| HAA | Horizon BCBS of New Jersey |
| HAB | Horizon BCBS of New Jersey |
| HAC | Horizon BCBS of New Jersey |
| HAD | CareFirst BCBS |
| HAE | BCBS of Massachusetts |
| HAF | Horizon BCBS 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 | BCBS of Minnesota |
| HAM | Horizon BCBS of New Jersey |
| HAN | No Prefix Assigned |
| HAO | BCBS of Michigan |
| HAP | BCBS of Oklahoma |
| HAQ | Horizon BCBS of New Jersey |
| HAR | Regence Blue Shield of Idaho |
| HAS | BCBS of Massachusetts |
| 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 | BCBS of Texas |
| HAZ | Horizon BCBS of New Jersey |
| HBA | Anthem BCBS of Connecticut |
| HBB | BCBS of Illinois |
| HBC | Highmark BCBS of Pennsylvania |
| HBD | Horizon BCBS of New Jersey |
| HBE | Highmark BCBS of Pennsylvania |
| HBF | BCBS of Georgia |
| HBG | CareFirst BCBS |
| HBH | Horizon BCBS of New Jersey |
| HBI | No Prefix Assigned |
| HBJ | BCBS of Arkansas |
| HBK | Horizon BCBS of New Jersey |
| HBL | Anthem BCBS of Missouri |
| HBM | Horizon BCBS of New Jersey |
| HBN | BCBS of Georgia |
| HBO | Regence BCBS of Oregon |
| HBP | BCBS of Minnesota |
| HBQ | Blue Cross of California |
| HBR | BCBS of Massachusetts |
| HBS | BCBS of Arkansas |
| HBT | BCBS of Texas |
| HBU | BCBS of Georgia |
| HBV | Blue Cross of California |
| HBW | BCBS of North Carolina |
| HBX | Horizon BCBS of New Jersey |
| HBY | Horizon BCBS of New Jersey |
| HBZ | BCBS of Arkansas |
| HCA | BCBS of Minnesota |
| HCB | BCBS of Texas |
| HCC | CareFirst BCBS |
| HCD | Horizon BCBS of New Jersey |
| HCE | BCBS of Tennessee |
| HCF | Anthem BCBS of Wisconsin |
| HCG | Wellmark BCBS |
| HCH | CareFirst BCBS |
| HCI | BCBS of Nebraska |
| HCJ | BCBS of Illinois |
| HCK | Blue Cross of Idaho |
| HCL | BCBS of Illinois |
| HCM | Wellmark BCBS |
| HCN | BCBS of Massachusetts |
| HCO | Horizon BCBS of New Jersey |
| HCP | Independence Blue Cross |
| HCQ | No Prefix Assigned |
| HCR | BCBS of Tennessee |
| HCS | Regence BCBS of Oregon |
| HCT | Highmark BCBS of Pennsylvania |
| HCU | BCBS of Tennessee |
| HCV | Wellmark BCBS |
| HCW | Horizon BCBS of New Jersey |
| HCX | Anthem BCBS of Ohio |
| HCY | Anthem BCBS of Ohio |
| HCZ | Blue Cross of California |
| HDA | Regence BCBS of Oregon |
| HDB | Blue Cross of California |
| HDC | BCBS of Texas |
| HDD | BCBS of Minnesota |
| HDE | BCBS of Tennessee |
| HDF | BCBS of Illinois |
| HDG | BCBS of Mississippi |
| HDH | Wellmark BCBS |
| HDI | Blue Shield of California |
| HDJ | Blue Cross of California |
| HDK | BCBS of South Carolina |
| HDL | Blue Cross of California |
| HDM | BCBS of South Carolina |
| HDN | BCBS of Tennessee |
| HDO | Blue Cross of California |
| HDP | Blue Cross of California |
| HDQ | Blue Cross of California |
| HDR | BCBS 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 | BCBS of Alabama |
