| FAA | Anthem BCBS of Wisconsin (WI) |
| FAB | Anthem BCBS of Virginia (VA) |
| FAC | BCBS of Vermont (VT) |
| FAD | BCBS of Illinois (IL) |
| FAE | BCBS of South Carolina (SC) / Southcarolinablues |
| FAF | Anthem BCBS of Ohio (OH) |
| FAG | Unassigned Prefix |
| FAH | Anthem BCBS of Ohio (OH) |
| FAI | Unassigned Prefix |
| FAJ | Anthem BCBS of Georgia (GA) |
| FAK | Anthem BCBS of Georgia (GA) |
| FAL | Anthem Blue Cross(BC) of California (CA) |
| FAM | Wellmark |
| FAN | Unassigned Prefix |
| FAO | BCBS of Vermont (VT) |
| FAP | Unassigned Prefix |
| FAQ | BCBS of North Carolina (NC) |
| FAR | Anthem Blue Cross(BC) of California (CA) |
| FAS | Anthem Blue Cross(BC) of California (CA) |
| FAT | Unassigned Prefix |
| FAU | Anthem BCBS of Virginia (VA) |
| FAV | Unassigned Prefix |
| FAW | Anthem BCBS of Georgia (GA) |
| FAX | BCBS of Illinois (IL) |
| FAY | Anthem BCBS of Georgia (GA) |
| FAZ | Anthem BCBS of Virginia (VA) |
| FBA | BCBS of Western New York (WNY) |
| FBB | Anthem BCBS of Colorado (CO) |
| FBC | BCBS of South Carolina (SC) / Southcarolinablues |
| FBD | Anthem BCBS of Ohio (OH) |
| FBE | Unassigned Prefix |
| FBF | Anthem BCBS of Georgia (GA) |
| FBG | Anthem BCBS of Ohio (OH) |
| FBH | Florida (FL) Blue |
| FBI | Unassigned Prefix |
| FBJ | Anthem BCBS of Ohio (OH) |
| FBK | Unassigned Prefix |
| FBL | BCBS of Kansas City |
| FBM | BCBS of Kansas City |
| FBN | BCBS of South Carolina (SC) / Southcarolinablues |
| FBO | Unassigned Prefix |
| FBP | BCBS Blue Care Network Michigan (MI) |
| FBQ | BCBS of Nebraska (NE) |
| FBR | BCBS of Illinois (IL) |
| FBS | BCBS of South Carolina (SC) / Southcarolinablues |
| FBT | Regence BCBS |
| FBU | Unassigned Prefix |
| FBV | Unassigned Prefix |
| FBW | Unassigned Prefix |
| FBX | Unassigned Prefix |
| FBY | Arkansas (AR) Blue Cross |
| FBZ | BCBS Blue Care Network Michigan (MI) |
| FCA | Anthem BCBS of Indiana (IN) |
| FCB | Unassigned Prefix |
| FCC | BCBS of Illinois (IL) |
| FCD | BCBS of Illinois (IL) |
| FCE | BCBS of Kansas City |
| FCF | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FCG | Anthem Blue Cross(BC) of California (CA) |
| FCH | Unassigned Prefix |
| FCI | Unassigned Prefix |
| FCJ | Blue Cross (BC) of Idaho (ID) |
| FCK | Unassigned Prefix |
| FCL | BCBS of Nebraska (NE) |
| FCM | Wellmark |
| FCN | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FCO | Blue shield(BS) of California (CA) |
| FCP | Unassigned Prefix |
| FCQ | BCBS of Minnesota (MN) |
| FCR | Unassigned Prefix |
| FCS | BCBS of Illinois (IL) |
| FCT | Anthem BCBS of Nevada (NV) |
| FCU | BCBS of Illinois (IL) |
| FCV | Unassigned Prefix |
| FCW | BCBS Blue Care Network Michigan (MI) |
| FCX | Anthem Blue Cross(BC) of California (CA) |
| FCY | Anthem BCBS of Ohio (OH) |
| FCZ | Blue shield(BS) of California (CA) |
| FDA | BCBS Blue Care Network Michigan (MI) |
| FDB | BCBS Blue Care Network Michigan (MI) |
| FDC | BCBS of Illinois (IL) |
| FDD | Empire BCBS of New York (NY) |
| FDE | Unassigned Prefix |
| FDF | Highmark BCBS of Pennsylvania (PA) |
| FDG | BCBS of Illinois (IL) |
| FDH | Highmark BCBS of Pennsylvania (PA) |
| FDI | Blue shield(BS) of California (CA) |
