkblueshield.com/home/ |
| OBQ | Anthem Blue Cross of California | https://www.anthem.com/ca/individual-and-family/health-insurance/california/ |
| OBR | Wellmark BCBS | https://www.wellmark.com/ |
| OBT | Blue Cross Blue Shield of Arizona | https://www.azblue.com/individualsandfamilies |
| OBU | Blue Cross Blue Shield of Alabama | https://www.bcbsal.org/web/index.html |
| OBV | Anthem Blue Cross Blue Shield of Georgia | https://www.anthem.com/individual-and-family/health-insurance/georgia/ |
| OBW | Independence Blue Cross | https://www.ibx.com/index.jsp |
| OBX | Anthem Blue Cross Blue Shield of Georgia | https://www.anthem.com/individual-and-family/health-insurance/georgia/ |
| OBY | Carefirst Blue Cross Blue Shield of Maryland | https://individual.carefirst.com/individuals-families/home.page |
| OBZ | Blue Shield of California | https://blueshieldcaplans.com/ |
| OCA | Anthem Blue Cross of California | https://www.anthem.com/ca/individual-and-family/health-insurance/california/ |
| OCC | No Prefix Assigned | N/A |
| OCF | Anthem Blue Cross Blue Shield of Virginia | https://www.anthem.com/individual-and-family/health-insurance/virginia/ |
| OCI | Anthem Blue Cross Blue Shield of Wisconsin | https://www.anthem.com/individual-and-family/wisconsin/ |
| OCL | No Prefix Assigned | N/A |
| OCM | Wellmark BCBS | https://www.wellmark.com/ |
| OCO | Blue Shield of California | https://blueshieldcaplans.com/ |
| OCP | Anthem Blue Cross Blue Shield of Ohio | https://www.anthem.com/individual-and-family/health-insurance/ohio |
| OCQ | Independence Blue Cross | https://www.ibx.com/index.jsp |
| OCR | Independence Blue Cross | https://www.ibx.com/index.jsp |
| OCS | No Prefix Assigned | N/A |
| OCU | Anthem Blue Cross Blue Shield of Ohio | https://www.anthem.com/individual-and-family/health-insurance/ohio |
| OCV | Carefirst Blue Cross Blue Shield of Maryland | https://individual.carefirst.com/individuals-families/home.page |
| OCW | Anthem Blue Cross of California | https://www.anthem.com/ca/individual-and-family/health-insurance/california/ |
| OCX | Carefirst Blue Cross Blue Shield of Maryland | https://individual.carefirst.com/individuals-families/home.page |
| OCY | Carefirst Blue Cross Blue Shield of Maryland | https://individual.carefirst.com/individuals-families/home.page |
| OCZ | Independence Blue Cross | https://www.ibx.com/index.jsp |
| ODB | Anthem Blue Cross Blue Shield of Ohio | https://www.anthem.com/individual-and-family/health-insurance/ohio |
| ODC | No Prefix Assigned | N/A |
| ODD | Blue Cross Blue Shield of Nebraska | https://www.nebraskablue.com/ |
| ODE | Blue Cross of Idaho | https://www.bcidaho.com/ |
| ODG | No Prefix Assigned | N/A |
| ODI | Blue Cross Blue Shield of Western New York | https://www.bcbswny.com/ |
| ODJ | Blue Cross Blue Shield of Tennessee | https://www.bcbst.com/get-insurance/index.page |
| ODK | Carefirst Blue Cross Blue Shield of Maryland | https://individual.carefirst.com/individuals-families/home.page |
| ODM | Blue Cross Blue Shield of Arizona | https://www.azblue.com/individualsandfamilies |
| ODN | Blue Cross Blue Shield of Tennessee | https://www.bcbst.com/get-insurance/index.page |
| ODQ | Highmark BCBS | https://www.highmarkblueshield.com/home/ |
| ODR | Carefirst Blue Cross Blue Shield of Maryland | https://individual.carefirst.com/individuals-families/home.page |
| ODU | No Prefix Assigned | N/A |
| ODV | Wellmark BCBS | https://www.wellmark.com/ |
| ODW | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| ODY | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| ODZ | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OEA | Anthem Blue Cross Blue Shield of Virginia | https://www.anthem.com/individual-and-family/health-insurance/virginia/ |
| OEB | Anthem Blue Cross Blue Shield of Virginia | https://www.anthem.com/individual-and-family/health-insurance/virginia/ |
| OEC | Excellus Blue Cross Blue Shield of New York | https://www.excellusbcbs.com/ |
| OEE | Blue Cross Blue Shield of Florida | https://www.floridablue.com/ |
| OEF | Carefirst Blue Cross Blue Shield of Maryland | https://individual.carefirst.com/individuals-families/home.page |
| OEG | Unknown Assignment | https://www.bcbs.com/ |
| OEH | Anthem Blue Cross of California | https://www.anthem.com/ca/individual-and-family/health-insurance/california/ |
| OEI | Blue Cross Blue Shield of Nebraska | https://www.nebraskablue.com/ |
