| KAA | N/A | Not Assigned |
| KAB | Iowa, South Dakota | Wellmark BCBS |
| KAC | N/A | Not Assigned |
| KAD | Michigan | BCBS Michigan |
| KAE | Illinois | BCBS Illinois |
| KAF | South Carolina | BCBS South Carolina |
| KAG | Georgia | Anthem BCBS Georgia |
| KAH | Indiana | Anthem BCBS Indiana |
| KAI | Arizona | BCBS Arizona |
| KAJ | Louisiana | BCBS Louisiana |
| KAK | Western New York | BCBS Western New York |
| KAL | Alabama | BCBS Alabama |
| KAM | Iowa, South Dakota | Wellmark BCBS |
| KAN | N/A | Not Assigned |
| KAO | Minnesota | BCBS Minnesota |
| KAP | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| KAQ | Michigan | BCBS Michigan |
| KAR | Kansas City | BCBS Kansas City |
| KAS | N/A | Not Assigned |
| KAT | Illinois | BCBS Illinois |
| KAU | Illinois | BCBS Illinois |
| KAV | Georgia | Anthem BCBS Georgia |
| KAW | Georgia | Anthem BCBS Georgia |
| KAX | California | Anthem Blue-Cross |
| KAY | New York | Excellus BCBS New York |
| KAZ | Illinois | BCBS Illinois |
| KBA | Missouri | Anthem BCBS Missouri |
| KBB | Colorado | Anthem BCBS Colorado |
| KBC | Virginia | Anthem BCBS Virginia |
| KBD | South Carolina | BCBS South Carolina |
| KBE | Wisconsin | Anthem BCBS Wisconsin |
| KBF | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| KBG | Oregon/Idaho/Utah/Washington | Regence BCBS |
| KBH | New Jersey | Horizon BCBS New Jersey |
| KBI | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| KBJ | New York | Empire BCBS New York |
| KBK | N/A | Not Assigned |
| KBL | Wisconsin | Anthem BCBS Wisconsin |
| KBM | South Carolina | BCBS South Carolina |
| KBN | N/A | Not Assigned |
| KBO | North Carolina | BCBS North Carolina |
| KBP | District of Columbia, Maryland, Northern Virginia | Carefirst BCBS |
| KBQ | N/A | Not Assigned |
| KBR | Alaska | Premera BCBS Alaska |
| KBS | Wisconsin | Anthem BCBS Wisconsin |
| KBT | Iowa, South Dakota | Wellmark BCBS |
| KBU | South Carolina | BCBS South Carolina |
| KBV | Georgia | Anthem BCBS Georgia |
| KBW | Wisconsin | Anthem BCBS Wisconsin |
| KBX | Kentucky | Anthem BCBS Kentucky |
| KBY | New York (Northeastern) | Blue-Shield of Northeastern New York |
| KBZ | California | Anthem Blue-Cross |
| KCA | Iowa, South Dakota | Wellmark BCBS |
| KCB | Iowa, South Dakota | Wellmark BCBS |
| KCC | Georgia | Anthem BCBS Georgia |
| KCD | Oregon/Idaho/Utah/Washington | Regence BCBS |
| KCE | Ohio | Anthem BCBS Ohio |
| KCF | California | Anthem Blue-Cross |
| KCG | Illinois | BCBS Illinois |
| KCH | New York | Empire BCBS New York |
| KCI | Tennessee | BCBS Tennessee |
| KCJ | Texas | BCBS Texas |
| KCK | Ohio | Anthem BCBS Ohio |
| KCL | Minnesota | BCBS Minnesota |
| KCM | Pennsylvania | Highmark BCBS Pennsylvania |
| KCN | Pennsylvania | Highmark BCBS Pennsylvania |
| KCO | Michigan | BCBS Michigan |
| KCP | South Carolina | BCBS South Carolina |
| KCQ | Alaska | Premera BCBS Alaska |
| KCR | N/A | Not Assigned |
| KCS | Iowa, South Dakota | Wellmark BCBS |
| KCT | Oregon/Idaho/Utah/Washington | Regence BCBS |
| KCU | Michigan | BCBS Michigan |
| KCV | Iowa, South Dakota | Wellmark BCBS |
| KCW | Michigan | BCBS Michigan |
| KCX | California | Blue-Shield of California |
| KCY | Ohio | Anthem BCBS Ohio |
| KCZ | Iowa, South Dakota | Wellmark BCBS |
| KDA | Michigan | BCBS Michigan |
| KDB | Michigan | BCBS Michigan |