| FDJ | Florida (FL) Blue |
| FDK | Anthem BCBS of Georgia (GA) |
| FDL | Florida (FL) Blue |
| FDM | Empire BCBS of New York (NY) |
| FDN | Wellmark |
| FDO | BCBS of Kansas City |
| FDP | Regence BCBS |
| FDQ | Wellmark |
| FDR | Unassigned Prefix |
| FDS | Anthem Blue Cross(BC) of California (CA) |
| FDT | Empire BCBS of New York (NY) |
| FDU | Anthem BCBS of Ohio (OH) |
| FDV | Highmark BCBS of Pennsylvania (PA) |
| FDW | Anthem BCBS of Colorado (CO) |
| FDX | Unassigned Prefix |
| FDY | Unassigned Prefix |
| FDZ | Blue shield(BS) of California (CA) |
| FEA | Anthem BCBS of Georgia (GA) |
| FEB | BCBS of Kansas City |
| FEC | Unassigned Prefix |
| FED | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FEE | Florida (FL) Blue |
| FEF | Anthem BCBS of Indiana (IN) |
| FEG | Unassigned Prefix |
| FEH | Highmark BCBS of Pennsylvania (PA) |
| FEI | Unassigned Prefix |
| FEJ | Anthem BCBS of Missouri (MO) |
| FEK | BCBS of Alabama (AL) |
| FEL | Anthem BCBS of Georgia (GA) |
| FEM | Anthem BCBS of Ohio (OH) |
| FEN | Unassigned Prefix |
| FEO | Horizon BCBS of New Jersey (NJ) |
| FEP | Unassigned Prefix |
| FEQ | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FER | BCBS of South Carolina (SC) / Southcarolinablues |
| FES | Highmark BCBS of Pennsylvania (PA) |
| FET | BCBS Blue Care Network Michigan (MI) |
| FEU | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FEV | Unassigned Prefix |
| FEW | Anthem Blue Cross(BC) of California (CA) |
| FEX | Anthem Blue Cross(BC) of California (CA) |
| FEY | Anthem BCBS of Georgia (GA) |
| FEZ | Anthem BCBS of Ohio (OH) |
| FFA | BCBS Blue Care Network Michigan (MI) |
| FFB | BCBS of Nebraska (NE) |
| FFC | Highmark BCBS of Pennsylvania (PA) |
| FFD | BCBS of South Carolina (SC) / Southcarolinablues |
| FFE | Anthem BCBS of Georgia (GA) |
| FFF | Unassigned Prefix |
| FFG | Wellmark |
| FFH | BCBS of Massachusetts (MA) |
| FFI | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| FFJ | Anthem BCBS of Georgia (GA) |
| FFK | BCBS of South Carolina (SC) / Southcarolinablues |
| FFL | Wellmark |
| FFM | BCBS of Texas (TX) |
| FFN | BCBS of Nebraska (NE) |
| FFO | Anthem BCBS of Georgia (GA) |
| FFP | BCBS of Tennessee (TN) |
| FFQ | Anthem BCBS of Ohio (OH) |
| FFR | Highmark BCBS of Pennsylvania (PA) |
| FFS | Anthem Blue Cross(BC) of California (CA) |
| FFT | BCBS of Tennessee (TN) |
| FFU | Florida (FL) Blue |
| FFV | Anthem BCBS of Missouri (MO) |
| FFW | Unassigned Prefix |
| FFX | Unassigned Prefix |
| FFY | Regence BCBS |
| FFZ | BCBS of Texas (TX) |
| FGA | BCBS of South Carolina (SC) / Southcarolinablues |
| FGB | Anthem BCBS of Wisconsin (WI) |
| FGC | BCBS of Massachusetts (MA) |
| FGD | Anthem BCBS of Ohio (OH) |
| FGE | BCBS of South Carolina (SC) / Southcarolinablues |
| FGF | Unassigned Prefix |
| FGG | Florida (FL) Blue |
| FGH | Unassigned Prefix |
| FGI | Anthem BCBS of Ohio (OH) |
| FGJ | Anthem BCBS of Indiana (IN) |
| FGK | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FGL | BCBS of Texas (TX) |
| FGM | Anthem Blue Cross(BC) of California (CA) |
| FGN | Anthem BCBS of Georgia (GA) |
| FGO | Unassigned Prefix |