| OEJ | Blue Shield of California | https://blueshieldcaplans.com/ |
| OEL | Carefirst Blue Cross Blue Shield of Maryland | https://individual.carefirst.com/individuals-families/home.page |
| OEN | No Prefix Assigned | N/A |
| OEO | Blue Shield of California | https://blueshieldcaplans.com/ |
| OEP | Capital Blue Cross | https://www.capbluecross.com/ |
| OEQ | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OER | Regence BCBS | https://www.regence.com/member/home |
| OET | Carefirst Blue Cross Blue Shield of Maryland | https://individual.carefirst.com/individuals-families/home.page |
| OEX | Anthem Blue Cross of California | https://www.anthem.com/ca/individual-and-family/health-insurance/california/ |
| OEY | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OEZ | Blue Cross Blue Shield of South Carolina | https://www.southcarolinablues.com/web/public/brands/sc/ |
| OFA | Anthem Blue Cross Blue Shield of Ohio | https://www.anthem.com/individual-and-family/health-insurance/ohio |
| OFB | Capital Blue Cross | https://www.capbluecross.com/ |
| OFC | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OFD | Highmark BCBS | https://www.highmarkbcbsde.com/home/ |
| OFE | No Prefix Assigned | N/A |
| OFF | Blue Cross Blue Shield of Western New York | https://www.bcbswny.com/ |
| OFH | Anthem Blue Cross Blue Shield of Ohio | https://www.anthem.com/individual-and-family/health-insurance/ohio |
| OFI | Carefirst Blue Cross Blue Shield of Maryland | https://individual.carefirst.com/individuals-families/home.page |
| OFJ | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OFK | No Prefix Assigned | N/A |
| OFL | Carefirst Blue Cross Blue Shield of Maryland | https://individual.carefirst.com/individuals-families/home.page |
| OFM | Carefirst Blue Cross Blue Shield of Maryland | https://individual.carefirst.com/individuals-families/home.page |
| OFN | Blue Cross Blue Shield of Tennessee | https://www.bcbst.com/get-insurance/index.page |
| OFO | Anthem Blue Cross of California | https://www.anthem.com/ca/individual-and-family/health-insurance/california/ |
| OFP | Anthem Blue Cross of California | https://www.anthem.com/ca/individual-and-family/health-insurance/california/ |
| OFQ | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OFR | No Prefix Assigned | N/A |
| OFT | Blue Shield of California | https://blueshieldcaplans.com/ |
| OFU | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OFV | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OFW | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OFX | Anthem Blue Cross Blue Shield of Missouri | https://www.anthem.com/individual-and-family/health-insurance/missouri/ |
| OFZ | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OGC | Wellmark BCBS | https://www.wellmark.com/ |
| OGE | Blue Cross Blue Shield of Oklahoma | https://www.bcbsok.com/ |
| OGG | No Prefix Assigned | N/A |
| OGH | Anthem Blue Cross Blue Shield of Georgia | https://www.anthem.com/individual-and-family/health-insurance/georgia/ |
| OGK | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OGL | Wellmark BCBS | https://www.wellmark.com/ |
| OGM | Premera Blue Cross | https://www.premera.com/visitor |
| OGN | Anthem Blue Cross Blue Shield of Kentucky | https://www.anthem.com/individual-and-family/health-insurance/kentucky/ |
| OGP | No Prefix Assigned | N/A |
| OGQ | No Prefix Assigned | N/A |
| OGR | Wellmark BCBS | https://www.wellmark.com/ |
| OGS | Blue Cross Blue Shield of Louisiana | https://www.bcbsla.com/ |
| OGT | Blue Cross Blue Shield of Western New York | https://www.bcbswny.com/ |
| OGV | No Prefix Assigned | N/A |
| OGX | Carefirst Blue Cross Blue Shield of Maryland | https://individual.carefirst.com/individuals-families/home.page |
| OGY | No Prefix Assigned | N/A |
| OGZ | No Prefix Assigned | N/A |
| OHA | Blue Cross Blue Shield of South Carolina | https://www.southcarolinablues.com/web/public/brands/sc/ |
| OHB | Anthem Blue Cross Blue Shield of Ohio | https://www.anthem.com/individual-and-family/health-insurance/ohio |
| OHC | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OHD | Blue Cross Blue Shield of Texas | https://www.bcbstx.com/ |
| OHE | Blue Cross Blue Shield of Rhode Island | https://www.bcbsri.com/ |
| OHF | Anthem Blue Cross Blue Shield of Virginia | https://www.anthem.com/individual-and-family/health-insurance/virginia/ |
| OHG | Anthem Blue Cross Blue Shield of Virginia | https://www.anthem.com/individual-and-family/health-insurance/virginia/ |
