| HAA | Horizon Blue-Cross Blue-Shield of New Jersey |
| HAB | Horizon Blue-Cross Blue-Shield of New Jersey |
| HAC | Horizon Blue-Cross Blue-Shield of New Jersey |
| HAD | CareFirst BCBS |
| HAE | Blue-Cross Blue-Shield of Massachusetts |
| HAF | Horizon Blue-Cross Blue-Shield of New Jersey |
| HAG | Blue Cross of California |
| HAH | Anthem BCBS of Ohio |
| HAI | Independence Blue Cross |
| HAJ | Independence Blue Cross |
| HAK | No Prefix Assigned |
| HAL | Blue-Cross Blue-Shield of Minnesota |
| HAM | Horizon Blue-Cross Blue-Shield of New Jersey |
| HAN | No Prefix Assigned |
| HAO | Blue-Cross Blue-Shield of Michigan |
| HAP | Blue-Cross Blue-Shield of Oklahoma |
| HAQ | Horizon Blue-Cross Blue-Shield of New Jersey |
| HAR | Regence Blue Shield of Idaho |
| HAS | Blue-Cross Blue-Shield of Massachusetts |
| HAT | Anthem BCBS of Ohio |
| HAU | Anthem BCBS of Nevada |
| HAV | Blue-Cross Blue-Shield of Illinois |
| HAW | Blue-Cross Blue-Shield of Michigan |
| HAX | Horizon Blue-Cross Blue-Shield of New Jersey |
| HAY | Blue-Cross Blue-Shield of Texas |
| HAZ | Horizon Blue-Cross Blue-Shield of New Jersey |
| HBA | Anthem BCBS of Connecticut |
| HBB | Blue-Cross Blue-Shield of Illinois |
| HBC | Highmark BCBS of Pennsylvania |
| HBD | Horizon Blue-Cross Blue-Shield of New Jersey |
| HBE | Highmark BCBS of Pennsylvania |
| HBF | Blue-Cross Blue-Shield of Georgia |
| HBG | CareFirst BCBS |
| HBH | Horizon Blue-Cross Blue-Shield of New Jersey |
| HBI | No Prefix Assigned |
| HBJ | Blue-Cross Blue-Shield of Arkansas |
| HBK | Horizon Blue-Cross Blue-Shield of New Jersey |
| HBL | Anthem BCBS of Missouri |
| HBM | Horizon Blue-Cross Blue-Shield of New Jersey |
| HBN | Blue-Cross Blue-Shield of Georgia |
| HBO | Regence Blue-Cross Blue-Shield of Oregon |
| HBP | Blue-Cross Blue-Shield of Minnesota |
| HBQ | Blue Cross of California |
| HBR | Blue-Cross Blue-Shield of Massachusetts |
| HBS | Blue-Cross Blue-Shield of Arkansas |
| HBT | Blue-Cross Blue-Shield of Texas |
| HBU | Blue-Cross Blue-Shield of Georgia |
| HBV | Blue Cross of California |
| HBW | Blue-Cross Blue-Shield of North Carolina |
| HBX | Horizon Blue-Cross Blue-Shield of New Jersey |
| HBY | Horizon Blue-Cross Blue-Shield of New Jersey |
| HBZ | Blue-Cross Blue-Shield of Arkansas |
| HCA | Blue-Cross Blue-Shield of Minnesota |
| HCB | Blue-Cross Blue-Shield of Texas |
| HCC | CareFirst BCBS |
| HCD | Horizon Blue-Cross Blue-Shield of New Jersey |
| HCE | BCBS of Tennessee |
| HCF | Anthem BCBS of Wisconsin |
| HCG | Wellmark BCBS |
| HCH | CareFirst BCBS |
| HCI | Blue-Cross Blue-Shield of Nebraska |
| HCJ | Blue-Cross Blue-Shield of Illinois |
| HCK | Blue Cross of Idaho |
| HCL | Blue-Cross Blue-Shield of Illinois |
| HCM | Wellmark BCBS |
| HCN | Blue-Cross Blue-Shield of Massachusetts |
| HCO | Horizon Blue-Cross Blue-Shield of New Jersey |
| HCP | Independence Blue Cross |
| HCQ | No Prefix Assigned |
| HCR | BCBS of Tennessee |
| HCS | Regence Blue-Cross Blue-Shield of Oregon |
| HCT | Highmark BCBS of Pennsylvania |
| HCU | BCBS of Tennessee |
| HCV | Wellmark BCBS |
| HCW | Horizon Blue-Cross Blue-Shield of New Jersey |
| HCX | Anthem BCBS of Ohio |
| HCY | Anthem BCBS of Ohio |
| HCZ | Blue Cross of California |
| HDA | Regence Blue-Cross Blue-Shield of Oregon |