| FGP | BCBS Blue Care Network Michigan (MI) |
| FGQ | BCBS of Kansas City |
| FGR | BCBS of Alabama (AL) |
| FGS | BCBS Blue Care Network Michigan (MI) |
| FGT | Highmark BCBS of Pennsylvania (PA) |
| FGU | BCBS Blue Care Network Michigan (MI) |
| FGV | Anthem BCBS of Ohio (OH) |
| FGW | Anthem Blue Cross(BC) of California (CA) |
| FGX | BCBS of South Carolina (SC) / Southcarolinablues |
| FGY | Wellmark |
| FGZ | Anthem BCBS of Missouri (MO) |
| FHA | BCBS of Illinois (IL) |
| FHB | BCBS of Massachusetts (MA) |
| FHC | BCBS Blue Care Network Michigan (MI) |
| FHD | BCBS of Nebraska (NE) |
| FHE | BCBS of Nebraska (NE) |
| FHF | Unassigned Prefix |
| FHG | Wellmark |
| FHH | BCBS of Massachusetts (MA) |
| FHI | BCBS Blue Care Network Michigan (MI) |
| FHJ | Florida (FL) Blue |
| FHK | Unassigned Prefix |
| FHL | BCBS of Illinois (IL) |
| FHM | Anthem BCBS of Ohio (OH) |
| FHN | BCBS Blue Care Network Michigan (MI) |
| FHO | Anthem BCBS of Ohio (OH) |
| FHP | Anthem BCBS of Georgia (GA) |
| FHQ | Anthem BCBS of Missouri (MO) |
| FHR | Highmark BCBS of Pennsylvania (PA) |
| FHS | Blue Cross (BC) of Idaho (ID) |
| FHT | Regence BCBS |
| FHU | Premera BCBS of Alaska (AK) |
| FHV | Wellmark |
| FHW | Florida (FL) Blue |
| FHX | BCBS of Minnesota (MN) |
| FHY | BCBS of Massachusetts (MA) |
| FHZ | Unassigned Prefix |
| FIA | Anthem BCBS of Wisconsin (WI) |
| FIB | Unassigned Prefix |
| FIC | Anthem BCBS of Georgia (GA) |
| FID | BCBS of Nebraska (NE) |
| FIE | BCBS Blue Care Network Michigan (MI) |
| FIF | Unassigned Prefix |
| FIG | BCBS of Tennessee (TN) |
| FIH | BCBS of Tennessee (TN) |
| FII | Unassigned Prefix |
| FIJ | BCBS Blue Care Network Michigan (MI) |
| FIK | Wellmark |
| FIL | BCBS Blue Care Network Michigan (MI) |
| FIM | Wellmark |
| FIN | Anthem BCBS of Ohio (OH) |
| FIO | BCBS Blue Care Network Michigan (MI) |
| FIP | Blue Cross (BC) of Idaho (ID) |
| FIQ | BCBS Blue Care Network Michigan (MI) |
| FIR | Florida (FL) Blue |
| FIS | BCBS of North Carolina (NC) |
| FIT | Premera Blue Cross (BC) of Alaska (AK) |
| FIU | BCBS Blue Care Network Michigan (MI) |
| FIV | Anthem BCBS of Colorado (CO) |
| FIW | Unassigned Prefix |
| FIX | Anthem BCBS of Ohio (OH) |
| FIY | Anthem BCBS of Wisconsin (WI) |
| FIZ BCBS Prefix | Florida (FL) Blue |
| FJA | Anthem BCBS of Georgia (GA) |
| FJB BCBS Prefix | Anthem BCBS of Georgia (GA) |
| FJC | BCBS of Illinois (IL) |
| FJD | Anthem BCBS of Georgia (GA) |
| FJE | Anthem BCBS of Georgia (GA) |
| FJF BCBS Prefix | Anthem BCBS of Georgia (GA) |
| FJG | Unassigned Prefix |
| FJH | Regence BCBS |
| FJI | Wellmark |
| FJJ | BCBS of South Carolina (SC) / Southcarolinablues |
| FJK | Unassigned Prefix |
| FJL | BCBS of Nebraska (NE) |
| FJM | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| FJN | BCBS of Illinois (IL) |
| FJO | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| FJP | BCBS of Minnesota (MN) |
| FJQ | Anthem BCBS of Georgia (GA) |
| FJR | Highmark BCBS of Pennsylvania (PA) |
| FJS | BCBS of Massachusetts (MA) |
| FJT | BCBS of Tennessee (TN) |
| FJU | Anthem BCBS of Georgia (GA) |
| FJV | Anthem BCBS of Georgia (GA) |
| FJW | BCBS of Rhode Island (RI) |