| OHH | Anthem Blue Cross Blue Shield of Ohio | https://www.anthem.com/individual-and-family/health-insurance/ohio |
| OHJ | Anthem Blue Cross Blue Shield of Kentucky | https://www.anthem.com/individual-and-family/health-insurance/kentucky/ |
| OHK | Wellmark BCBS | https://www.wellmark.com/ |
| OHN | Wellmark BCBS | https://www.wellmark.com/ |
| OHO | Anthem Blue Cross Blue Shield of Ohio | https://www.anthem.com/individual-and-family/health-insurance/ohio |
| OHP | Anthem Blue Cross Blue Shield of Ohio | https://www.anthem.com/individual-and-family/health-insurance/ohio |
| OHQ | No Prefix Assigned | N/A |
| OHR | Anthem Blue Cross Blue Shield of Colorado | https://www.anthem.com/individual-and-family/health-insurance/colorado/ |
| OHS | Anthem Blue Cross Blue Shield of Ohio | https://www.anthem.com/individual-and-family/health-insurance/ohio |
| OHT | Anthem Blue Cross Blue Shield of Ohio | https://www.anthem.com/individual-and-family/health-insurance/ohio |
| OHU | Wellmark BCBS | https://www.wellmark.com/ |
| OHW | Wellmark BCBS | https://www.wellmark.com/ |
| OHX | Blue Cross Blue Shield of Rhode Island | https://www.bcbsri.com/ |
| OHY | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OHZ | Blue Cross Blue Shield of Rhode Island | https://www.bcbsri.com/ |
| OIB | Highmark BCBS | https://www.highmarkbcbs.com/home/ |
| OIC | Independence Blue Cross | https://www.ibx.com/index.jsp |
| OIE | No Prefix Assigned | N/A |
| OII | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OIJ | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OIK | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OIL | Highmark BCBS | https://www.highmarkbcbs.com/home/ |
| OIM | Independence Blue Cross | https://www.ibx.com/index.jsp |
| OIN | Highmark BCBS | https://www.highmarkbcbs.com/home/ |
| OIO | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OIP | Blue Shield of California | https://blueshieldcaplans.com/ |
| OIQ | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OIS | Blue Cross Blue Shield of Western New York | https://www.bcbswny.com/ |
| OIT | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OIU | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OIV | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OIW | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OIX | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OIY | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OIZ | Anthem Blue Cross of California | https://www.anthem.com/ca/individual-and-family/health-insurance/california/ |
| OJA | No Prefix Assigned | N/A |
| OJB | Carefirst Blue Cross Blue Shield of Maryland | https://individual.carefirst.com/individuals-families/home.page |
| OJC | Wellmark BCBS | https://www.wellmark.com/ |
| OJD | No Prefix Assigned | N/A |
| OJE | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OJF | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OJG | Anthem Blue Cross Blue Shield of Wisconsin | https://www.anthem.com/individual-and-family/wisconsin/ |
| OJH | Anthem Blue Cross Blue Shield of Georgia | https://www.anthem.com/individual-and-family/health-insurance/georgia/ |
| OJI | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OJK | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OJL | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OJN | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OJQ | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OJR | Wellmark BCBS | https://www.wellmark.com/ |
| OJS | No Prefix Assigned | N/A |
| OJT | Carefirst Blue Cross Blue Shield of Maryland | https://individual.carefirst.com/individuals-families/home.page |
| OJU | No Prefix Assigned | N/A |
| OJV | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OJY | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OKA | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OKB | Carefirst Blue Cross Blue Shield of Maryland | https://individual.carefirst.com/individuals-families/home.page |
| OKC | Blue Cross Blue Shield of Oklahoma | https://www.bcbsok.com/ |
| OKD | Independence Blue Cross | https://www.ibx.com/index.jsp |
| OKE | Carefirst Blue Cross Blue Shield of Maryland | https://individual.carefirst.com/individuals-families/home.page |
| OKF | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OKG | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OKH | Anthem Blue Cross of California | https://www.anthem.com/ca/individual-and-family/health-insurance/california/ |
