| UAA | BCBS Blue Care Network Michigan (MI) |
| UAB | BCBS of Kansas City |
| UAC | BCBS Blue Care Network Michigan (MI) |
| UAD | Unassigned Prefix |
| UAE | Blue shield(BS) of California (CA) |
| UAF | Blue shield(BS) of California (CA) |
| UAG | BCBS of Texas (TX) |
| UAH | BCBS of Alabama (AL) |
| UAI | Unassigned Prefix |
| UAJ | Unassigned Prefix |
| UAK | Anthem BCBS of Connecticut (CT) |
| UAL BCBS Prefix | BCBS of Illinois (IL) |
| UAM | Highmark BCBS of Pennsylvania (PA) |
| UAN | Horizon BCBS of New Jersey (NJ) |
| UAO | BCBS Blue Care Network Michigan (MI) |
| UAP | Unassigned Prefix |
| UAQ | Blue shield(BS) of California (CA) |
| UAR | BCBS of Texas (TX) |
| UAS | Anthem Blue Cross(BC) of California (CA) |
| UAT | Anthem Blue Cross(BC) of California (CA) |
| UAU | BCBS Blue Care Network Michigan (MI) |
| UAV | Anthem Blue Cross(BC) of California (CA) |
| UAW | BCBS Blue Care Network Michigan (MI) |
| UAX | Empire BCBS of New York (NY) |
| UAY | BCBS Blue Care Network Michigan (MI) |
| UAZ | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| UBA | Anthem BCBS of Virginia (VA) |
| UBB | Anthem BCBS of Missouri (MO) |
| UBC | Anthem BCBS of Ohio (OH) |
| UBD | Anthem BCBS of Ohio (OH) |
| UBE | Unassigned Prefix |
| UBF | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| UBG | BCBS Blue Care Network Michigan (MI) |
| UBH | BCBS of Minnesota (MN) |
| UBI | Unassigned Prefix |
| UBJ | Unassigned Prefix |
| UBK | Unassigned Prefix |
| UBL | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| UBM | Anthem BCBS of Virginia (VA) |
| UBN | Unassigned Prefix |
| UBO | Blue shield(BS) of California (CA) |
| UBP | Wellmark |
| UBQ | Unassigned Prefix |
| UBR | Anthem BCBS of Kentucky (KY) |
| UBS | Blue shield(BS) of California (CA) |
| UBT | Unassigned Prefix |
| UBU | Anthem BCBS of Virginia (VA) |
| UBV | Wellmark |
| UBW | Unassigned Prefix |
| UBX | Wellmark |
| UBY | Unassigned Prefix |
| UBZ | Anthem BCBS of Indiana (IN) |
| UCA | Anthem BCBS of Ohio (OH) |
| UCB | Premera BCBS of Alaska (AK) |
| UCC | BCBS Blue Care Network Michigan (MI) |
| UCD | Unassigned Prefix |
| UCE | BCBS of Texas (TX) |
| UCF | Unassigned Prefix |
| UCG | BCBS of Massachusetts (MA) |
| UCH | BCBS of Kansas City |
| UCI | BCBS Blue Care Network Michigan (MI) |
| UCJ | Horizon BCBS of New Jersey (NJ) |
| UCK | BCBS Blue Care Network Michigan (MI) |
| UCL | Anthem BCBS of Colorado (CO) |
| UCM | Unassigned Prefix |
| UCN | BCBS of Alabama (AL) |
| UCO | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| UCP | Wellmark |
| UCQ | Anthem BCBS of Ohio (OH) |
| UCR BCBS Prefix | Anthem BCBS of Missouri (MO) |
| UCS | Regence BCBS |
| UCT | Unassigned Prefix |
| UCU | Unassigned Prefix |
| UCV | Unassigned Prefix |
| UCW | BCBS of Tennessee (TN) |
| UCX | Anthem BCBS of Ohio (OH) |
| UCY | Unassigned Prefix |
| UCZ | Unassigned Prefix |
| UDA | Premera BCBS of Alaska (AK) |
| UDB | Wellmark |
| UDC | BCBS Blue Care Network Michigan (MI) |
| UDD | BCBS Blue Care Network Michigan (MI) |
| UDE | Anthem BCBS of Indiana (IN) |
| UDF | Unassigned Prefix |
| UDG | Unassigned Prefix |
| UDH | BCBS of Illinois (IL) |
| UDI | Anthem BCBS of Nevada (NV) |