| HDB | Blue Cross of California |
| HDC | Blue-Cross Blue-Shield of Texas |
| HDD | Blue-Cross Blue-Shield of Minnesota |
| HDE | BCBS of Tennessee |
| HDF | Blue-Cross Blue-Shield of Illinois |
| HDG | Blue-Cross Blue-Shield of Mississippi |
| HDH | Wellmark BCBS |
| HDI | Blue Shield of California |
| HDJ | Blue Cross of California |
| HDK | Blue-Cross Blue-Shield of South Carolina |
| HDL | Blue Cross of California |
| HDM | Blue-Cross Blue-Shield of South Carolina |
| HDN | BCBS of Tennessee |
| HDO | Blue Cross of California |
| HDP | Blue Cross of California |
| HDQ | Blue Cross of California |
| HDR | Blue-Cross Blue-Shield of Nebraska |
| HDS | Blue Cross of California |
| HDT | Blue Cross of California |
| HDU | Blue Cross of California |
| HDV | Blue Cross of California |
| HDW | Blue Cross of California |
| HDX | Blue-Cross Blue-Shield of Alabama |
| HDY | Blue Cross of California |
| HDZ | Blue Shield of California |
| HEA | Blue Cross of California |
| HEB | Blue-Cross Blue-Shield of Texas |
| HEC | Highmark BCBS of Pennsylvania |
| HED | Horizon Blue-Cross Blue-Shield of New Jersey |
| HEE | Blue-Cross Blue-Shield of Illinois |
| HEF | Horizon Blue-Cross Blue-Shield of New Jersey |
| HEG | Blue-Cross Blue-Shield of Georgia |
| HEH | Blue-Cross Blue-Shield of Kansas |
| HEI | Blue-Cross Blue-Shield of Arkansas |
| HEJ | Blue-Cross Blue-Shield of South Carolina |
| HEK | BCBS of Michigan |
| HEL | Blue-Cross Blue-Shield of Texas |
| HEM | Highmark BCBS of Pennsylvania |
| HEN | Horizon Blue-Cross Blue-Shield of New Jersey |
| HEO | Blue Cross of California |
| HEP | Wellmark BCBS |
| HEQ | Blue-Cross Blue-Shield of Illinois |
| HER | CareFirst BCBS |
| HES | Blue-Cross Blue-Shield of Georgia |
| HET | Highmark BCBS of Pennsylvania |
| HEU | Blue-Cross Blue-Shield of Massachusetts |
| HEV | Wellmark BCBS |
| HEW | No Prefix Assigned |
| HEX | Blue Cross of California |
| HEY | Blue-Cross Blue-Shield of Illinois |
| HEZ | Blue-Cross Blue-Shield of Illinois |
| HFA | Blue-Cross Blue-Shield of Illinois |
| HFB | Anthem BCBS of Missouri |
| HFC | Blue-Cross Blue-Shield of Massachusetts |
| HFD | Blue-Cross Blue-Shield of Nebraska |
| HFE | Anthem BCBS of New Hampshire |
| HFF | Blue Cross of California |
| HFG | No Prefix Assigned |
| HFH | Highmark BCBS of Pennsylvania |
| HFI | Blue-Cross Blue-Shield of South Carolina |
| HFJ | Anthem BCBS of Wisconsin |
| HFK | CareFirst BCBS |
| HFL | Regence Blue Shield of Washington |
| HFM | Horizon Blue-Cross Blue-Shield of New Jersey |
| HFN | Blue-Cross Blue-Shield of Minnesota |
| HFO | BCBS of Tennessee |
| HFP | Blue-Cross Blue-Shield of Hawaii |
| HFQ | Blue-Cross Blue-Shield of Georgia |
| HFR | Horizon Blue-Cross Blue-Shield of New Jersey |
| HFS | Blue Cross of California |
| HFT | Regence Blue Shield of Washington |
| HFU | Blue-Cross Blue-Shield of Georgia |
| HFV | Blue-Cross Blue-Shield of Georgia |
| HFW | Horizon Blue-Cross Blue-Shield of New Jersey |
| HFX | Blue-Cross Blue-Shield of Minnesota |
| HFY | Blue-Cross Blue-Shield of Georgia |
| HFZ | Anthem BCBS of Ohio |
| HGA | Blue-Cross Blue-Shield of Massachusetts |
| HGB | CareFirst BCBS |
| HGC | No Prefix Assigned |
| HGD | Blue-Cross Blue-Shield of Texas |
| HGE | Blue-Cross Blue-Shield of Minnesota |