| OKI | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OKJ | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OKK | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OKM | Independence Blue Cross | https://www.ibx.com/index.jsp |
| OKN | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OKO | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OKQ | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OKR | Anthem Blue Cross Blue Shield of Colorado | https://www.anthem.com/individual-and-family/health-insurance/colorado/ |
| OKS | Blue Cross Blue Shield of Western New York | https://www.bcbswny.com/ |
| OKT | Anthem Blue Cross Blue Shield of Ohio | https://www.anthem.com/individual-and-family/health-insurance/ohio |
| OKW | Anthem Blue Cross of California | https://www.anthem.com/ca/individual-and-family/health-insurance/california/ |
| OKX | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OKY | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OKZ | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OLA | Unknown Assignment | https://www.bcbs.com/ |
| OLB | Wellmark BCBS | https://www.wellmark.com/ |
| OLC | No Prefix Assigned | N/A |
| OLE | No Prefix Assigned | N/A |
| OLF | No Prefix Assigned | N/A |
| OLG | Premera Blue Cross | https://www.premera.com/visitor |
| OLH | Blue Cross Blue Shield of Arizona | https://www.azblue.com/individualsandfamilies |
| OLI | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OLJ | No Prefix Assigned | N/A |
| OLK | No Prefix Assigned | N/A |
| OLL | Carefirst Blue Cross Blue Shield of Maryland | https://individual.carefirst.com/individuals-families/home.page |
| OLM | Blue Cross Blue Shield of Arkansas | http://www.arkansasbluecross.com/looking-for-insurance |
| OLO | Blue Shield of California | https://blueshieldcaplans.com/ |
| OLP | Blue Cross Blue Shield of Western New York | https://www.bcbswny.com/ |
| OLQ | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OLS | Carefirst Blue Cross Blue Shield of Maryland | https://individual.carefirst.com/individuals-families/home.page |
| OLT | Wellmark BCBS | https://www.wellmark.com/ |
| OLU | Anthem Blue Cross Blue Shield of Colorado | https://www.anthem.com/individual-and-family/health-insurance/colorado/ |
| OLW | Blue Cross Blue Shield of Western New York | https://www.bcbswny.com/ |
| OLX | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OLY | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OLZ | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OMA | Anthem Blue Cross Blue Shield of Ohio | https://www.anthem.com/individual-and-family/health-insurance/ohio |
| OMB | Anthem Blue Cross Blue Shield of Ohio | https://www.anthem.com/individual-and-family/health-insurance/ohio |
| OMC | No Prefix Assigned | N/A |
| OME | Wellmark BCBS | https://www.wellmark.com/ |
| OMF | No Prefix Assigned | N/A |
| OMG | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OMH | Blue Shield of California | https://blueshieldcaplans.com/ |
| OMI | Anthem Blue Cross Blue Shield of Georgia | https://www.anthem.com/individual-and-family/health-insurance/georgia/ |
| OMJ | No Prefix Assigned | N/A |
| OMM | Anthem Blue Cross of California | https://www.anthem.com/ca/individual-and-family/health-insurance/california/ |
| OMN | No Prefix Assigned | N/A |
| OMO | Blue Shield of California | https://blueshieldcaplans.com/ |
| OMP | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OMT | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OMU | Blue Cross of Idaho | https://www.bcidaho.com/ |
| OMW | Blue Cross Blue Shield of Nebraska | https://www.nebraskablue.com/ |
| OMY | No Prefix Assigned | N/A |
| OMZ | Blue Shield of California | https://blueshieldcaplans.com/ |
| ONA | Anthem Blue Cross Blue Shield of Missouri | https://www.anthem.com/individual-and-family/health-insurance/missouri/ |
| ONB | Anthem Blue Cross Blue Shield of Ohio | https://www.anthem.com/individual-and-family/health-insurance/ohio |
| OND | Wellmark BCBS | https://www.wellmark.com/ |
| ONF | No Prefix Assigned | N/A |
| ONG | Blue Cross Blue Shield of Massachusetts | https://home.bluecrossma.com/ |
| ONI | Anthem Blue Cross Blue Shield of Indiana | https://www.anthem.com/individual-and-family/health-insurance/indiana/ |
| ONJ | Wellmark BCBS | https://www.wellmark.com/ |
| ONK | No Prefix Assigned | N/A |