| KDC | Kansas City | BCBS Kansas City |
| KDD | N/A | Not Assigned |
| KDE | N/A | Not Assigned |
| KDF | South Carolina | BCBS South Carolina |
| KDG | Massachusetts | BCBS Massachusetts |
| KDH | Ohio | Anthem BCBS Ohio |
| KDI | California | Blue-Shield of California |
| KDJ | New Jersey | Horizon BCBS New Jersey |
| KDK | Tennessee | BCBS Tennessee |
| KDL | Kansas City | BCBS Kansas City |
| KDM | Massachusetts | BCBS Massachusetts |
| KDN | Wisconsin | Anthem BCBS Wisconsin |
| KDO | Michigan | BCBS Michigan |
| KDP | New Jersey | Horizon BCBS New Jersey |
| KDQ | New Jersey | Horizon BCBS New Jersey |
| KDR | Pennsylvania | Highmark BCBS Pennsylvania |
| KDS | N/A | Not Assigned |
| KDT | Massachusetts | BCBS Massachusetts |
| KDU | Vermont | BCBS Vermont |
| KDV | Georgia | Anthem BCBS Georgia |
| KDW | Kansas City | BCBS Kansas City |
| KDX | New York | Empire BCBS New York |
| KDY | N/A | Not Assigned |
| KDZ | N/A | Not Assigned |
| KEA | Iowa, South Dakota | Wellmark BCBS |
| KEB | California | Anthem Blue-Cross |
| KEC | New Jersey | Horizon BCBS New Jersey |
| KED | Illinois | BCBS Illinois |
| KEE | Idaho | Blue-Cross of Idaho |
| KEF | Indiana | Anthem BCBS Indiana |
| KEG | N/A | Not Assigned |
| KEH | District of Columbia, Maryland, Northern Virginia | Carefirst BCBS |
| KEI | Michigan | BCBS Michigan |
| KEJ | N/A | Not Assigned |
| KEK | California | Anthem Blue-Cross |
| KEL | N/A | Not Assigned |
| KEM | South Carolina | BCBS South Carolina |
| KEN | N/A | Not Assigned |
| KEO | Iowa, South Dakota | Wellmark BCBS |
| KEP | Illinois | BCBS Illinois |
| KEQ | Pennsylvania | Highmark BCBS Pennsylvania |
| KER | Oregon/Idaho/Utah/Washington | Regence BCBS |
| KES | Wisconsin | Anthem BCBS Wisconsin |
| KET | District of Columbia, Maryland, Northern Virginia | Carefirst BCBS |
| KEU | District of Columbia, Maryland, Northern Virginia | Carefirst BCBS |
| KEV | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| KEW | Michigan | BCBS Michigan |
| KEX | Illinois | BCBS Illinois |
| KEY | N/A | Not Assigned |
| KEZ | Connecticut | Anthem BCBS Connecticut |
| KFA | Western New York | BCBS Western New York |
| KFB | Oregon/Idaho/Utah/Washington | Regence BCBS |
| KFC | Illinois | BCBS Illinois |
| KFD | California | Blue-Shield of California |
| KFE | N/A | Not Assigned |
| KFF | N/A | Not Assigned |
| KFG | N/A | Not Assigned |
| KFH | Nebraska | BCBS Nebraska |
| KFI | N/A | Not Assigned |
| KFJ | New Hampshire | Anthem BCBS New Hampshire |
| KFK | Alabama | BCBS Alabama |
| KFL | South Carolina | BCBS South Carolina |
| KFM BCBS Prefix | Georgia | Anthem BCBS Georgia |
| KFN | N/A | Not Assigned |
| KFO | California | Anthem Blue-Cross |
| KFP | California | Blue-Shield of California |
| KFQ | Ohio | Anthem BCBS Ohio |
| KFR | Georgia | Anthem BCBS Georgia |
| KFS | N/A | Not Assigned |
| KFT | N/A | Not Assigned |
| KFU | New Hampshire | Anthem BCBS New Hampshire |
| KFV | Indiana | Anthem BCBS Indiana |
| KFW | N/A | Not Assigned |
| KFX | N/A | Not Assigned |
| KFY | Alaska | Premera BCBS Alaska |
| KFZ | N/A | Not Assigned |
| KGA | Florida | Florida-Blue |
| KGB | South Carolina | BCBS South Carolina |
| KGC | Florida | Florida-Blue |
| KGD | California | Anthem Blue-Cross |
| KGE | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| KGF | California | Anthem Blue-Cross |
| KGG | Ohio | Anthem BCBS Ohio |