| HGF | Wellmark BCBS |
| HGG | Wellmark BCBS |
| HGH | Capital BlueCross |
| HGI | No Prefix Assigned |
| HGJ | CareFirst BCBS |
| HGK | Blue-Cross Blue-Shield of Georgia |
| HGL | No Prefix Assigned |
| HGM | Wellmark BCBS |
| HGN | No Prefix Assigned |
| HGO | Regence Blue Shield of Washington |
| HGP | Wellmark BCBS |
| HGQ | Blue-Cross Blue-Shield of Michigan |
| HGR | Blue-Cross Blue-Shield of Alabama |
| HGS | Horizon Blue-Cross Blue-Shield of New Jersey |
| HGT | CareFirst BCBS |
| HGU | No Prefix Assigned |
| HGV | No Prefix Assigned |
| HGW | Blue Cross of California |
| HGX | Highmark BCBS of Pennsylvania |
| HGY | CareFirst BCBS |
| HGZ | Highmark BCBS of Pennsylvania |
| HHA | No Prefix Assigned |
| HHB | Empire Blue-Cross Blue-Shield |
| HHC | Anthem BCBS of Connecticut |
| HHD | Wellmark BCBS |
| HHE | Anthem BCBS of Connecticut |
| HHF | Wellmark BCBS |
| HHG | Blue-Cross Blue-Shield of Wisconsin |
| HHH | Anthem BCBS of Kentucky |
| HHI | Wellmark BCBS |
| HHJ | Blue-Cross Blue-Shield of Michigan |
| HHK | Blue-Cross Blue-Shield of Texas |
| HHL | Blue-Cross Blue-Shield of Michigan |
| HHM | Blue-Cross Blue-Shield of South Carolina |
| HHN | Blue-Cross Blue-Shield of Alabama |
| HHO | Wellmark BCBS |
| HHP | Horizon Blue-Cross Blue-Shield of New Jersey |
| HHQ | Wellmark BCBS |
| HHR | Anthem BCBS of Virginia |
| HHS | Blue Cross of Idaho |
| HHT | Anthem BCBS of Ohio |
| HHU | Blue-Cross Blue-Shield of Illinois |
| HHV | Blue-Cross Blue-Shield of Massachusetts |
| HHW | Horizon Blue-Cross Blue-Shield of New Jersey |
| HHX | Capital BlueCross |
| HHY | Blue-Cross Blue-Shield of Minnesota |
| HHZ | Blue-Cross Blue-Shield of South Carolina |
| HIA | No Prefix Assigned |
| HIB | Blue-Cross Blue-Shield of Alabama |
| HIC | No Prefix Assigned |
| HID | Blue Cross of California |
| HIE | Blue-Cross Blue-Shield of Massachusetts |
| HIF | Blue Cross of Idaho |
| HIG | Blue Shield of California |
| HIH | Wellmark BCBS |
| HII | Blue Shield of California |
| HIJ | Wellmark BCBS |
| HIK | Blue-Cross Blue-Shield of South Carolina |
| HIL | Blue-Cross Blue-Shield of South Carolina |
| HIM | Highmark BCBS of Pennsylvania |
| HIN | Blue-Cross Blue-Shield of Vermont |
| HIO | Blue-Cross Blue-Shield of Michigan |
| HIP | Highmark BCBS of Pennsylvania |
| HIQ | Blue Shield of California |
| HIR | Blue-Cross Blue-Shield of Minnesota |
| HIS | Blue-Cross Blue-Shield of Kansas City |
| HIT | Highmark BCBS of Pennsylvania |
| HIU | BCBS of Tennessee |
| HIV | Regence Blue-Cross Blue-Shield of Oregon |
| HIW | Blue-Cross Blue-Shield of Georgia |
| HIX | Blue-Cross Blue-Shield of South Carolina |
| HIY | Blue-Cross Blue-Shield of Georgia |
| HIZ | Regence Blue-Cross Blue-Shield of Oregon |
| HJA | Blue Cross of California |
| HJB | Anthem BCBS of Ohio |
| HJC | Blue-Cross Blue-Shield of Michigan |
| HJD | Blue-Cross Blue-Shield of Illinois |
| HJE | Blue-Cross Blue-Shield of Nebraska |
| HJF | Blue Cross of California |
| HJG | Highmark BCBS of Pennsylvania |
| HJH | Blue-Cross Blue-Shield of Illinois |
| HJI | Blue-Cross Blue-Shield of Michigan |
| HJJ | Blue-Cross Blue-Shield of Texas |
| HJK | Blue-Cross Blue-Shield of Texas |
| HJL | Blue-Cross Blue-Shield of Illinois |
| HJM | Blue Shield of California |