| FJX | Anthem BCBS of Georgia (GA) |
| FJY | Wellmark |
| FJZ | Anthem Blue Cross(BC) of California (CA) |
| FKA | BCBS of Illinois (IL) |
| FKB | Unassigned Prefix |
| FKC | Regence BCBS |
| FKD | Wellmark |
| FKE | BCBS Blue Care Network Michigan (MI) |
| FKF | BCBS of Louisiana(LA) |
| FKG | Unassigned Prefix |
| FKH | Unassigned Prefix |
| FKI | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FKJ | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FKK | Premera BCBS of Alaska (AK) |
| FKL | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FKM | Highmark BCBS of Pennsylvania (PA) |
| FKN | Highmark BCBS of Pennsylvania (PA) |
| FKO | BCBS of South Carolina (SC) / Southcarolinablues |
| FKP | Anthem Blue Cross(BC) of California (CA) |
| FKQ | Capital Blue Cross of Pennsylvania (PA) |
| FKR | Unassigned Prefix |
| FKS | Anthem BCBS of Georgia (GA) |
| FKT | BCBS of Minnesota (MN) |
| FKU | BCBS of Louisiana(LA) |
| FKV | Wellmark |
| FKW | BCBS of North Carolina (NC) |
| FKX | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FKY | BCBS of Louisiana(LA) |
| FKZ | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FLA | Anthem BCBS of Georgia (GA) |
| FLB | BCBS of Minnesota (MN) |
| FLC | Unassigned Prefix |
| FLD | Unassigned Prefix |
| FLE | BCBS of Minnesota (MN) |
| FLF | BCBS of North Carolina (NC) |
| FLG | BCBS of Kansas City |
| FLH | BCBS of Arizona (AZ) |
| FLI | Anthem BCBS of Georgia (GA) |
| FLJ | BCBS of Nebraska (NE) |
| FLK | BCBS of Illinois (IL) |
| FLL | Anthem Blue Cross(BC) of California (CA) |
| FLM | Unassigned Prefix |
| FLN | Blue shield(BS) of Northeastern New York (NeNY) |
| FLO | Anthem BCBS of Georgia (GA) |
| FLP | Horizon BCBS of New Jersey (NJ) |
| FLQ | BCBS of South Carolina (SC) / Southcarolinablues |
| FLR | Unassigned Prefix |
| FLS | Anthem BCBS of Georgia (GA) |
| FLT | Florida (FL) Blue |
| FLU | Unassigned Prefix |
| FLV | BCBS of Texas (TX) |
| FLW | Anthem BCBS of Colorado (CO) |
| FLX | Wellmark |
| FLY | Anthem BCBS of Georgia (GA) |
| FLZ | Anthem Blue Cross(BC) of California (CA) |
| FMA | BCBS Blue Care Network Michigan (MI) |
| FMB | BCBS of Illinois (IL) |
| FMC | Unassigned Prefix |
| FMD | BCBS of Massachusetts (MA) |
| FME | Blue Cross (BC) of Idaho (ID) |
| FMF | Wellmark |
| FMG | BCBS of Minnesota (MN) |
| FMH | BCBS of Massachusetts (MA) |
| FMI | Blue shield(BS) of California (CA) |
| FMJ | Empire BCBS of New York (NY) |
| FMK | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FML | BCBS Blue Care Network Michigan (MI) |
| FMM | BCBS Blue Care Network Michigan (MI) |
| FMN | Anthem BCBS of Virginia (VA) |
| FMO | BCBS of Alabama (AL) |
| FMP | Unassigned Prefix |
| FMQ | Unassigned Prefix |
| FMR | Premera BCBS of Alaska (AK) |
| FMS | BCBS of Texas (TX) |
| FMT | BCBS of Illinois (IL) |
| FMU | Anthem BCBS of Ohio (OH) |
| FMV | BCBS Blue Care Network Michigan (MI) |
| FMW | Anthem BCBS of Ohio (OH) |
| FMX | BCBS of Minnesota (MN) |
| FMY | Unassigned Prefix |
| FMZ | Unassigned Prefix |
| FNA | BCBS of Texas (TX) |
| FNB | Anthem BCBS of Georgia (GA) |
| FNC | Unassigned Prefix |
| FND | BCBS Blue Care Network Michigan (MI) |