| KGH | N/A | Not Assigned |
| KGI | District of Columbia, Maryland, Northern Virginia | Carefirst BCBS |
| KGJ | South Carolina | BCBS South Carolina |
| KGK | Ohio | Anthem BCBS Ohio |
| KGL | Nevada | Anthem BCBS Nevada |
| KGM | Arizona | BCBS Arizona |
| KGN | Texas | BCBS Texas |
| KGO | California | Blue-Shield of California |
| KGP | District of Columbia, Maryland, Northern Virginia | Carefirst BCBS |
| KGQ | District of Columbia, Maryland, Northern Virginia | Carefirst BCBS |
| KGR | Ohio | Anthem BCBS Ohio |
| KGS | Kansas | BCBS Kansas |
| KGT | Ohio | Anthem BCBS Ohio |
| KGU | Illinois | BCBS Illinois |
| KGV | Ohio | Anthem BCBS Ohio |
| KGW | California | Anthem Blue-Cross |
| KGX | Virginia | Anthem BCBS Virginia |
| KGY | Iowa, South Dakota | Wellmark BCBS |
| KGZ | Ohio | Anthem BCBS Ohio |
| KHA | Illinois | BCBS Illinois |
| KHB | Alabama | BCBS Alabama |
| KHC | Pennsylvania | Highmark BCBS Pennsylvania |
| KHD | Iowa, South Dakota | Wellmark BCBS |
| KHE | Wisconsin | Anthem BCBS Wisconsin |
| KHF | South Carolina | BCBS South Carolina |
| KHG | California | Blue-Shield of California |
| KHH | Alabama | BCBS Alabama |
| KHI | Georgia | Anthem BCBS Georgia |
| KHJ | Wisconsin | Anthem BCBS Wisconsin |
| KHK | N/A | Not Assigned |
| KHL | Wisconsin | Anthem BCBS Wisconsin |
| KHM | South Carolina | BCBS South Carolina |
| KHN | Wisconsin | Anthem BCBS Wisconsin |
| KHO | Idaho | Blue-Cross of Idaho |
| KHP | Ohio | Anthem BCBS Ohio |
| KHQ | N/A | Not Assigned |
| KHR | N/A | Not Assigned |
| KHS | Alaska | Premera BCBS Alaska |
| KHT | Minnesota | BCBS Minnesota |
| KHU | N/A | Not Assigned |
| KHV | Georgia | Anthem BCBS Georgia |
| KHW | N/A | Not Assigned |
| KHX | Wisconsin | Anthem BCBS Wisconsin |
| KHY | Wisconsin | Anthem BCBS Wisconsin |
| KHZ | Iowa, South Dakota | Wellmark BCBS |
| KIA | Georgia | Anthem BCBS Georgia |
| KIB | Indiana | Anthem BCBS Indiana |
| KIC | N/A | Not Assigned |
| KID | Alabama | BCBS Alabama |
| KIE | N/A | Not Assigned |
| KIF | Alabama | BCBS Alabama |
| KIG | New York | Empire BCBS New York |
| KIH | New York | Empire BCBS New York |
| KII | N/A | Not Assigned |
| KIJ | N/A | Not Assigned |
| KIK | Illinois | BCBS Illinois |
| KIL | N/A | Not Assigned |
| KIM | Western New York | BCBS Western New York |
| KIN | Oregon/Idaho/Utah/Washington | Regence BCBS |
| KIO | New York | Empire BCBS New York |
| KIP | N/A | Not Assigned |
| KIQ | N/A | Not Assigned |
| KIR | Oregon/Idaho/Utah/Washington | Regence BCBS |
| KIS | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| KIT | Illinois | BCBS Illinois |
| KIU | Alabama | BCBS Alabama |
| KIV | N/A | Not Assigned |
| KIW | N/A | Not Assigned |
| KIX | California | Blue-Shield of California |
| KIY | Western New York | BCBS Western New York |
| KIZ | California | Anthem Blue-Cross |
| KJA | N/A | Not Assigned |
| KJB | District of Columbia, Maryland, Northern Virginia | Carefirst BCBS |
| KJC | South Carolina | BCBS South Carolina |
| KJD | Alabama | BCBS Alabama |
| KJE | N/A | Not Assigned |
| KJF | Illinois | BCBS Illinois |
| KJG | Illinois | BCBS Illinois |
| KJH | Illinois | BCBS Illinois |
| KJI | Missouri | Anthem BCBS Missouri |
| KJJ | District of Columbia, Maryland, Northern Virginia | Carefirst BCBS |
| KJK | N/A | Not Assigned |
| KJL | N/A | Not Assigned |
