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