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