| FNE | Anthem BCBS of Ohio (OH) |
| FNF | Unassigned Prefix |
| FNG | BCBS of Illinois (IL) |
| FNH | BCBS of South Carolina (SC) / Southcarolinablues |
| FNI | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FNJ | Anthem BCBS of Ohio (OH) |
| FNK | Unassigned Prefix |
| FNL | BCBS of Minnesota (MN) |
| FNM | BCBS of Massachusetts (MA) |
| FNN | Regence BCBS |
| FNO | BCBS of North Carolina (NC) |
| FNP | Unassigned Prefix |
| FNQ | Anthem Blue Cross(BC) of California (CA) |
| FNR | Anthem BCBS of Kentucky (KY) |
| FNS | Anthem Blue Cross(BC) of California (CA) |
| FNT | BCBS of Nebraska (NE) |
| FNU | BCBS Blue Care Network Michigan (MI) |
| FNV | Anthem BCBS of Georgia (GA) |
| FNW | BCBS of South Carolina (SC) / Southcarolinablues |
| FNX | Unassigned Prefix |
| FNY | BCBS of Nebraska (NE) |
| FNZ | BCBS of Illinois (IL) |
| FOA | Premera BCBS of Alaska (AK) |
| FOB | Florida (FL) Blue |
| FOC | Blue shield(BS) of California (CA) |
| FOD | BCBS of South Carolina (SC) / Southcarolinablues |
| FOE | Unassigned Prefix |
| FOF | Wellmark |
| FOG | BCBS of Minnesota (MN) |
| FOH | BCBS of Kansas City |
| FOI | Unassigned Prefix |
| FOJ | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| FOK | BCBS of South Carolina (SC) / Southcarolinablues |
| FOL | Anthem BCBS of Georgia (GA) |
| FOM | Unassigned Prefix |
| FON | BCBS of South Carolina (SC) / Southcarolinablues |
| FOO | Blue shield(BS) of California (CA) |
| FOP | BCBS of Minnesota (MN) |
| FOQ | Unassigned Prefix |
| FOR | Anthem BCBS of Ohio (OH) |
| FOS | Unassigned Prefix |
| FOT | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FOU | BCBS of Alabama (AL) |
| FOV | Unassigned Prefix |
| FOW | Unassigned Prefix |
| FOX | BCBS of Illinois (IL) |
| FOY | Unassigned Prefix |
| FOZ | Unassigned Prefix |
| FPA | Anthem BCBS of Ohio (OH) |
| FPB | Unassigned Prefix |
| FPC | BCBS of Illinois (IL) |
| FPD | Anthem Blue Cross(BC) of California (CA) |
| FPE | Wellmark |
| FPF | Anthem Blue Cross(BC) of California (CA) |
| FPG | Unassigned Prefix |
| FPH | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FPI | Unassigned Prefix |
| FPJ | Highmark BCBS of Pennsylvania (PA) |
| FPK | Blue shield(BS) of California (CA) |
| FPL | Wellmark |
| FPM | BCBS Blue Care Network Michigan (MI) |
| FPN | Unassigned Prefix |
| FPO | Wellmark |
| FPP | Unassigned Prefix |
| FPQ | Highmark BCBS of Pennsylvania (PA) |
| FPR | Highmark BCBS of Pennsylvania (PA) |
| FPS | BCBS of South Carolina (SC) / Southcarolinablues |
| FPT | Unassigned Prefix |
| FPU | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FPV | Blue shield(BS) of California (CA) |
| FPW | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FPX | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FPY | Anthem BCBS of Wisconsin (WI) |
| FPZ | Anthem Blue Cross(BC) of California (CA) |
| FQA | BCBS of Louisiana(LA) |
| FQB | Unassigned Prefix |
| FQC | BCBS of South Carolina (SC) / Southcarolinablues |
| FQD | Unassigned Prefix |
| FQE | BCBS of Nebraska (NE) |
| FQF | BCBS of Minnesota (MN) |
| FQG | Unassigned Prefix |
| FQH | Anthem BCBS of Georgia (GA) |
| FQI | Anthem BCBS of Georgia (GA) |