| ONL | Anthem Blue Cross Blue Shield of Ohio | https://www.anthem.com/individual-and-family/health-insurance/ohio |
| ONN | Blue Cross Blue Shield of South Carolina | https://www.southcarolinablues.com/web/public/brands/sc/ |
| ONO | Blue Shield of California | https://blueshieldcaplans.com/ |
| ONP | Anthem Blue Cross Blue Shield of Missouri | https://www.anthem.com/individual-and-family/health-insurance/missouri/ |
| ONQ | Blue Cross Blue Shield of Alabama | https://www.bcbsal.org/web/index.html |
| ONR | No Prefix Assigned | N/A |
| ONS | Blue Cross Blue Shield of Alabama | https://www.bcbsal.org/web/index.html |
| ONU | Carefirst Blue Cross Blue Shield of Maryland | https://individual.carefirst.com/individuals-families/home.page |
| ONV | Carefirst Blue Cross Blue Shield of Maryland | https://individual.carefirst.com/individuals-families/home.page |
| ONW | Anthem Blue Cross Blue Shield of Indiana | https://www.anthem.com/individual-and-family/health-insurance/indiana/ |
| OOB | Blue Shield of California | https://blueshieldcaplans.com/ |
| OOD | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OOE | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OOF | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OOG | Blue Shield of California | https://blueshieldcaplans.com/ |
| OOH | Independence Blue Cross | https://www.ibx.com/index.jsp |
| OOI | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OOJ | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OOK | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OOL | Blue Cross Blue Shield of Rhode Island | https://www.bcbsri.com/ |
| OON | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OOP | Blue Shield of California | https://blueshieldcaplans.com/ |
| OOQ | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OOR | Blue Cross Blue Shield of North Carolina | https://www.bluecrossnc.com/ |
| OOT | Blue Shield of California | https://blueshieldcaplans.com/ |
| OOV | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OOW | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OOX | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OOY | No Prefix Assigned | N/A |
| OOZ | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OPA | Blue Cross Blue Shield of Louisiana | https://www.bcbsla.com/ |
| OPB | Highmark BCBS | https://www.highmarkblueshield.com/home/ |
| OPC | No Prefix Assigned | N/A |
| OPE | Anthem Blue Cross Blue Shield of Georgia | https://www.anthem.com/individual-and-family/health-insurance/georgia/ |
| OPG | Anthem Blue Cross of California | https://www.anthem.com/ca/individual-and-family/health-insurance/california/ |
| OPH | No Prefix Assigned | N/A |
| OPI | Blue Cross Blue Shield of North Carolina | https://www.bluecrossnc.com/ |
| OPL | No Prefix Assigned | N/A |
| OPN | No Prefix Assigned | N/A |
| OPO | No Prefix Assigned | N/A |
| OPP | Wellmark BCBS | https://www.wellmark.com/ |
| OPQ | No Prefix Assigned | N/A |
| OPR | Wellmark BCBS | https://www.wellmark.com/ |
| OPT | Carefirst Blue Cross Blue Shield of Maryland | https://individual.carefirst.com/individuals-families/home.page |
| OPU | Anthem Blue Cross Blue Shield of Wisconsin | https://www.anthem.com/individual-and-family/wisconsin/ |
| OPY | Independence Blue Cross | https://www.ibx.com/index.jsp |
| OPZ | Anthem Blue Cross Blue Shield of Wisconsin | https://www.anthem.com/individual-and-family/wisconsin/ |
| OQA | Anthem Blue Cross Blue Shield of Ohio | https://www.anthem.com/individual-and-family/health-insurance/ohio |
| OQC | Independence Blue Cross | https://www.ibx.com/index.jsp |
| OQD | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OQE | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OQF | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OQG | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OQH | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OQI | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OQJ | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OQK | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OQL | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OQM | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OQN | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OQO | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OQP | Anthem Blue Cross of California | https://www.anthem.com/ca/individual-and-family/health-insurance/california/ |