| KJM | N/A | Not Assigned |
| KJN | Missouri | Anthem BCBS Missouri |
| KJO | Ohio | Anthem BCBS Ohio |
| KJP | New Jersey | Horizon BCBS New Jersey |
| KJQ | Missouri | Anthem BCBS Missouri |
| KJR | N/A | Not Assigned |
| KJS | South Carolina | BCBS South Carolina |
| KJT | N/A | Not Assigned |
| KJU | Missouri | Anthem BCBS Missouri |
| KJV | New York | Empire BCBS New York |
| KJW | Illinois | BCBS Illinois |
| KJX | Western New York | BCBS Western New York |
| KJY | N/A | Not Assigned |
| KJZ | N/A | Not Assigned |
| KKA | Alabama | BCBS Alabama |
| KKB | Georgia | Anthem BCBS Georgia |
| KKC | Michigan | BCBS Michigan |
| KKD | Georgia | Anthem BCBS Georgia |
| KKE | Oklahoma | BCBS Oklahoma |
| KKF | Georgia | Anthem BCBS Georgia |
| KKG | N/A | Not Assigned |
| KKH | Illinois | BCBS Illinois |
| KKI | California | Anthem Blue-Cross |
| KKJ | Texas | BCBS Texas |
| KKK | N/A | Not Assigned |
| KKL | Iowa, South Dakota | Wellmark BCBS |
| KKM | Georgia | Anthem BCBS Georgia |
| KKN | New Jersey | Horizon BCBS New Jersey |
| KKO | Michigan | BCBS Michigan |
| KKP | Illinois | BCBS Illinois |
| KKQ | N/A | Not Assigned |
| KKR | Michigan | BCBS Michigan |
| KKS | Iowa, South Dakota | Wellmark BCBS |
| KKT | Kentucky | Anthem BCBS Kentucky |
| KKU | Minnesota | BCBS Minnesota |
| KKV | Kentucky | Anthem BCBS Kentucky |
| KKW | California | Anthem Blue-Cross |
| KKX | Nebraska | BCBS Nebraska |
| KKY | N/A | Not Assigned |
| KKZ | N/A | Not Assigned |
| KLA | N/A | Not Assigned |
| KLB | Ohio | Anthem BCBS Ohio |
| KLC | N/A | Not Assigned |
| KLD | District of Columbia, Maryland, Northern Virginia | Carefirst BCBS |
| KLE | Ohio | Anthem BCBS Ohio |
| KLF | District of Columbia, Maryland, Northern Virginia | Carefirst BCBS |
| KLG | Michigan | BCBS Michigan |
| KLH | Nebraska | BCBS Nebraska |
| KLI | Georgia | Anthem BCBS Georgia |
| KLJ | N/A | Not Assigned |
| KLK | Virginia | Anthem BCBS Virginia |
| KLL | New York | Empire BCBS New York |
| KLM | Michigan | BCBS Michigan |
| KLN | Michigan | BCBS Michigan |
| KLO | New York | Empire BCBS New York |
| KLP | Michigan | BCBS Michigan |
| KLQ | California | Anthem Blue-Cross |
| KLR | Virginia | Anthem BCBS Virginia |
| KLS | Minnesota | BCBS Minnesota |
| KLT | Illinois | BCBS Illinois |
| KLU | N/A | Not Assigned |
| KLV | Western New York | BCBS Western New York |
| KLW | California | Anthem Blue-Cross |
| KLX | New Jersey | Horizon BCBS New Jersey |
| KLY | California | Anthem Blue-Cross |
| KLZ | Alaska | Premera BCBS Alaska |
| KMA | California | Blue-Shield of California |
| KMB | Wisconsin | Anthem BCBS Wisconsin |
| KMC | N/A | Not Assigned |
| KMD | Pennsylvania | Highmark BCBS Pennsylvania |
| KME | Iowa, South Dakota | Wellmark BCBS |
| KMF | Florida | Florida-Blue |
| KMG | New York (Northeastern) | Blue-Shield of Northeastern New York |
| KMH | Florida | Florida-Blue |
| KMI | N/A | Not Assigned |
| KMJ | New York | Empire BCBS New York |
| KMK | Illinois | BCBS Illinois |
| KML | N/A | Not Assigned |
| KMM | Pennsylvania | Highmark BCBS Pennsylvania |
| KMN | Pennsylvania | Highmark BCBS Pennsylvania |
| KMO | California | Blue-Shield of California |
| KMP | Nebraska | BCBS Nebraska |
| KMQ | Idaho | Blue-Cross of Idaho |
| KMR | Iowa, South Dakota | Wellmark BCBS |
| KMS | Kansas City | BCBS Kansas City |
| KMT | Michigan | BCBS Michigan |