| HDY | Blue Cross of California |
| HDZ | Blue Shield of California |
| HEA | Blue Cross 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 | BCBS of Georgia |
| HEH | BCBS of Kansas |
| HEI | BCBS of Arkansas |
| HEJ | BCBS of South Carolina |
| HEK | BCBS of Michigan |
| HEL | BCBS of Texas |
| HEM | Highmark BCBS of Pennsylvania |
| HEN | Horizon BCBS of New Jersey |
| HEO | Blue Cross of California |
| HEP | Wellmark BCBS |
| HEQ | BCBS of Illinois |
| HER | CareFirst BCBS |
| HES | BCBS of Georgia |
| HET | Highmark BCBS of Pennsylvania |
| HEU | BCBS of Massachusetts |
| HEV | Wellmark BCBS |
| HEW | No Prefix Assigned |
| HEX | Blue Cross of California |
| 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 | Blue Cross of California |
| HFG | No Prefix Assigned |
| HFH | Highmark BCBS of Pennsylvania |
| HFI | BCBS of South Carolina |
| HFJ | Anthem BCBS of Wisconsin |
| HFK | CareFirst BCBS |
| HFL | Regence Blue Shield of Washington |
| HFM | Horizon BCBS of New Jersey |
| HFN | BCBS of Minnesota |
| HFO | BCBS of Tennessee |
| HFP | BCBS of Hawaii |
| HFQ | BCBS of Georgia |
| HFR | Horizon BCBS of New Jersey |
| HFS | Blue Cross of California |
| HFT | Regence Blue Shield of Washington |
| HFU | BCBS of Georgia |
| HFV | BCBS of Georgia |
| HFW | Horizon BCBS of New Jersey |
| HFX | BCBS of Minnesota |
| HFY | BCBS of Georgia |
| HFZ | Anthem BCBS of Ohio |
| HGA | BCBS of Massachusetts |
| HGB | CareFirst BCBS |
| HGC | No Prefix Assigned |
| HGD | BCBS of Texas |
| HGE | BCBS of Minnesota |
| HGF | Wellmark BCBS |
| HGG | Wellmark BCBS |
| HGH | Capital BlueCross |
| HGI | No Prefix Assigned |
| HGJ | CareFirst BCBS |
| HGK | BCBS of Georgia |
| HGL | No Prefix Assigned |
| HGM | Wellmark BCBS |
| HGN | No Prefix Assigned |
| HGO | Regence Blue Shield of Washington |
| HGP | Wellmark BCBS |
| HGQ | BCBS of Michigan |
| HGR | BCBS of Alabama |
| HGS | Horizon BCBS 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 BCBS |
| HHC | Anthem BCBS of Connecticut |
| HHD | Wellmark BCBS |
| HHE | Anthem BCBS of Connecticut |
| HHF | Wellmark BCBS |
| HHG | BCBS of Wisconsin |
| HHH | Anthem BCBS of Kentucky |
| HHI | Wellmark BCBS |
| HHJ | BCBS of Michigan |
| HHK | BCBS of Texas |
| HHL | BCBS of Michigan |
| HHM | BCBS of South Carolina |
| HHN | BCBS of Alabama |
| HHO | Wellmark BCBS |
| HHP | Horizon BCBS of New Jersey |
| HHQ | Wellmark BCBS |
| HHR | Anthem BCBS of Virginia |
| HHS | Blue Cross of Idaho |
| HHT | Anthem BCBS of Ohio |
| HHU | BCBS of Illinois |
| HHV | BCBS of Massachusetts |
| HHW | Horizon BCBS of New Jersey |
| HHX | Capital BlueCross |
| HHY | BCBS of Minnesota |
| HHZ | BCBS of South Carolina |
| HIA | No Prefix Assigned |
| HIB | BCBS of Alabama |
| HIC | No Prefix Assigned |
| HID | Blue Cross of California |