| OQQ | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OQR | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OQT | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OQU | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OQV | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OQW | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OQX | No Prefix Assigned | N/A |
| OQY | No Prefix Assigned | N/A |
| OQZ | No Prefix Assigned | N/A |
| ORA | Wellmark BCBS | https://www.wellmark.com/ |
| ORB | Wellmark BCBS | https://www.wellmark.com/ |
| ORC | Anthem Blue Cross Blue Shield of Kentucky | https://www.anthem.com/individual-and-family/health-insurance/kentucky/ |
| ORD | Independence Blue Cross | https://www.ibx.com/index.jsp |
| ORE | Blue Cross Blue Shield of Tennessee | https://www.bcbst.com/get-insurance/index.page |
| ORG | No Prefix Assigned | N/A |
| ORI | Blue Cross Blue Shield of South Carolina | https://www.southcarolinablues.com/web/public/brands/sc/ |
| ORJ | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| ORK | Anthem Blue Cross Blue Shield of Ohio | https://www.anthem.com/individual-and-family/health-insurance/ohio |
| ORL | Anthem Blue Cross of California | https://www.anthem.com/ca/individual-and-family/health-insurance/california/ |
| ORO | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| ORP | Anthem Blue Cross of California | https://www.anthem.com/ca/individual-and-family/health-insurance/california/ |
| ORQ | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| ORS | Regence BCBS | https://www.regence.com/member/home |
| ORU | Blue Cross Blue Shield of Tennessee | https://www.bcbst.com/get-insurance/index.page |
| ORV | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| ORW | No Prefix Assigned | N/A |
| ORX | Blue Cross of Idaho | https://www.bcidaho.com/ |
| ORY | Blue Shield of California | https://blueshieldcaplans.com/ |
| ORZ | Horizon Blue Cross Blue Shield of New Jersey | https://www.horizonblue.com/ |
| OSB | Blue Cross Blue Shield of Alabama | https://www.bcbsal.org/web/index.html |
| OSC | No Prefix Assigned | N/A |
| OSD | No Prefix Assigned | N/A |
| OSE | Blue Cross Blue Shield of Arizona | https://www.azblue.com/individualsandfamilies |
| OSH | Carefirst Blue Cross Blue Shield of Maryland | https://individual.carefirst.com/individuals-families/home.page |
| OSI | Independence Blue Cross | https://www.ibx.com/index.jsp |
| OSJ | Anthem Blue Cross Blue Shield of Ohio | https://www.anthem.com/individual-and-family/health-insurance/ohio |
| OSL | Blue Cross Blue Shield of Nebraska | https://www.nebraskablue.com/ |
| OSM | Blue Cross Blue Shield of Illinois | https://www.bcbsil.com/ |
| OSN | Anthem Blue Cross Blue Shield of Ohio | https://www.anthem.com/individual-and-family/health-insurance/ohio |
| OSP | Blue Cross Blue Shield of Florida | https://www.floridablue.com/ |
| OSQ | Highmark BCBS | https://www.highmarkbcbs.com/home/ |
| OSU | No Prefix Assigned | N/A |
| OSW | No Prefix Assigned | N/A |
| OSY | Unknown Assignment | https://www.bcbs.com/ |
| OSZ | Anthem Blue Cross Blue Shield of Virginia | https://www.anthem.com/individual-and-family/health-insurance/virginia/ |
| OTA | Blue Cross Blue Shield of Florida | https://www.floridablue.com/ |
| OTC | Blue Cross Blue Shield of Nebraska | https://www.nebraskablue.com/ |
| OTD | Anthem Blue Cross of California | https://www.anthem.com/ca/individual-and-family/health-insurance/california/ |
| OTE | Anthem Blue Cross Blue Shield of Indiana | https://www.anthem.com/individual-and-family/health-insurance/indiana/ |
| OTF | Anthem Blue Cross Blue Shield of Indiana | https://www.anthem.com/individual-and-family/health-insurance/indiana/ |
| OTG | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OTH | Blue Cross Blue Shield of Tennessee | https://www.bcbst.com/get-insurance/index.page |
| OTJ | Carefirst Blue Cross Blue Shield of Maryland | https://individual.carefirst.com/individuals-families/home.page |
| OTK | Wellmark BCBS | https://www.wellmark.com/ |
| OTL | Blue Cross Blue Shield of Alabama | https://www.bcbsal.org/web/index.html |
| OTO | Blue Cross Blue Shield of North Dakota | https://www.bcbsnd.com/ |
| OTP | Blue Shield of California | https://blueshieldcaplans.com/ |
| OTQ | No Prefix Assigned | N/A |
| OTR | No Prefix Assigned | N/A |
| OTT | Wellmark BCBS | https://www.wellmark.com/ |
| OTU | Wellmark BCBS | https://www.wellmark.com/ |