| FQJ | Anthem BCBS of Colorado (CO) |
| FQK | BCBS of South Carolina (SC) / Southcarolinablues |
| FQL | BCBS of Arizona (AZ) |
| FQM | Unassigned Prefix |
| FQN | BCBS of Illinois (IL) |
| FQO | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FQP | BCBS of Minnesota (MN) |
| FQQ | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FQR | BCBS of Massachusetts (MA) |
| FQS | Unassigned Prefix |
| FQT | BCBS of Louisiana(LA) |
| FQU | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| FQV | Blue shield(BS) of California (CA) |
| FQW | BCBS of Louisiana(LA) |
| FQX | Unassigned Prefix |
| FQY | Wellmark |
| FQZ | BCBS of Minnesota (MN) |
| FRA | BCBS of South Carolina (SC) / Southcarolinablues |
| FRB | BCBS of Illinois (IL) |
| FRC | Wellmark |
| FRD | Anthem BCBS of Virginia (VA) |
| FRE | Anthem BCBS of Virginia (VA) |
| FRF | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FRG | BCBS of Texas (TX) |
| FRH | Anthem BCBS of Wisconsin (WI) |
| FRI | Blue shield(BS) of California (CA) |
| FRJ | Premera BCBS of Alaska (AK) |
| FRK | Unassigned Prefix |
| FRL | Unassigned Prefix |
| FRM | Unassigned Prefix |
| FRN | BCBS of Texas (TX) |
| FRO | BCBS Blue Care Network Michigan (MI) |
| FRP | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FRQ | BCBS Blue Care Network Michigan (MI) |
| FRR | BCBS of South Carolina (SC) / Southcarolinablues |
| FRS | BCBS of Massachusetts (MA) |
| FRT | Unassigned Prefix |
| FRU | BCBS of South Carolina (SC) / Southcarolinablues |
| FRV | BCBS of Alabama (AL) |
| FRW | Anthem BCBS of Missouri (MO) |
| FRX | Anthem Blue Cross(BC) of California (CA) |
| FRY | Unassigned Prefix |
| FRZ | Unassigned Prefix |
| FSA | BCBS of Massachusetts (MA) |
| FSB | Anthem BCBS of Wisconsin (WI) |
| FSC | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| FSD | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| FSE | Anthem BCBS of Ohio (OH) |
| FSF | Empire BCBS of New York (NY) |
| FSG | BCBS of Illinois (IL) |
| FSH | Premera BCBS of Alaska (AK) |
| FSI | Unassigned Prefix |
| FSJ | BCBS of Arizona (AZ) |
| FSK | Unassigned Prefix |
| FSL | BCBS of Illinois (IL) |
| FSM | Anthem BCBS of Georgia (GA) |
| FSN | BCBS of South Carolina (SC) / Southcarolinablues |
| FSO | Florida (FL) Blue |
| FSP | BCBS Blue Care Network Michigan (MI) |
| FSQ | Anthem BCBS of Georgia (GA) |
| FSR | Premera BCBS of Alaska (AK) |
| FSS | Unassigned Prefix |
| FST | Anthem BCBS of Connecticut (CT) |
| FSU | Anthem BCBS of Georgia (GA) |
| FSV | BCBS of Tennessee (TN) |
| FSW | BCBS of Illinois (IL) |
| FSX | BCBS of Louisiana(LA) |
| FSY | Unassigned Prefix |
| FSZ | Unassigned Prefix |
| FTA | Anthem Blue Cross(BC) of California (CA) |
| FTB | Anthem BCBS of Ohio (OH) |
| FTC | BCBS of Oklahoma (OK) |
| FTD | BCBS of Illinois (IL) |
| FTE | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FTF | Anthem BCBS of Georgia (GA) |
| FTG | Blue shield(BS) of California (CA) |
| FTH | Wellmark |
| FTI | Anthem BCBS of Connecticut (CT) |
| FTJ | Anthem BCBS of Virginia (VA) |
| FTK | Unassigned Prefix |
| FTL | Unassigned Prefix |
| FTM | Unassigned Prefix |
| FTN | Anthem BCBS of Ohio (OH) |