| HIE | BCBS of Massachusetts |
| HIF | Blue Cross of Idaho |
| HIG | Blue Shield of California |
| HIH | Wellmark BCBS |
| HII | Blue Shield of California |
| HIJ | Wellmark BCBS |
| HIK | BCBS of South Carolina |
| HIL | BCBS of South Carolina |
| HIM | Highmark BCBS of Pennsylvania |
| HIN | BCBS of Vermont |
| HIO | BCBS of Michigan |
| HIP | Highmark BCBS of Pennsylvania |
| HIQ | Blue Shield of California |
| HIR | BCBS of Minnesota |
| HIS | BCBS of Kansas City |
| HIT | Highmark BCBS of Pennsylvania |
| HIU | BCBS of Tennessee |
| HIV | Regence BCBS of Oregon |
| HIW | BCBS of Georgia |
| HIX | BCBS of South Carolina |
| HIY | BCBS of Georgia |
| HIZ | Regence BCBS of Oregon |
| HJA | Blue Cross of California |
| HJB | Anthem BCBS of Ohio |
| HJC | BCBS of Michigan |
| HJD | BCBS of Illinois |
| HJE | BCBS of Nebraska |
| HJF | Blue Cross of California |
| HJG | Highmark BCBS of Pennsylvania |
| HJH | BCBS of Illinois |
| HJI | BCBS of Michigan |
| HJJ | BCBS of Texas |
| HJK | BCBS of Texas |
| HJL | BCBS of Illinois |
| HJM | Blue Shield of California |
| HJN | Horizon BCBS 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 | BCBS of Alabama |
| HJW | Empire BCBS |
| HJX | Highmark BCBS of Pennsylvania |
| HJY | BCBS of Michigan |
| HJZ | Wellmark BCBS |
| HKA | CareFirst BCBS |
| HKB | Anthem BCBS of Virginia |
| HKC | Wellmark BCBS |
| HKD | BCBS of Michigan |
| HKE | Anthem BCBS of Kentucky |
| HKF | Wellmark BCBS |
| HKG | Anthem BCBS of Kentucky |
| HKH | Empire BCBS |
| HKI | BCBS of Michigan |
| HKJ | CareFirst BCBS |
| HKK | Anthem BCBS of Virginia |
| HKL | BCBS of Massachusetts |
| HKM | BCBS of Georgia |
| HKN | CareFirst BCBS |
| HKO | Blue Shield of California |
| HKP | BCBS of Michigan |
| HKQ | Anthem BCBS of Virginia |
| HKR | BCBS of Illinois |
| HKS | Regence Blue Shield of Washington |
| HKT | Wellmark BCBS |
| HKU | BCBS of Minnesota |
| HKV | BCBS 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 | BCBS of Texas |
| HLI | Blue Cross of Idaho |
| HLJ | BCBS of South Carolina |
| HLK | Anthem BCBS of Ohio |
| HLL | No Prefix Assigned |
| HLM | Horizon BCBS of New Jersey |
| HLN | BCBS of Illinois |
| HLO | Anthem BCBS of Missouri |
| HLP | Wellmark BCBS |
| HLQ | Anthem BCBS of Missouri |
| HLR | Horizon BCBS of New Jersey |
| HLS | BCBS of South Carolina |
| HLT | BCBS of Massachusetts |
| HLU | Premera Blue Cross |
| HLV | BCBS of Texas |
| HLW | Empire BCBS |
| 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 |
| HMD | BCBS of Alabama |
| HME | BCBS of Texas |
| HMF | BCBS of Nebraska |
| HMG | BCBS of Georgia |
| HMH | Anthem BCBS of Wisconsin |
| HMI | BCBS of Massachusetts |
| HMJ | CareFirst BCBS |
| HMK | BCBS of Nebraska |
| HML | BCBS of Alabama |
| HMM | BCBS of Georgia |
| HMN | Wellmark BCBS |
| HMO | BCBS of Arkansas |