| HJN | Horizon Blue-Cross Blue-Shield of New Jersey |
| HJO | Anthem BCBS of Kentucky |
| HJP | Blue Shield of California |
| HJQ | Blue Shield of California |
| HJR | Highmark BCBS of Pennsylvania |
| HJS | CareFirst BCBS |
| HJT | CareFirst BCBS |
| HJU | Wellmark BCBS |
| HJV | Blue-Cross Blue-Shield of Alabama |
| HJW | Empire Blue-Cross Blue-Shield |
| HJX | Highmark BCBS of Pennsylvania |
| HJY | Blue-Cross Blue-Shield of Michigan |
| HJZ | Wellmark BCBS |
| HKA | CareFirst BCBS |
| HKB | Anthem BCBS of Virginia |
| HKC | Wellmark BCBS |
| HKD | Blue-Cross Blue-Shield of Michigan |
| HKE | Anthem BCBS of Kentucky |
| HKF | Wellmark BCBS |
| HKG | Anthem BCBS of Kentucky |
| HKH | Empire Blue-Cross Blue-Shield |
| HKI | Blue-Cross Blue-Shield of Michigan |
| HKJ | CareFirst BCBS |
| HKK | Anthem BCBS of Virginia |
| HKL | Blue-Cross Blue-Shield of Massachusetts |
| HKM | Blue-Cross Blue-Shield of Georgia |
| HKN | CareFirst BCBS |
| HKO | Blue Shield of California |
| HKP | Blue-Cross Blue-Shield of Michigan |
| HKQ | Anthem BCBS of Virginia |
| HKR | Blue-Cross Blue-Shield of Illinois |
| HKS | Regence Blue Shield of Washington |
| HKT | Wellmark BCBS |
| HKU | Blue-Cross Blue-Shield of Minnesota |
| HKV | Blue-Cross Blue-Shield of Illinois |
| HKW | CareFirst BCBS |
| HKX | No Prefix Assigned |
| HKY | CareFirst BCBS |
| HKZ | Independence Blue Cross |
| HLA | Anthem BCBS of Ohio |
| HLB | Anthem BCBS of Ohio |
| HLC | Premera Blue Cross |
| HLD | Premera Blue Cross |
| HLE | Blue Shield of California |
| HLF | Anthem BCBS of Missouri |
| HLG | Anthem BCBS of Ohio |
| HLH | Blue-Cross Blue-Shield of Texas |
| HLI | Blue Cross of Idaho |
| HLJ | Blue-Cross Blue-Shield of South Carolina |
| HLK | Anthem BCBS of Ohio |
| HLL | No Prefix Assigned |
| HLM | Horizon Blue-Cross Blue-Shield of New Jersey |
| HLN | Blue-Cross Blue-Shield of Illinois |
| HLO | Anthem BCBS of Missouri |
| HLP | Wellmark BCBS |
| HLQ | Anthem BCBS of Missouri |
| HLR | Horizon Blue-Cross Blue-Shield of New Jersey |
| HLS | Blue-Cross Blue-Shield of South Carolina |
| HLT | Blue-Cross Blue-Shield of Massachusetts |
| HLU | Premera Blue Cross |
| HLV | Blue-Cross Blue-Shield of Texas |
| HLW | Empire Blue-Cross Blue-Shield |
| HLX | Blue-Cross Blue-Shield of Massachusetts |
| HLY | Blue-Cross Blue-Shield of Texas |
| HLZ | Anthem BCBS of Ohio |
| HMA | Blue-Cross Blue-Shield of South Carolina |
| HMB | Horizon Blue-Cross Blue-Shield of New Jersey |
| HMC | Wellmark BCBS |
| HMD | Blue-Cross Blue-Shield of Alabama |
| HME | Blue-Cross Blue-Shield of Texas |
| HMF | Blue-Cross Blue-Shield of Nebraska |
| HMG | Blue-Cross Blue-Shield of Georgia |
| HMH | Anthem BCBS of Wisconsin |
| HMI | Blue-Cross Blue-Shield of Massachusetts |
| HMJ | CareFirst BCBS |
| HMK | Blue-Cross Blue-Shield of Nebraska |
| HML | Blue-Cross Blue-Shield of Alabama |
| HMM | Blue-Cross Blue-Shield of Georgia |
| HMN | Wellmark BCBS |
| HMO | Blue-Cross Blue-Shield of Arkansas |
| HMP | Wellmark BCBS |
| HMQ | Blue-Cross Blue-Shield of Minnesota |
| HMR | Excellus BCBS |
| HMS | Premera Blue Cross |
| HMT | Empire Blue-Cross Blue-Shield |
| HMU | Blue Cross of Idaho |
| HMV | Empire Blue-Cross Blue-Shield |
| HMW | Blue-Cross Blue-Shield of Georgia |