| KMU | Michigan | BCBS Michigan |
| KMV | Maine | Anthem BCBS Maine |
| KMW | South Carolina | BCBS South Carolina |
| KMX | Maine | Anthem BCBS Maine |
| KMY | New York | Empire BCBS New York |
| KMZ | Ohio | Anthem BCBS Ohio |
| KNA | Ohio | Anthem BCBS Ohio |
| KNB | Pennsylvania | Highmark BCBS Pennsylvania |
| KNC | Ohio | Anthem BCBS Ohio |
| KND | Ohio | Anthem BCBS Ohio |
| KNE | Illinois | BCBS Illinois |
| KNF | N/A | Not Assigned |
| KNG | Iowa, South Dakota | Wellmark BCBS |
| KNH | N/A | Not Assigned |
| KNI | Missouri | Anthem BCBS Missouri |
| KNJ | California | Blue-Shield of California |
| KNK | Georgia | Anthem BCBS Georgia |
| KNL | Georgia | Anthem BCBS Georgia |
| KNM | N/A | Not Assigned |
| KNN | New York | Empire BCBS New York |
| KNO | Wisconsin | Anthem BCBS Wisconsin |
| KNP | Texas | BCBS Texas |
| KNQ | California | Anthem Blue-Cross |
| KNR | California | Anthem Blue-Cross |
| KNS | Illinois | BCBS Illinois |
| KNT | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| KNU | Ohio | Anthem BCBS Ohio |
| KNV | District of Columbia, Maryland, Northern Virginia | Carefirst BCBS |
| KNW | Iowa, South Dakota | Wellmark BCBS |
| KNX | Tennessee | BCBS Tennessee |
| KNY | Western New York | BCBS Western New York |
| KNZ | North Carolina | BCBS North Carolina |
| KOA | Western New York | BCBS Western New York |
| KOB | California | Blue-Shield of California |
| KOC | Massachusetts | BCBS Massachusetts |
| KOD | N/A | Not Assigned |
| KOE | N/A | Not Assigned |
| KOF | Iowa, South Dakota | Wellmark BCBS |
| KOG | N/A | Not Assigned |
| KOH | N/A | Not Assigned |
| KOI | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| KOJ | Michigan | BCBS Michigan |
| KOK | N/A | Not Assigned |
| KOL | Ohio | Anthem BCBS Ohio |
| KOM | Illinois | BCBS Illinois |
| KON | Illinois | BCBS Illinois |
| KOO | Idaho | Blue-Cross of Idaho |
| KOP | Wisconsin | Anthem BCBS Wisconsin |
| KOQ | Ohio | Anthem BCBS Ohio |
| KOR | Michigan | BCBS Michigan |
| KOS | N/A | Not Assigned |
| KOT | Western New York | BCBS Western New York |
| KOU | Michigan | BCBS Michigan |
| KOV | Georgia | Anthem BCBS Georgia |
| KOW | Georgia | Anthem BCBS Georgia |
| KOX | Idaho | Blue-Cross of Idaho |
| KOY | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| KOZ | Michigan | BCBS Michigan |
| KPA | Ohio | Anthem BCBS Ohio |
| KPB | N/A | Not Assigned |
| KPC | California | Anthem Blue-Cross |
| KPD | Virginia | Anthem BCBS Virginia |
| KPE | Georgia | Anthem BCBS Georgia |
| KPF | Oregon/Idaho/Utah/Washington | Regence BCBS |
| KPG | Ohio | Anthem BCBS Ohio |
| KPH | New Jersey | Horizon BCBS New Jersey |
| KPI | California | Blue-Shield of California |
| KPJ | Illinois | BCBS Illinois |
| KPK | Texas | BCBS Texas |
| KPL | N/A | Not Assigned |
| KPM | Kansas City | BCBS Kansas City |
| KPN | N/A | Not Assigned |
| KPO | California | Blue-Shield of California |
| KPP | Virginia | Anthem BCBS Virginia |
| KPQ | N/A | Not Assigned |
| KPR | N/A | Not Assigned |
| KPS | Kentucky | Anthem BCBS Kentucky |
| KPT | Minnesota | BCBS Minnesota |
| KPU | New Jersey | Horizon BCBS New Jersey |
| KPV | N/A | Not Assigned |
| KPW | Wisconsin | Anthem BCBS Wisconsin |
| KPX | Wisconsin | Anthem BCBS Wisconsin |
| KPY | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| KPZ | Wisconsin | Anthem BCBS Wisconsin |
