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