| HMX | Wellmark BCBS |
| HMY | Blue-Cross Blue-Shield of South Carolina |
| HMZ | Empire Blue-Cross Blue-Shield |
| HNA | Blue-Cross Blue-Shield of Alabama |
| HNB | No Prefix Assigned |
| HNC | Anthem BCBS of Ohio |
| HND | Regence Blue-Cross Blue-Shield of Oregon |
| HNE | Blue-Cross Blue-Shield of South Carolina |
| HNF | Blue-Cross Blue-Shield of Texas |
| HNG | Highmark BCBS of Pennsylvania |
| HNH | Blue Cross of California |
| HNI | Blue-Cross Blue-Shield of Massachusetts |
| HNJ | Highmark BCBS of Pennsylvania |
| HNK | Blue-Cross Blue-Shield of Massachusetts |
| HNL | Highmark BCBS of Pennsylvania |
| HNM | Anthem BCBS of Ohio |
| HNN | Highmark BCBS of Pennsylvania |
| HNO | Blue Shield of California |
| HNP | Anthem BCBS of Ohio |
| HNQ | Independence Blue Cross |
| HNR | Blue Cross of California |
| HNS | Anthem BCBS of Wisconsin |
| HNT | Blue-Cross Blue-Shield of Texas |
| HNU | Regence Blue Shield of Washington |
| HNV | Anthem BCBS of Ohio |
| HNW | Blue-Cross Blue-Shield of Georgia |
| HNX | Blue-Cross Blue-Shield of Michigan |
| HNY | Blue-Cross Blue-Shield of Michigan |
| HNZ | Blue-Cross Blue-Shield of Michigan |
| HOA | Blue-Cross Blue-Shield of Michigan |
| HOB | Blue-Cross Blue-Shield of Mississippi |
| HOC | Blue-Cross Blue-Shield of Georgia |
| HOD | Blue-Cross Blue-Shield of Georgia |
| HOE | Blue-Cross Blue-Shield of South Carolina |
| HOF | No Prefix Assigned |
| HOG | Independence Blue Cross |
| HOH | CareFirst BCBS |
| HOI | Blue Cross of Idaho |
| HOJ | Blue-Cross Blue-Shield of Massachusetts |
| HOK | CareFirst BCBS |
| HOL | Blue-Cross Blue-Shield of South Carolina |
| HOM | Blue-Cross Blue-Shield of Nebraska |
| HON | Wellmark BCBS |
| HOO | CareFirst BCBS |
| HOP | Premera Blue Cross |
| HOQ | Independence Blue Cross |
| HOR | Independence Blue Cross |
| HOS | Blue-Cross Blue-Shield of Massachusetts |
| HOT | Blue-Cross Blue-Shield of Massachusetts |
| HOU | Anthem BCBS of Ohio |
| HOV | Highmark BCBS of Pennsylvania |
| HOW | Blue-Cross Blue-Shield of Alabama |
| HOX | Blue-Cross Blue-Shield of Massachusetts |
| HOY | CareFirst BCBS |
| HOZ | CareFirst BCBS |
| HPA | Horizon Blue-Cross Blue-Shield of New Jersey |
| HPB | Anthem BCBS of Missouri |
| HPC | Blue-Cross Blue-Shield of South Carolina |
| HPD | Blue-Cross Blue-Shield of Massachusetts |
| HPE | Blue Cross of California |
| HPF | Horizon Blue-Cross Blue-Shield of New Jersey |
| HPG | Blue-Cross Blue-Shield of South Carolina |
| HPH | Anthem BCBS of Colorado |
| HPI | Capital BlueCross |
| HPJ | Blue-Cross Blue-Shield of Michigan |
| HPK | Blue Cross of California |
| HPL | Blue Cross of California |
| HPM | Blue Shield of California |
| HPN | Anthem BCBS of Virginia |
| HPO | Blue-Cross Blue-Shield of North Carolina |
| HPP | Blue-Cross Blue-Shield of Illinois |
| HPQ | Blue Cross of California |
| HPR | Horizon Blue-Cross Blue-Shield of New Jersey |
| HPS | CareFirst BCBS |
| HPT | Blue-Cross Blue-Shield of Oklahoma |
| HPU | Blue-Cross Blue-Shield of Illinois |
| HPV | Blue Cross of California |
| HPW | CareFirst BCBS |
| HPX | Blue-Cross Blue-Shield of Alabama |
| HPY | Empire Blue-Cross Blue-Shield |
| HPZ | Florida Blue |
| HQA | No Prefix Assigned |
| HQB | No Prefix Assigned |
| HQC | Blue-Cross Blue-Shield of Minnesota |