| KQA | Iowa, South Dakota | Wellmark BCBS |
| KQB | Ohio | Anthem BCBS Ohio |
| KQC | California | Blue-Shield of California |
| KQD | New Jersey | Horizon BCBS New Jersey |
| KQE | N/A | Not Assigned |
| KQF | Massachusetts | BCBS Massachusetts |
| KQG | Alabama | BCBS Alabama |
| KQH | Iowa, South Dakota | Wellmark BCBS |
| KQI | Rhode Island | BCBS Rhode Island |
| KQJ | North Carolina | BCBS North Carolina |
| KQK | Alaska | Premera BCBS Alaska |
| KQL | New Jersey | Horizon BCBS New Jersey |
| KQM | New Jersey | Horizon BCBS New Jersey |
| KQN | Texas | BCBS Texas |
| KQO | Michigan | BCBS Michigan |
| KQP | Wisconsin | Anthem BCBS Wisconsin |
| KQQ | Western New York | BCBS Western New York |
| KQR | Wisconsin | Anthem BCBS Wisconsin |
| KQS | New Jersey | Horizon BCBS New Jersey |
| KQT | Oregon/Idaho/Utah/Washington | Regence BCBS |
| KQU | Alaska | Premera BCBS Alaska |
| KQV | N/A | Not Assigned |
| KQW | Michigan | BCBS Michigan |
| KQX | N/A | Not Assigned |
| KQY | N/A | Not Assigned |
| KQZ | N/A | Not Assigned |
| KRA | California | Anthem Blue-Cross |
| KRB | New York | Empire BCBS New York |
| KRC | Iowa, South Dakota | Wellmark BCBS |
| KRD | Iowa, South Dakota | Wellmark BCBS |
| KRE | Ohio | Anthem BCBS Ohio |
| KRF | N/A | Not Assigned |
| KRG | N/A | Not Assigned |
| KRH | Iowa, South Dakota | Wellmark BCBS |
| KRI | Michigan | BCBS Michigan |
| KRJ | Iowa, South Dakota | Wellmark BCBS |
| KRK | N/A | Not Assigned |
| KRL | N/A | Not Assigned |
| KRM | N/A | Not Assigned |
| KRN | Missouri | Anthem BCBS Missouri |
| KRO | Ohio | Anthem BCBS Ohio |
| KRP | Illinois | BCBS Illinois |
| KRQ | N/A | Not Assigned |
| KRR | Illinois | BCBS Illinois |
| KRS | N/A | Not Assigned |
| KRT | N/A | Not Assigned |
| KRU | Ohio | Anthem BCBS Ohio |
| KRV | N/A | Not Assigned |
| KRW | Ohio | Anthem BCBS Ohio |
| KRX | Wisconsin | Anthem BCBS Wisconsin |
| KRY | N/A | Not Assigned |
| KRZ | California | Anthem Blue-Cross |
| KSA | Kansas | BCBS Kansas |
| KSB | Oregon/Idaho/Utah/Washington | Regence BCBS |
| KSC | Michigan | BCBS Michigan |
| KSD | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| KSE | Kansas | BCBS Kansas |
| KSF | N/A | Not Assigned |
| KSG | Ohio | Anthem BCBS Ohio |
| KSH | N/A | Not Assigned |
| KSI | N/A | Not Assigned |
| KSJ | Kansas City | BCBS Kansas City |
| KSK | Texas | BCBS Texas |
| KSL | Massachusetts | BCBS Massachusetts |
| KSM | Massachusetts | BCBS Massachusetts |
| KSN | New York | Empire BCBS New York |
| KSO | Massachusetts | BCBS Massachusetts |
| KSP | Michigan | BCBS Michigan |
| KSQ | Texas | BCBS Texas |
| KSR | District of Columbia, Maryland, Northern Virginia | Carefirst BCBS |
| KSS | Texas | BCBS Texas |
| KST | Arizona | BCBS Arizona |
| KSU | N/A | Not Assigned |
| KSV | N/A | Not Assigned |
| KSW | Tennessee | BCBS Tennessee |
| KSX | Georgia | Anthem BCBS Georgia |
| KSY | N/A | Not Assigned |
| KSZ | Tennessee | BCBS Tennessee |
| KTA | California | Anthem Blue-Cross |
| KTB | Iowa, South Dakota | Wellmark BCBS |
| KTC | Pennsylvania | Highmark BCBS Pennsylvania |
| KTD | Kentucky | Anthem BCBS Kentucky |
| KTE | Western New York | BCBS Western New York |
| KTF | California | Blue-Shield of California |
| KTG | Wisconsin | Anthem BCBS Wisconsin |
| KTH | Illinois | BCBS Illinois |
| KTI | California | Blue-Shield of California |