| HMP | Wellmark BCBS |
| HMQ | BCBS of Minnesota |
| HMR | Excellus BCBS |
| HMS | Premera Blue Cross |
| HMT | Empire BCBS |
| HMU | Blue Cross of Idaho |
| HMV | Empire BCBS |
| HMW | BCBS of Georgia |
| HMX | Wellmark BCBS |
| HMY | BCBS of South Carolina |
| HMZ | Empire BCBS |
| HNA | BCBS of Alabama |
| HNB | No Prefix Assigned |
| HNC | Anthem BCBS of Ohio |
| HND | Regence BCBS of Oregon |
| HNE | BCBS of South Carolina |
| HNF | BCBS of Texas |
| HNG | Highmark BCBS of Pennsylvania |
| HNH | Blue Cross of California |
| HNI | BCBS of Massachusetts |
| HNJ | Highmark BCBS of Pennsylvania |
| HNK | BCBS 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 | BCBS of Texas |
| HNU | Regence Blue Shield of Washington |
| HNV | Anthem BCBS of Ohio |
| HNW | BCBS of Georgia |
| HNX | BCBS of Michigan |
| HNY | BCBS of Michigan |
| HNZ | BCBS of Michigan |
| HOA | BCBS of Michigan |
| HOB | BCBS of Mississippi |
| HOC | BCBS of Georgia |
| HOD | BCBS of Georgia |
| HOE | BCBS of South Carolina |
| HOF | No Prefix Assigned |
| HOG | Independence Blue Cross |
| HOH | CareFirst BCBS |
| HOI | Blue Cross of Idaho |
| HOJ | BCBS of Massachusetts |
| HOK | CareFirst BCBS |
| HOL | BCBS of South Carolina |
| HOM | BCBS of Nebraska |
| HON | Wellmark BCBS |
| HOO | CareFirst BCBS |
| HOP | Premera Blue Cross |
| HOQ | Independence Blue Cross |
| HOR | Independence Blue Cross |
| HOS | BCBS of Massachusetts |
| HOT | BCBS of Massachusetts |
| HOU | Anthem BCBS of Ohio |
| HOV | Highmark BCBS of Pennsylvania |
| HOW | BCBS of Alabama |
| HOX | BCBS of Massachusetts |
| HOY | CareFirst BCBS |
| HOZ | CareFirst BCBS |
| HPA | Horizon BCBS of New Jersey |
| HPB | Anthem BCBS of Missouri |
| HPC | BCBS of South Carolina |
| HPD | BCBS of Massachusetts |
| HPE | Blue Cross of California |
| HPF | Horizon BCBS of New Jersey |
| HPG | BCBS of South Carolina |
| HPH | Anthem BCBS of Colorado |
| HPI | Capital BlueCross |
| HPJ | BCBS of Michigan |
| HPK | Blue Cross of California |
| HPL | Blue Cross of California |
| HPM | Blue Shield of California |
| HPN | Anthem BCBS of Virginia |
| HPO | BCBS of North Carolina |
| HPP | BCBS of Illinois |
| HPQ | Blue Cross of California |
| HPR | Horizon BCBS of New Jersey |
| HPS | CareFirst BCBS |
| HPT | BCBS of Oklahoma |
| HPU | BCBS of Illinois |
| HPV | Blue Cross of California |
| HPW | CareFirst BCBS |
| HPX | BCBS of Alabama |
| HPY | Empire BCBS |
| HPZ | Florida Blue |
| HQA | No Prefix Assigned |
| HQB | No Prefix Assigned |
| HQC | BCBS of Minnesota |
| HQD | Wellmark BCBS |
| HQE | Anthem BCBS of Missouri |
| HQF | Anthem BCBS of Ohio |
| HQG | BCBS of Georgia |
| HQH | BCBS of Kansas City |
| HQI | BCBS of North Carolina |
| HQJ | BCBS of Massachusetts |
| HQK | No Prefix Assigned |
| HQL | Anthem BCBS of Missouri |