| HQD | Wellmark BCBS |
| HQE | Anthem BCBS of Missouri |
| HQF | Anthem BCBS of Ohio |
| HQG | Blue-Cross Blue-Shield of Georgia |
| HQH | Blue-Cross Blue-Shield of Kansas City |
| HQI | Blue-Cross Blue-Shield of North Carolina |
| HQJ | Blue-Cross Blue-Shield of Massachusetts |
| HQK | No Prefix Assigned |
| HQL | Anthem BCBS of Missouri |
| HQM | Blue-Cross Blue-Shield of South Carolina |
| HQN | Wellmark BCBS |
| HQO | BCBS of Western New York |
| HQP | Anthem BCBS of Missouri |
| HQQ | Regence Blue-Cross Blue-Shield of Oregon |
| HQR | BCBS of Western New York |
| HQS | Blue Shield of Northeastern New York |
| HQT | BCBS of Western New York |
| HQU | Blue-Cross Blue-Shield of Michigan |
| HQV | No Prefix Assigned |
| HQW | Regence Blue-Cross Blue-Shield of Utah |
| HQX | Blue Shield of Northeastern New York |
| HQY | Blue-Cross Blue-Shield of Illinois |
| HQZ | Blue-Cross Blue-Shield of Minnesota |
| HRA | BCBS of Tennessee |
| HRB | Horizon Blue-Cross Blue-Shield of New Jersey |
| HRC | Capital BlueCross |
| HRD | Wellmark BCBS |
| HRE | Blue-Cross Blue-Shield of Illinois |
| HRF | Highmark BCBS of Pennsylvania |
| HRG | Wellmark BCBS |
| HRH | Blue Cross of California |
| HRI | Blue-Cross Blue-Shield of Minnesota |
| HRJ | Blue Cross of California |
| HRK | Premera Blue Cross |
| HRL | Blue-Cross Blue-Shield of Minnesota |
| HRM | Highmark BCBS of Pennsylvania |
| HRN | Premera Blue Cross |
| HRO | Capital BlueCross |
| HRP | CareFirst BCBS |
| HRQ | Blue-Cross Blue-Shield of Minnesota |
| HRR | Blue-Cross Blue-Shield of Illinois |
| HRS | Premera Blue Cross |
| HRT | Highmark BCBS of Pennsylvania |
| HRU | BCBS of Western New York |
| HRV | Blue-Cross Blue-Shield of Nebraska |
| HRW | Blue-Cross Blue-Shield of Illinois |
| HRX | No Prefix Assigned |
| HRY | Anthem BCBS of Virginia |
| HRZ | Regence Blue-Cross Blue-Shield of Oregon |
| HSA | Horizon Blue-Cross Blue-Shield of New Jersey |
| HSB | Blue-Cross Blue-Shield of Texas |
| HSC | Premera Blue Cross |
| HSD | Horizon Blue-Cross Blue-Shield of New Jersey |
| HSE | Horizon Blue-Cross Blue-Shield of New Jersey |
| HSF | Horizon Blue-Cross Blue-Shield of New Jersey |
| HSG | Horizon Blue-Cross Blue-Shield of New Jersey |
| HSH | Horizon Blue-Cross Blue-Shield of New Jersey |
| HSI | Independence Blue Cross |
| HSJ | Horizon Blue-Cross Blue-Shield of New Jersey |
| HSK | Blue-Cross Blue-Shield of Illinois |
| HSL | Horizon Blue-Cross Blue-Shield of New Jersey |
| HSM | BCBS of Tennessee |
| HSN | Highmark BCBS of Pennsylvania |
| HSO | Blue-Cross Blue-Shield of Michigan |
| HSP | Premera Blue Cross |
| HSQ | Horizon Blue-Cross Blue-Shield of New Jersey |
| HSR | Highmark BCBS of Pennsylvania |
| HSS | Blue-Cross Blue-Shield of Minnesota |
| HST | Blue-Cross Blue-Shield of Texas |
| HSU | Horizon Blue-Cross Blue-Shield of New Jersey |
| HSV | Blue-Cross Blue-Shield of Nebraska |
| HSW | CareFirst BCBS |
| HSX | Blue-Cross Blue-Shield of Michigan |
| HSY | Blue-Cross Blue-Shield of Georgia |
| HSZ | Blue-Cross Blue-Shield of Massachusetts |
| HTA | Empire Blue-Cross Blue-Shield |
| HTB | Blue-Cross Blue-Shield of Minnesota |
| HTC | Blue-Cross Blue-Shield of Texas |
| HTD | Blue-Cross Blue-Shield of Illinois |
| HTE | Blue-Cross Blue-Shield of Illinois |