| OTW | Anthem Blue Cross Blue Shield of Georgia | https://www.anthem.com/individual-and-family/health-insurance/georgia/ |
| OTZ | Anthem Blue Cross Blue Shield of Ohio | https://www.anthem.com/individual-and-family/health-insurance/ohio |
| OUA | Regence BCBS | https://www.regence.com/member/home |
| OUB | Blue Cross Blue Shield of Rhode Island | https://www.bcbsri.com/ |
| OUC | Blue Cross Blue Shield of South Carolina | https://www.southcarolinablues.com/web/public/brands/sc/ |
| OUD | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OUE | Blue Cross Blue Shield of Rhode Island | https://www.bcbsri.com/ |
| OUF | Regence BCBS | https://www.regence.com/member/home |
| OUH | Empire Blue Cross Blue Shield of New York | https://www.empireblue.com/ |
| OUI | Horizon Blue Cross Blue Shield of New Jersey | https://www.horizonblue.com/ |
| OUJ | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OUK | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OUL | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OUM | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OUO | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OUP | Wellmark BCBS | https://www.wellmark.com/ |
| OUQ | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OUS | No Prefix Assigned | N/A |
| OUT | Horizon Blue Cross Blue Shield of New Jersey | https://www.horizonblue.com/ |
| OUU | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OUV | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OUX | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OUY | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OUZ | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OVB | No Prefix Assigned | N/A |
| OVD | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OVE | No Prefix Assigned | N/A |
| OVF | No Prefix Assigned | N/A |
| OVH | Premera Blue Cross | https://www.premera.com/visitor |
| OVI | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OVJ | No Prefix Assigned | N/A |
| OVK | No Prefix Assigned | N/A |
| OVL | Blue Cross Blue Shield of Western New York | https://www.bcbswny.com/ |
| OVM | Wellmark BCBS | https://www.wellmark.com/ |
| OVN | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OVO | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OVP | Anthem Blue Cross Blue Shield of Ohio | https://www.anthem.com/individual-and-family/health-insurance/ohio |
| OVQ | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OVS | Anthem Blue Cross Blue Shield of Ohio | https://www.anthem.com/individual-and-family/health-insurance/ohio |
| OVT | Anthem Blue Cross Blue Shield of Indiana | https://www.anthem.com/individual-and-family/health-insurance/indiana/ |
| OVU | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OVV | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OVX | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OVY | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OVZ | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OWA | Wellmark BCBS | https://www.wellmark.com/ |
| OWB | Carefirst Blue Cross Blue Shield of Maryland | https://individual.carefirst.com/individuals-families/home.page |
| OWC | Regence BCBS | https://www.regence.com/member/home |
| OWD | Carefirst Blue Cross Blue Shield of Maryland | https://individual.carefirst.com/individuals-families/home.page |
| OWE | Blue Cross Blue Shield of Florida | https://www.floridablue.com/ |
| OWF | Wellmark BCBS | https://www.wellmark.com/ |
| OWG | Blue Cross Blue Shield of Western New York | https://www.bcbswny.com/ |
| OWI | Anthem Blue Cross Blue Shield of Ohio | https://www.anthem.com/individual-and-family/health-insurance/ohio |
| OWJ | Anthem Blue Cross Blue Shield of Virginia | https://www.anthem.com/individual-and-family/health-insurance/virginia/ |
| OWM | No Prefix Assigned | N/A |
| OWN | No Prefix Assigned | N/A |
| OWO | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OWP | Empire Blue Cross Blue Shield of New York | https://www.empireblue.com/ |
| OWQ | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OWT | Anthem Blue Cross Blue Shield of Georgia | https://www.anthem.com/individual-and-family/health-insurance/georgia/ |
| OWU | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OWV | No Prefix Assigned | N/A |
| OWX | Anthem Blue Cross Blue Shield of Ohio | https://www.anthem.com/individual-and-family/health-insurance/ohio |