| HQM | BCBS of South Carolina |
| HQN | Wellmark BCBS |
| HQO | BCBS of Western New York |
| HQP | Anthem BCBS of Missouri |
| HQQ | Regence BCBS of Oregon |
| HQR | BCBS of Western New York |
| HQS | Blue Shield of Northeastern New York |
| HQT | BCBS of Western New York |
| HQU | BCBS of Michigan |
| HQV | No Prefix Assigned |
| HQW | Regence BCBS of Utah |
| HQX | Blue Shield 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 |
| HRD | Wellmark BCBS |
| HRE | BCBS of Illinois |
| HRF | Highmark BCBS of Pennsylvania |
| HRG | Wellmark BCBS |
| HRH | Blue Cross of California |
| HRI | BCBS of Minnesota |
| HRJ | Blue Cross of California |
| HRK | Premera Blue Cross |
| HRL | BCBS of Minnesota |
| HRM | Highmark BCBS of Pennsylvania |
| HRN | Premera Blue Cross |
| HRO | Capital BlueCross |
| HRP | CareFirst BCBS |
| HRQ | BCBS of Minnesota |
| HRR | BCBS of Illinois |
| HRS | Premera Blue Cross |
| HRT | Highmark BCBS of Pennsylvania |
| HRU | BCBS of Western New York |
| HRV | BCBS of Nebraska |
| HRW | BCBS of Illinois |
| HRX | No Prefix Assigned |
| HRY | Anthem BCBS of Virginia |
| HRZ | Regence BCBS of Oregon |
| HSA | Horizon BCBS of New Jersey |
| HSB | BCBS of Texas |
| HSC | Premera Blue Cross |
| 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 Blue Cross |
| 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 | Premera Blue Cross |
| HSQ | Horizon BCBS of New Jersey |
| HSR | Highmark BCBS of Pennsylvania |
| HSS | BCBS of Minnesota |
| HST | BCBS of Texas |
| HSU | Horizon BCBS of New Jersey |
| HSV | BCBS of Nebraska |
| HSW | CareFirst BCBS |
| HSX | BCBS of Michigan |
| HSY | BCBS of Georgia |
| HSZ | BCBS of Massachusetts |
| HTA | Empire BCBS |
| HTB | BCBS of Minnesota |
| HTC | BCBS of Texas |
| HTD | BCBS of Illinois |
| HTE | BCBS of Illinois |
| HTF | Anthem BCBS of Ohio |
| HTG | CareFirst BCBS |
| HTH | Premera Blue Cross |
| HTI | Blue Cross of Idaho |
| HTJ | BCBS of Illinois |
| HTK | Horizon BCBS of New Jersey |
| HTL | Blue Shield of California |
| HTM | Horizon BCBS of New Jersey |
| HTN | BCBS of Rhode Island |
| HTO | CareFirst BCBS |
| HTP | CareFirst BCBS |
| HTQ | No Prefix Assigned |
| HTR | Blue Shield of California |
| HTS | Premera Blue Cross |
| HTT | BCBS of Georgia |
| HTU | BCBS of South Carolina |
| HTV | BCBS of Texas |
| HTW | Blue Cross of California |
| HTX | BCBS of South Carolina |
| 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 |
| HUE | Anthem BCBS of Connecticut |
| HUF | Horizon BCBS of New Jersey |
| HUG | Anthem BCBS of Colorado |
| HUH | Anthem BCBS of Wisconsin |
| HUI | No Prefix Assigned |
| HUJ | BCBS of South Carolina |
| HUK | CareFirst BCBS |
| HUL | Premera Blue Cross |
| HUM | Highmark BCBS of Pennsylvania |
| HUN | Wellmark BCBS |
| HUO | Excellus BCBS |
| HUP | BCBS of Kansas City |