| UDJ | Unassigned Prefix |
| UDK | Unassigned Prefix |
| UDL | BCBS of Illinois (IL) |
| UDM | Highmark BCBS of Pennsylvania (PA) |
| UDN | Anthem BCBS of Wisconsin (WI) |
| UDO | Anthem BCBS of Ohio (OH) |
| UDP | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| UDQ | BCBS Blue Care Network Michigan (MI) |
| UDR | Anthem BCBS of Georgia (GA) |
| UDS | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| UDT | Anthem BCBS of Indiana (IN) |
| UDU | Unassigned Prefix |
| UDV | Premera BCBS of Alaska (AK) |
| UDW | Regence BCBS |
| UDX | BCBS Blue Care Network Michigan (MI) |
| UDY | Anthem BCBS of Indiana (IN) |
| UDZ | Unassigned Prefix |
| UEA | BCBS of Kansas City |
| UEB | BCBS of Massachusetts (MA) |
| UEC | Blue shield(BS) of California (CA) |
| UED | Wellmark |
| UEE | BCBS of Tennessee (TN) |
| UEF | Blue shield(BS) of California (CA) |
| UEG | Empire BCBS of New York (NY) |
| UEH | Anthem BCBS of Missouri (MO) |
| UEI | Anthem BCBS of Indiana (IN) |
| UEJ | BCBS of Illinois (IL) |
| UEK | Wellmark |
| UEL | BCBS of Massachusetts (MA) |
| UEM | BCBS of Massachusetts (MA) |
| UEN | BCBS of Massachusetts (MA) |
| UEO | Regence BCBS |
| UEP | Unassigned Prefix |
| UEQ | Anthem BCBS of Missouri (MO) |
| UER | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| UES | Empire BCBS of New York (NY) |
| UET | Anthem BCBS of Virginia (VA) |
| UEU | Unassigned Prefix |
| UEV | Unassigned Prefix |
| UEW | BCBS of Massachusetts (MA) |
| UEX | BCBS of Texas (TX) |
| UEY | Unassigned Prefix |
| UEZ | BCBS of Illinois (IL) |
| UFA | Anthem BCBS of Nevada (NV) |
| UFB | BCBS Blue Care Network Michigan (MI) |
| UFC | BCBS of Illinois (IL) |
| UFD | Horizon BCBS of New Jersey (NJ) |
| UFE | Unassigned Prefix |
| UFF | Anthem BCBS of Ohio (OH) |
| UFG | BCBS Blue Care Network Michigan (MI) |
| UFH | BCBS Blue Care Network Michigan (MI) |
| UFI | Anthem BCBS of Ohio (OH) |
| UFJ | BCBS Blue Care Network Michigan (MI) |
| UFK | BCBS Blue Care Network Michigan (MI) |
| UFL | BCBS Blue Care Network Michigan (MI) |
| UFM | Unassigned Prefix |
| UFN | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| UFO | Unassigned Prefix |
| UFP | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| UFQ | BCBS Blue Care Network Michigan (MI) |
| UFR | BCBS of Western New York (WNY) |
| UFS | Florida (FL) Blue |
| UFT | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| UFU | Excellus BCBS of New York (NY) |
| UFV | BCBS Blue Care Network Michigan (MI) |
| UFW | BCBS of Illinois (IL) |
| UFX | BCBS Blue Care Network Michigan (MI) |
| UFY | Wellmark |
| UFZ | Highmark BCBS of Pennsylvania (PA) |
| UGA | Florida (FL) Blue |
| UGB | Anthem Blue Cross(BC) of California (CA) |
| UGC | Horizon BCBS of New Jersey (NJ) |
| UGD BCBS Prefix | BCBS Blue Care Network Michigan (MI) |
| UGE | Unassigned Prefix |
| UGF | BCBS Blue Care Network Michigan (MI) |
| UGG BCBS Prefix | BCBS Blue Care Network Michigan (MI) |
| UGH | BCBS Blue Care Network Michigan (MI) |
| UGI | Unassigned Prefix |
| UGJ | Anthem Blue Cross(BC) of California (CA) |
| UGK | Anthem Blue Cross(BC) of California (CA) |
| UGL | Highmark BCBS of Pennsylvania (PA) |