| OWY | Anthem Blue Cross Blue Shield of Ohio | https://www.anthem.com/individual-and-family/health-insurance/ohio |
| OWZ | Wellmark BCBS | https://www.wellmark.com/ |
| OXA | Blue Cross Blue Shield of Western New York | https://www.bcbswny.com/ |
| OXB | Regence BCBS | https://www.regence.com/member/home |
| OXD | Anthem Blue Cross of California | https://www.anthem.com/ca/individual-and-family/health-insurance/california/ |
| OXF | No Prefix Assigned | N/A |
| OXG | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OXH | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OXI | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OXJ | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OXK | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OXL | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OXM | Premera Blue Cross | https://www.premera.com/visitor |
| OXN | Regence BCBS | https://www.regence.com/member/home |
| OXO | Blue Cross Blue Shield of Western New York | https://www.bcbswny.com/ |
| OXP | Anthem Blue Cross of California | https://www.anthem.com/ca/individual-and-family/health-insurance/california/ |
| OXQ | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OXR | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OXS | Blue Shield of California | https://blueshieldcaplans.com/ |
| OXU | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OXV | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OXW | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OXZ | No Prefix Assigned | N/A |
| OYA | Wellmark BCBS | https://www.wellmark.com/ |
| OYB | Anthem Blue Cross of California | https://www.anthem.com/ca/individual-and-family/health-insurance/california/ |
| OYC | Horizon Blue Cross Blue Shield of New Jersey | https://www.horizonblue.com/ |
| OYD | Blue Cross of Idaho | https://www.bcidaho.com/ |
| OYF | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OYG | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OYH | Anthem Blue Cross Blue Shield of Ohio | https://www.anthem.com/individual-and-family/health-insurance/ohio |
| OYI | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OYJ | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OYK | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OYL | Blue Shield of California | https://blueshieldcaplans.com/ |
| OYN | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OYO | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OYP | Anthem Blue Cross Blue Shield of Georgia | https://www.anthem.com/individual-and-family/health-insurance/georgia/ |
| OYR | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OYS | Blue Shield of California | https://blueshieldcaplans.com/ |
| OYT | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OYU | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OYV | No Prefix Assigned | N/A |
| OYW | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OYY | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OYZ | No Prefix Assigned | N/A |
| OZB | Anthem Blue Cross Blue Shield of Wisconsin | https://www.anthem.com/individual-and-family/wisconsin/ |
| OZC | Horizon Blue Cross Blue Shield of New Jersey | https://www.horizonblue.com/ |
| OZD | Anthem Blue Cross Blue Shield of Virginia | https://www.anthem.com/individual-and-family/health-insurance/virginia/ |
| OZE | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OZF | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OZG | Blue Shield of California | https://blueshieldcaplans.com/ |
| OZI | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OZJ | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OZK | Anthem Blue Cross Blue Shield of Missouri | https://www.anthem.com/individual-and-family/health-insurance/missouri/ |
| OZO | No Prefix Assigned | N/A |
| OZP | Anthem Blue Cross of California | https://www.anthem.com/ca/individual-and-family/health-insurance/california/ |
| OZQ | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OZR | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OZT | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OZU | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OZV | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OZW | No Prefix Assigned | N/A |
| OZX | Anthem Blue Cross Blue Shield of Missouri | https://www.anthem.com/individual-and-family/health-insurance/missouri/ |
| OZY | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
| OZZ | Blue Cross Blue Shield of Michigan | https://www.bcbsm.com/ |