| HUQ | BCBS of Kansas City |
| HUR | BCBS of Illinois |
| HUS | BCBS of Michigan |
| HUT | BCBS of Michigan |
| HUU | BCBS of Kansas City |
| HUV | Wellmark BCBS |
| HUW | Empire BCBS |
| HUX | Anthem BCBS of Ohio |
| HUY | BCBS of Alabama |
| HUZ | Wellmark BCBS |
| HVA | BCBS of Massachusetts |
| HVB | BCBS of Minnesota |
| HVC | BCBS of Georgia |
| HVD | Horizon BCBS of New Jersey |
| HVE | Wellmark BCBS |
| HVF | BCBS 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 | BCBS of Massachusetts |
| HVN | Anthem BCBS of Ohio |
| HVO | Anthem BCBS of Ohio |
| HVP | BCBS of Michigan |
| HVQ | CareFirst BCBS |
| HVR | Anthem BCBS of Wisconsin |
| HVS | No Prefix Assigned |
| HVT | Blue Cross of California |
| HVU | CareFirst BCBS |
| HVV | BCBS of Nebraska |
| HVW | No Prefix Assigned |
| HVX | Anthem BCBS of Ohio |
| HVY | BCBS of South Carolina |
| HVZ | BCBS of Georgia |
| HWA | Horizon BCBS of New Jersey |
| HWB | Horizon BCBS of New Jersey |
| HWC | No Prefix Assigned |
| HWD | Blue Cross of California |
| HWE | Horizon BCBS 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 BCBS of New Jersey |
| HWR | BCBS of Massachusetts |
| HWS | Regence BCBS of Utah |
| HWT | Anthem BCBS of Colorado |
| HWU | Anthem BCBS of Kentucky |
| HWV | Anthem BCBS of Ohio |
| HWW | Horizon BCBS of New Jersey |
| HWX | Wellmark BCBS |
| HWY | Premera Blue Cross |
| HWZ | BCBS of Montana |
| HXA | BCBS 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 | BCBS 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 | BCBS of Nebraska |
| HXP | Wellmark BCBS |
| HXQ | BCBS of Alabama |
| HXR | Premera Blue Cross |
| HXS | Horizon BCBS 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 BCBS of New Jersey |
| HYC | Blue Shield of California |
| HYD | BCBS of Kansas City |
| HYE | Blue Cross of California |
| HYF | BCBS of Arizona |
| HYG | BCBS of Michigan |
| HYH | Blue Shield of California |
| HYI | Wellmark BCBS |
| HYJ | BCBS of Illinois |
| HYK | BCBS of Illinois |
| HYL | Anthem BCBS of Virginia |
| HYM | Wellmark BCBS |
| HYN | BCBS of Alabama |
| HYO | Capital BlueCross |
| HYP | BCBS of Georgia |
| HYQ | BCBS of Michigan |
| HYR | Highmark BCBS of Pennsylvania |
| HYS | Anthem BCBS of Ohio |
| HYT | BCBS of Illinois |
| HYU | Blue Cross of California |
| HYV | Wellmark BCBS |
| HYW | BCBS of Illinois |
| HYX | Wellmark BCBS |
| HYY | BCBS of North Carolina |
| HYZ | Wellmark BCBS |
| HZA | BCBS of Georgia |
| HZB | Florida Blue |
| HZC | BCBS of Illinois |
| HZD | BCBS of Illinois |
| HZE | No Prefix Assigned |
| HZF | BCBS of Illinois |
| HZG | Anthem BCBS of Indiana |
| HZH | Wellmark BCBS |
| HZI | BCBS of Nebraska |
| HZJ | Premera Blue Cross |
| 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 | 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 | BCBS of Michigan |