| HTF | Anthem BCBS of Ohio |
| HTG | CareFirst BCBS |
| HTH | Premera Blue Cross |
| HTI | Blue Cross of Idaho |
| HTJ | Blue-Cross Blue-Shield of Illinois |
| HTK | Horizon Blue-Cross Blue-Shield of New Jersey |
| HTL | Blue Shield of California |
| HTM | Horizon Blue-Cross Blue-Shield of New Jersey |
| HTN | Blue-Cross Blue-Shield of Rhode Island |
| HTO | CareFirst BCBS |
| HTP | CareFirst BCBS |
| HTQ | No Prefix Assigned |
| HTR | Blue Shield of California |
| HTS | Premera Blue Cross |
| HTT | Blue-Cross Blue-Shield of Georgia |
| HTU | Blue-Cross Blue-Shield of South Carolina |
| HTV | Blue-Cross Blue-Shield of Texas |
| HTW | Blue Cross of California |
| HTX | Blue-Cross Blue-Shield of South Carolina |
| HTY | Highmark BCBS of Pennsylvania |
| HTZ | Blue-Cross Blue-Shield of Illinois |
| HUA | Blue-Cross Blue-Shield of Massachusetts |
| HUB | Highmark BCBS of Pennsylvania |
| HUC | Blue-Cross Blue-Shield of Michigan |
| HUD | Empire Blue-Cross Blue-Shield |
| HUE | Anthem BCBS of Connecticut |
| HUF | Horizon Blue-Cross Blue-Shield of New Jersey |
| HUG | Anthem BCBS of Colorado |
| HUH | Anthem BCBS of Wisconsin |
| HUI | No Prefix Assigned |
| HUJ | Blue-Cross Blue-Shield of South Carolina |
| HUK | CareFirst BCBS |
| HUL | Premera Blue Cross |
| HUM | Highmark BCBS of Pennsylvania |
| HUN | Wellmark BCBS |
| HUO | Excellus BCBS |
| HUP | Blue-Cross Blue-Shield of Kansas City |
| HUQ | Blue-Cross Blue-Shield of Kansas City |
| HUR | Blue-Cross Blue-Shield of Illinois |
| HUS | Blue-Cross Blue-Shield of Michigan |
| HUT | Blue-Cross Blue-Shield of Michigan |
| HUU | Blue-Cross Blue-Shield of Kansas City |
| HUV | Wellmark BCBS |
| HUW | Empire Blue-Cross Blue-Shield |
| HUX | Anthem BCBS of Ohio |
| HUY | Blue-Cross Blue-Shield of Alabama |
| HUZ | Wellmark BCBS |
| HVA | Blue-Cross Blue-Shield of Massachusetts |
| HVB | Blue-Cross Blue-Shield of Minnesota |
| HVC | Blue-Cross Blue-Shield of Georgia |
| HVD | Horizon Blue-Cross Blue-Shield of New Jersey |
| HVE | Wellmark BCBS |
| HVF | Blue-Cross Blue-Shield of Massachusetts |
| HVG | Anthem BCBS of Ohio |
| HVH | Anthem BCBS of Kentucky |
| HVI | Blue Shield of California |
| HVJ | Highmark BCBS of Pennsylvania |
| HVK | Anthem Blue Cross of California |
| HVL | Excellus BCBS |
| HVM | Blue-Cross Blue-Shield of Massachusetts |
| HVN | Anthem BCBS of Ohio |
| HVO | Anthem BCBS of Ohio |
| HVP | Blue-Cross Blue-Shield of Michigan |
| HVQ | CareFirst BCBS |
| HVR | Anthem BCBS of Wisconsin |
| HVS | No Prefix Assigned |
| HVT | Blue Cross of California |
| HVU | CareFirst BCBS |
| HVV | Blue-Cross Blue-Shield of Nebraska |
| HVW | No Prefix Assigned |
| HVX | Anthem BCBS of Ohio |
| HVY | Blue-Cross Blue-Shield of South Carolina |
| HVZ | Blue-Cross Blue-Shield of Georgia |
| HWA | Horizon Blue-Cross Blue-Shield of New Jersey |
| HWB | Horizon Blue-Cross Blue-Shield of New Jersey |
| HWC | No Prefix Assigned |
| HWD | Blue Cross of California |
| HWE | Horizon Blue-Cross Blue-Shield of New Jersey |
| HWF | Anthem BCBS of Ohio |
| HWG | Wellmark BCBS |
| HWH | Blue Cross of California |
| HWI | Wellmark BCBS |
| HWJ | CareFirst BCBS |
| HWK | Anthem BCBS of Ohio |
| HWL | Anthem BCBS of Ohio |
| HWM | Blue Cross of Idaho |
| HWN | CareFirst BCBS |
| HWO | CareFirst BCBS |