| KTJ | Illinois | BCBS Illinois |
| KTK | Nebraska | BCBS Nebraska |
| KTL | Iowa, South Dakota | Wellmark BCBS |
| KTM | N/A | Not Assigned |
| KTN | Alaska | Premera BCBS Alaska |
| KTO | Arizona | BCBS Arizona |
| KTP | California | Blue-Shield of California |
| KTQ | Alaska | Premera BCBS Alaska |
| KTR | Virginia | Anthem BCBS Virginia |
| KTS | Ohio | Anthem BCBS Ohio |
| KTT | Georgia | Anthem BCBS Georgia |
| KTU | Illinois | BCBS Illinois |
| KTV | Illinois | BCBS Illinois |
| KTW | Georgia | Anthem BCBS Georgia |
| KTX | Georgia | Anthem BCBS Georgia |
| KTY | Vermont | BCBS Vermont |
| KTZ | Texas | BCBS Texas |
| KUA | N/A | Not Assigned |
| KUB | Tennessee | BCBS Tennessee |
| KUC | Illinois | BCBS Illinois |
| KUD | N/A | Not Assigned |
| KUE | California | Blue-Shield of California |
| KUF | Iowa, South Dakota | Wellmark BCBS |
| KUG | New Jersey | Horizon BCBS New Jersey |
| KUH | N/A | Not Assigned |
| KUI | Michigan | BCBS Michigan |
| KUJ | Ohio | Anthem BCBS Ohio |
| KUK | New Jersey | Horizon BCBS New Jersey |
| KUL | Illinois | BCBS Illinois |
| KUM | Arkansas | Arkansas BCBS |
| KUN | N/A | Not Assigned |
| KUO | Michigan | BCBS Michigan |
| KUP | Rhode Island | BCBS Rhode Island |
| KUQ | N/A | Not Assigned |
| KUR | Illinois | BCBS Illinois |
| KUS | South Carolina | BCBS South Carolina |
| KUT | North Carolina | BCBS North Carolina |
| KUU | Ohio | Anthem BCBS Ohio |
| KUV | Nevada | Anthem BCBS Nevada |
| KUW | Illinois | BCBS Illinois |
| KUX | N/A | Not Assigned |
| KUY | N/A | Not Assigned |
| KUZ | N/A | Not Assigned |
| KVA | Illinois | BCBS Illinois |
| KVB | Alabama | BCBS Alabama |
| KVC | Iowa, South Dakota | Wellmark BCBS |
| KVD | Alabama | BCBS Alabama |
| KVE | N/A | Not Assigned |
| KVF | Iowa, South Dakota | Wellmark BCBS |
| KVG | Minnesota | BCBS Minnesota |
| KVH | N/A | Not Assigned |
| KVI | Tennessee | BCBS Tennessee |
| KVJ | N/A | Not Assigned |
| KVK | California | Anthem Blue-Cross |
| KVL | Kansas City | BCBS Kansas City |
| KVM | N/A | Not Assigned |
| KVN | N/A | Not Assigned |
| KVO | Minnesota | BCBS Minnesota |
| KVP | N/A | Not Assigned |
| KVQ | Iowa, South Dakota | Wellmark BCBS |
| KVR | N/A | Not Assigned |
| KVS | Alaska | Premera BCBS Alaska |
| KVT | Pennsylvania | Highmark BCBS Pennsylvania |
| KVU | N/A | Not Assigned |
| KVV | N/A | Not Assigned |
| KVW | Wisconsin | Anthem BCBS Wisconsin |
| KVX | Massachusetts | BCBS Massachusetts |
| KVY | California | Anthem Blue-Cross |
| KVZ | Ohio | Anthem BCBS Ohio |
| KWA | Michigan | BCBS Michigan |
| KWB | South Carolina | BCBS South Carolina |
| KWC | N/A | Not Assigned |
| KWD | California | Anthem Blue-Cross |
| KWE | Illinois | BCBS Illinois |
| KWF | Kansas City | BCBS Kansas City |
| KWG | Iowa, South Dakota | Wellmark BCBS |
| KWH | New Jersey | Horizon BCBS New Jersey |
| KWI | California | Anthem Blue-Cross |
| KWJ | N/A | Not Assigned |
| KWK | Iowa, South Dakota | Wellmark BCBS |
| KWL | N/A | Not Assigned |
| KWM | Indiana | Anthem BCBS Indiana |
| KWN | California | Anthem Blue-Cross |
| KWO | Michigan | BCBS Michigan |
| KWP | Massachusetts | BCBS Massachusetts |
| KWQ | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| KWR | Illinois | BCBS Illinois |
| KWS | N/A | Not Assigned |
| KWT | California | Anthem Blue-Cross |
| KWU | California | Anthem Blue-Cross |