| HZX | BCBS of Michigan |
| HZY | BCBS of Texas |
| HZZ | Anthem BCBS of Ohio |
| H2A | BCBS of Illinois |
| H2B | BCBS of Western New York |
| H2C | BCBS of Illinois |
| H2D | BCBS of Illinois |
| H2F | Anthem BCBS of Indiana |
| H2G | BCBS of Texas |
| H2H | BCBS of Arkansas |
| H2J | BCBS of Illinois |
| H2K | BCBS of Illinois |
| H2L | Anthem BCBS of Indiana |
| H2M | Anthem BCBS of Virginia |
| H2N | Horizon BCBS of New Jersey |
| H2O | Highmark BCBS of Pennsylvania |
| H2P | BCBS of Illinois |
| H2Q | Anthem BCBS of Indiana |
| H2R | BCBS of Western New York |
| H2S | Anthem BCBS of Indiana |
| H2U | Anthem BCBS of Indiana |
| H2W | Horizon BCBS of New Jersey |
| H2X | BCBS of Massachusetts |
| H2Y | Horizon BCBS of New Jersey |
| H2Z | Horizon BCBS of New Jersey |
| H3A | Highmark BCBS of Pennsylvania |
| H3B | Highmark BCBS of Pennsylvania |
| H3C | Anthem BCBS of Virginia |
| H3D | BCBS of Illinois |
| H3E | Highmark BCBS of Pennsylvania |
| H3F | Anthem BCBS of Virginia |
| H3G | Premera Blue Cross |
| H3H | Anthem BCBS of Virginia |
| H3I | Highmark BCBS of Pennsylvania |
| H3J | Anthem BCBS of Virginia |
| H3K | Anthem BCBS of Virginia |
| H3L | Highmark BCBS of Pennsylvania |
| H3M | BCBS of Texas |
| H3N | Blue Cross of California |
| H3P | Highmark BCBS of Pennsylvania |
| H3Q | Highmark BCBS of Pennsylvania |
| H3R | BCBS of Illinois |
| H3S | Horizon BCBS of New Jersey |
| H3U | BCBS of Illinois |
| H3Z | Anthem BCBS of Virginia |
| H4A | BCBS of Illinois |
| H4B | BCBS of Illinois |
| H4C | Anthem BCBS of Virginia |
| H4D | BCBS of Illinois |
| H4F | Highmark BCBS of Pennsylvania |
| H4G | Blue Cross of California |
| H4H | BCBS of Rhode Island |
| H4J | Highmark BCBS of Pennsylvania |
| H4K | Highmark BCBS of Pennsylvania |
| H4M | Anthem BCBS of Virginia |
| H4N | Blue Cross of California |
| H4O | Blue Cross of California |
| H4R | Anthem BCBS of Colorado |
| H4S | Anthem BCBS of Indiana |
| H4T | BCBS of Texas |
| H5D | BCBS of Texas |
| H5G | Anthem BCBS of Virginia |
| H5K | Horizon BCBS of New Jersey |
| H5N | Anthem BCBS of Virginia |
| H5P | Blue Cross of California |
| H5R | Horizon BCBS of New Jersey |
| H5T | Anthem BCBS of Virginia |
| H6A | BCBS of Illinois |
| H6C | Anthem BCBS of Virginia |
| H6D | Blue Cross of California |
| H6F | Empire BCBS |
| H6G | Blue Cross of California |
| H6H | Regence BCBS of Oregon |
| H6N | Anthem BCBS of Virginia |
| H6P | BCBS of Massachusetts |
| H7B | Horizon BCBS of New Jersey |
| H7C | BCBS of Illinois |
| H7D | BCBS of Illinois |
| H7G | Regence Blue Shield of Washington |
| H7J | Horizon BCBS of New Jersey |
| H7P | Horizon BCBS of New Jersey |
| H8A | Anthem BCBS of Virginia |
| H8D | BCBS of Illinois |
| H8L | BCBS of Illinois |
| H8P | Blue Cross of California |
| H9K | BCBS of Illinois |