| HWP | Anthem BCBS of Ohio |
| HWQ | Horizon Blue-Cross Blue-Shield of New Jersey |
| HWR | Blue-Cross Blue-Shield of Massachusetts |
| HWS | Regence Blue-Cross Blue-Shield of Utah |
| HWT | Anthem BCBS of Colorado |
| HWU | Anthem BCBS of Kentucky |
| HWV | Anthem BCBS of Ohio |
| HWW | Horizon Blue-Cross Blue-Shield of New Jersey |
| HWX | Wellmark BCBS |
| HWY | Premera Blue Cross |
| HWZ | Blue-Cross Blue-Shield of Montana |
| HXA | Blue-Cross Blue-Shield of Massachusetts |
| HXB | Anthem BCBS of Colorado |
| HXC | Anthem BCBS of Ohio |
| HXD | No Prefix Assigned |
| HXE | Anthem BCBS of Wisconsin |
| HXF | Anthem BCBS of Nevada |
| HXG | Blue-Cross Blue-Shield of Georgia |
| HXH | No Prefix Assigned |
| HXI | Blue Shield of California |
| HXJ | Anthem BCBS of Indiana |
| HXK | Wellmark BCBS |
| HXL | No Prefix Assigned |
| HXM | Anthem BCBS of Virginia |
| HXN | Anthem BCBS of Ohio |
| HXO | Blue-Cross Blue-Shield of Nebraska |
| HXP | Wellmark BCBS |
| HXQ | Blue-Cross Blue-Shield of Alabama |
| HXR | Premera Blue Cross |
| HXS | Horizon Blue-Cross Blue-Shield of New Jersey |
| HXT | Independence Blue Cross |
| HXU | Anthem BCBS of Indiana |
| HXV | Anthem BCBS of Indiana |
| HXW | Blue Cross of California |
| HXX | CareFirst BCBS |
| HXY | Regence Blue Shield of Washington |
| HXZ | Wellmark BCBS |
| HYA | Premera Blue Cross |
| HYB | Horizon Blue-Cross Blue-Shield of New Jersey |
| HYC | Blue Shield of California |
| HYD | Blue-Cross Blue-Shield of Kansas City |
| HYE | Blue Cross of California |
| HYF | Blue-Cross Blue-Shield of Arizona |
| HYG | Blue-Cross Blue-Shield of Michigan |
| HYH | Blue Shield of California |
| HYI | Wellmark BCBS |
| HYJ | Blue-Cross Blue-Shield of Illinois |
| HYK | Blue-Cross Blue-Shield of Illinois |
| HYL | Anthem BCBS of Virginia |
| HYM | Wellmark BCBS |
| HYN | Blue-Cross Blue-Shield of Alabama |
| HYO | Capital BlueCross |
| HYP | Blue-Cross Blue-Shield of Georgia |
| HYQ | Blue-Cross Blue-Shield of Michigan |
| HYR | Highmark BCBS of Pennsylvania |
| HYS | Anthem BCBS of Ohio |
| HYT | Blue-Cross Blue-Shield of Illinois |
| HYU | Blue Cross of California |
| HYV | Wellmark BCBS |
| HYW | Blue-Cross Blue-Shield of Illinois |
| HYX | Wellmark BCBS |
| HYY | Blue-Cross Blue-Shield of North Carolina |
| HYZ | Wellmark BCBS |
| HZA | Blue-Cross Blue-Shield of Georgia |
| HZB | Florida Blue |
| HZC | Blue-Cross Blue-Shield of Illinois |
| HZD | Blue-Cross Blue-Shield of Illinois |
| HZE | No Prefix Assigned |
| HZF | Blue-Cross Blue-Shield of Illinois |
| HZG | Anthem BCBS of Indiana |
| HZH | Wellmark BCBS |
| HZI | Blue-Cross Blue-Shield of Nebraska |
| HZJ | Premera Blue Cross |
| HZK | Blue-Cross Blue-Shield of Illinois |
| HZL | Blue-Cross Blue-Shield of Texas |
| HZM | BCBS of Western New York |
| HZN | Anthem BCBS of Indiana |
| HZO | Blue-Cross Blue-Shield of Rhode Island |
| HZP | No Prefix Assigned |
| HZQ | Blue Shield of California |
| HZR | Premera Blue Cross |
| HZS | Blue Shield of California |
| HZT | Highmark BCBS of Pennsylvania |
| HZU | Premera Blue Cross |
| HZV | Blue Cross of California |
| HZW | Blue-Cross Blue-Shield of Michigan |
| HZX | Blue-Cross Blue-Shield of Michigan |
| HZY | Blue-Cross Blue-Shield of Texas |
| HZZ | Anthem BCBS of Ohio |