| KWV | Oregon/Idaho/Utah/Washington | Regence BCBS |
| KWW | District of Columbia, Maryland, Northern Virginia | Carefirst BCBS |
| KWX | Oregon/Idaho/Utah/Washington | Regence BCBS |
| KWY | New York (Northeastern) | Blue-Shield of Northeastern New York |
| KWZ | Nebraska | BCBS Nebraska |
| KXA | Western New York | BCBS Western New York |
| KXB | N/A | Not Assigned |
| KXC | Illinois | BCBS Illinois |
| KXD | Western New York | BCBS Western New York |
| KXE | Illinois | BCBS Illinois |
| KXF | New York (Northeastern) | Blue-Shield of Northeastern New York |
| KXG | Massachusetts | BCBS Massachusetts |
| KXH | N/A | Not Assigned |
| KXI | California | Anthem Blue-Cross |
| KXJ | California | Anthem Blue-Cross |
| KXK | Florida | Florida-Blue |
| KXL | Wisconsin | Anthem BCBS Wisconsin |
| KXM | Alaska | Premera BCBS Alaska |
| KXN | N/A | Not Assigned |
| KXO | Michigan | BCBS Michigan |
| KXP | Minnesota | BCBS Minnesota |
| KXQ | Missouri | Anthem BCBS Missouri |
| KXR | Alaska | Premera BCBS Alaska |
| KXS | Iowa, South Dakota | Wellmark BCBS |
| KXT | Ohio | Anthem BCBS Ohio |
| KXU | Virginia | Anthem BCBS Virginia |
| KXV | Minnesota | BCBS Minnesota |
| KXW | Illinois | BCBS Illinois |
| KXX | Iowa, South Dakota | Wellmark BCBS |
| KXY | District of Columbia, Maryland, Northern Virginia | Carefirst BCBS |
| KXZ | N/A | Not Assigned |
| KYA | Michigan | BCBS Michigan |
| KYB | N/A | Not Assigned |
| KYC | Ohio | Anthem BCBS Ohio |
| KYD | Michigan | BCBS Michigan |
| KYE | Iowa, South Dakota | Wellmark BCBS |
| KYF | Illinois | BCBS Illinois |
| KYG | Ohio | Anthem BCBS Ohio |
| KYH | Ohio | Anthem BCBS Ohio |
| KYI | Alabama | BCBS Alabama |
| KYJ | Ohio | Anthem BCBS Ohio |
| KYK | Michigan | BCBS Michigan |
| KYL | Kentucky | Anthem BCBS Kentucky |
| KYM | N/A | Not Assigned |
| KYN | N/A | Not Assigned |
| KYO | Michigan | BCBS Michigan |
| KYP | N/A | Not Assigned |
| KYQ | N/A | Not Assigned |
| KYR | California | Anthem Blue-Cross |
| KYS | New York | Empire BCBS New York |
| KYT | Kentucky | Anthem BCBS Kentucky |
| KYU | Ohio | Anthem BCBS Ohio |
| KYV | N/A | Not Assigned |
| KYW | Ohio | Anthem BCBS Ohio |
| KYX | Alabama | BCBS Alabama |
| KYY | Florida | Florida-Blue |
| KYZ | District of Columbia, Maryland, Northern Virginia | Carefirst BCBS |
| KZA | N/A | Not Assigned |
| KZB | Ohio | Anthem BCBS Ohio |
| KZC | Alabama | BCBS Alabama |
| KZD | California | Anthem Blue-Cross |
| KZE | Iowa, South Dakota | Wellmark BCBS |
| KZF | Western New York | BCBS Western New York |
| KZG | North Carolina | BCBS North Carolina |
| KZH | Illinois | BCBS Illinois |
| KZI | Ohio | Anthem BCBS Ohio |
| KZJ | N/A | Not Assigned |
| KZK | District of Columbia, Maryland, Northern Virginia | Carefirst BCBS |
| KZL | Wisconsin | Anthem BCBS Wisconsin |
| KZM | N/A | Not Assigned |
| KZN | Texas | BCBS Texas |
| KZO | Michigan | BCBS Michigan |
| KZP | Virginia | Anthem BCBS Virginia |
| KZQ | Western New York | BCBS Western New York |
| KZR | New Jersey | Horizon BCBS New Jersey |
| KZS | Florida | Florida-Blue |
| KZT | N/A | Not Assigned |
| KZU | California | Anthem Blue-Cross |
| KZV | District of Columbia, Maryland, Northern Virginia | Carefirst BCBS |
| KZW | N/A | Not Assigned |
| KZX | Illinois | BCBS Illinois |
| KZY | Michigan | BCBS Michigan |
| KZZ | Georgia | Anthem BCBS Georgia |