| FTO | Capital Blue Cross of Pennsylvania (PA) |
| FTP | Unassigned Prefix |
| FTQ | Anthem BCBS of Ohio (OH) |
| FTR | BCBS of Kansas City |
| FTS | Anthem BCBS of Kentucky (KY) |
| FTT | Blue shield(BS) of California (CA) |
| FTU | Unassigned Prefix |
| FTV | Wellmark |
| FTW | Unassigned Prefix |
| FTX | BCBS of Massachusetts (MA) |
| FTY | BCBS of Illinois (IL) |
| FTZ | Anthem BCBS of Virginia (VA) |
| FUA | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FUB | Anthem BCBS of Ohio (OH) |
| FUC | Unassigned Prefix |
| FUD | Unassigned Prefix |
| FUE | Anthem BCBS of Wisconsin (WI) |
| FUF | BCBS of South Carolina (SC) / Southcarolinablues |
| FUG | BCBS of Texas (TX) |
| FUH | Unassigned Prefix |
| FUI | Anthem BCBS of Indiana (IN) |
| FUJ | Unassigned Prefix |
| FUK | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FUL | Anthem BCBS of Missouri (MO) |
| FUM | Wellmark |
| FUN | BCBS of Illinois (IL) |
| FUO | Florida (FL) Blue |
| FUP | BCBS of South Carolina (SC) / Southcarolinablues |
| FUQ | Anthem BCBS of Georgia (GA) |
| FUR | Unassigned Prefix |
| FUS | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FUT | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FUU | Unassigned Prefix |
| FUV | BCBS of South Carolina (SC) / Southcarolinablues |
| FUW | Anthem Blue Cross(BC) of California (CA) |
| FUX | Unassigned Prefix |
| FUY | Anthem BCBS of Missouri (MO) |
| FUZ | Unassigned Prefix |
| FVA | Regence BCBS |
| FVB | BCBS of Tennessee (TN) |
| FVC | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| FVD | Unassigned Prefix |
| FVE | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FVF | Wellmark |
| FVG | Unassigned Prefix |
| FVH | Unassigned Prefix |
| FVI BCBS Prefix | Anthem BCBS of Virginia (VA) |
| FVJ | Unassigned Prefix |
| FVK | Unassigned Prefix |
| FVL | BCBS of Illinois (IL) |
| FVM | Anthem Blue Cross(BC) of California (CA) |
| FVN | BCBS Blue Care Network Michigan (MI) |
| FVO | Unassigned Prefix |
| FVP | Anthem BCBS of Virginia (VA) |
| FVQ | Unassigned Prefix |
| FVR | Unassigned Prefix |
| FVS | Blue shield(BS) of California (CA) |
| FVT | BCBS of Vermont (VT) |
| FVU | BCBS of Texas (TX) |
| FVV | BCBS Blue Care Network Michigan (MI) |
| FVW | Wellmark |
| FVX | BCBS of Illinois (IL) |
| FVY | Unassigned Prefix |
| FVZ | Unassigned Prefix |
| FWA | BCBS of Illinois (IL) |
| FWB | BCBS of Illinois (IL) |
| FWC | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| FWD | BCBS of Illinois (IL) |
| FWE | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FWF | BCBS of Illinois (IL) |
| FWG | Unassigned Prefix |
| FWH | BCBS of Minnesota (MN) |
| FWI | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FWJ | Anthem BCBS of Virginia (VA) |
| FWK | Unassigned Prefix |
| FWL | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FWM | BCBS of Illinois (IL) |
| FWN | Florida (FL) Blue |
| FWO | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FWP | Unassigned Prefix |
| FWQ | Unassigned Prefix |
| FWR | Anthem BCBS of Ohio (OH) |
| FWS | Wellmark |
| FWT | Arkansas (AR) Blue Cross |
| FWU | Unassigned Prefix |
| FWV | BCBS of Minnesota (MN) |
| FWW | Anthem BCBS of Ohio (OH) |
| FWX | Wellmark |
| FWY | BCBS of Illinois (IL) |
| FWZ | Anthem BCBS of Virginia (VA) |
| FXA | Anthem BCBS of Kentucky (KY) |
| FXB | Anthem Blue Cross(BC) of California (CA) |
| FXC | BCBS of Massachusetts (MA) |
| FXD | Anthem Blue Cross(BC) of California (CA) |
| FXE | Anthem BCBS of Ohio (OH) |
| FXF | Anthem Blue Cross(BC) of California (CA) |
| FXG | Anthem Blue Cross(BC) of California (CA) |
| FXH | BCBS of Tennessee (TN) |
| FXI | Anthem BCBS of Georgia (GA) |
| FXJ | Wellmark |
| FXK | Anthem Blue Cross(BC) of California (CA) |
| FXL | Anthem Blue Cross(BC) of California (CA) |
| FXM | Anthem Blue Cross(BC) of California (CA) |
| FXN | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FXO | Unassigned Prefix |
| FXP | Highmark BCBS of Pennsylvania (PA) |
| FXQ | Wellmark |
| FXR | BCBS of Illinois (IL) |
| FXS | BCBS of Texas (TX) |
| FXT | Unassigned Prefix |
| FXU | BCBS of Minnesota (MN) |
| FXV | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FXW | Anthem BCBS of Virginia (VA) |
| FXX | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FXY | BCBS of Tennessee (TN) |
| FXZ BCBS Prefix | Anthem Blue Cross(BC) of California (CA) |
| FYA | BCBS of Massachusetts (MA) |
| FYB | Unassigned Prefix |
| FYC | Unassigned Prefix |
| FYD | Anthem BCBS of Ohio (OH) |
| FYE | Unassigned Prefix |
| FYF | BCBS of Minnesota (MN) |
| FYG | Anthem BCBS of Virginia (VA) |
| FYH | BCBS of Western New York (WNY) |
| FYI | Unassigned Prefix |
| FYJ | Anthem BCBS of Virginia (VA) |
| FYK | Anthem BCBS of Indiana (IN) |
| FYL | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FYM | BCBS of Tennessee (TN) |
| FYN | Florida (FL) Blue |
| FYO | Highmark BCBS of Pennsylvania (PA) |
| FYP | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| FYQ | BCBS Blue Care Network Michigan (MI) |
| FYR | BCBS of Massachusetts (MA) |
| FYS | Wellmark |
| FYT | Unassigned Prefix |
| FYU | BCBS of Massachusetts (MA) |
| FYV | Unassigned Prefix |
| FYW | BCBS of Minnesota (MN) |
| FYX | Unassigned Prefix |
| FYY | Blue Cross (BC) of Idaho (ID) |
| FYZ | Florida (FL) Blue |
| FZA | BCBS of South Carolina (SC) / Southcarolinablues |
| FZB | Blue Cross (BC) of Idaho (ID) |
| FZC | Empire BCBS of New York (NY) |
| FZD | BCBS Blue Care Network Michigan (MI) |
| FZE | Anthem Blue Cross(BC) of California (CA) |
| FZF | Blue Cross (BC) of Idaho (ID) |
| FZG | Unassigned Prefix |
| FZH | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FZI | Unassigned Prefix |
| FZJ | Empire BCBS of New York (NY) |
| FZK | Unassigned Prefix |
| FZL | Unassigned Prefix |
| FZM | BCBS of Tennessee (TN) |
| FZN | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| FZO | Highmark BCBS of Pennsylvania (PA) |
| FZP | BCBS Blue Care Network Michigan (MI) |
| FZQ | Capital Blue Cross of Pennsylvania (PA) |
| FZR | BCBS of Arizona (AZ) |
| FZS | Unassigned Prefix |
| FZT | BCBS of Illinois (IL) |
| FZU | Florida (FL) Blue |
| FZV | Wellmark |
| FZW | Premera BCBS of Alaska (AK) |
| FZX | Anthem BCBS of Virginia (VA) |
| FZY | BCBS of North Carolina (NC) |
| FZZ | Wellmark |
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