| UGM | Unassigned Prefix |
| UGN | BCBS of Illinois (IL) |
| UGO | Anthem BCBS of Indiana (IN) |
| UGP | BCBS Blue Care Network Michigan (MI) |
| UGQ | Blue Cross (BC) of Idaho (ID) |
| UGR | Anthem BCBS of New Hampshire (NH) |
| UGS | Anthem BCBS of New Hampshire (NH) |
| UGT | BCBS of Alabama (AL) |
| UGU | BCBS of Tennessee (TN) |
| UGV | BCBS of Minnesota (MN) |
| UGW | Anthem Blue Cross(BC) of California (CA) |
| UGX | BCBS of Illinois (IL) |
| UGY | Horizon BCBS of New Jersey (NJ) |
| UGZ | BCBS Blue Care Network Michigan (MI) |
| UHA | Unassigned Prefix |
| UHB | Unassigned Prefix |
| UHC | BCBS Blue Care Network Michigan (MI) |
| UHD | Anthem BCBS of Ohio (OH) |
| UHE | BCBS of Arizona (AZ) |
| UHF | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| UHG | Unassigned Prefix |
| UHH | Wellmark |
| UHI | Anthem BCBS of Ohio (OH) |
| UHJ | BCBS Blue Care Network Michigan (MI) |
| UHK | Anthem BCBS of Ohio (OH) |
| UHL | BCBS of Arizona (AZ) |
| UHM | BCBS of Massachusetts (MA) |
| UHN | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| UHO | BCBS of Illinois (IL) |
| UHP | BCBS of Alabama (AL) |
| UHQ | Anthem BCBS of Ohio (OH) |
| UHR | Highmark BCBS of Pennsylvania (PA) |
| UHS | BCBS of Illinois (IL) |
| UHT | Anthem BCBS of Ohio (OH) |
| UHU | Anthem BCBS of Indiana (IN) |
| UHV | Anthem BCBS of Indiana (IN) |
| UHW | BCBS of Illinois (IL) |
| UHX | BCBS of Minnesota (MN) |
| UHY | Blue shield(BS) of Northeastern New York (NeNY) |
| UHZ | Blue shield(BS) of Northeastern New York (NeNY) |
| UIA | Unassigned Prefix |
| UIB | Unassigned Prefix |
| UIC | BCBS Blue Care Network Michigan (MI) |
| UID | Blue Cross (BC) of Idaho (ID) |
| UIE | BCBS Blue Care Network Michigan (MI) |
| UIF | Florida (FL) Blue |
| UIG | Excellus BCBS of New York (NY) |
| UIH | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| UII | BCBS Blue Care Network Michigan (MI) |
| UIJ | Anthem BCBS of Georgia (GA) |
| UIK | Anthem BCBS of Georgia (GA) |
| UIL | BCBS Blue Care Network Michigan (MI) |
| UIM | Premera BCBS of Alaska (AK) |
| UIN | BCBS Blue Care Network Michigan (MI) |
| UIO | BCBS Blue Care Network Michigan (MI) |
| UIP | Anthem Blue Cross(BC) of California (CA) |
| UIQ | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| UIR | BCBS Blue Care Network Michigan (MI) |
| UIS | Unassigned Prefix |
| UIT | Anthem BCBS of Colorado (CO) |
| UIU | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| UIV | Premera BCBS of Alaska (AK) |
| UIW | BCBS Blue Care Network Michigan (MI) |
| UIX | Horizon BCBS of New Jersey (NJ) |
| UIY | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| UIZ | Unassigned Prefix |
| UJA | Anthem BCBS of Connecticut (CT) |
| UJB | Anthem BCBS of Missouri (MO) |
| UJC | BCBS of Illinois (IL) |
| UJD | Premera BCBS of Alaska (AK) |
| UJE | Unassigned Prefix |
| UJF | BCBS of Alabama (AL) |
| UJG | BCBS of Oklahoma (OK) |
| UJH | BCBS of Illinois (IL) |
| UJI | Anthem BCBS of Wisconsin (WI) |
| UJJ | Anthem BCBS of Wisconsin (WI) |
| UJK | Unassigned Prefix |
| UJL | Unassigned Prefix |
| UJM | Anthem BCBS of Wisconsin (WI) |
| UJN | Anthem BCBS of New Hampshire (NH) |
| UJO | Anthem BCBS of Ohio (OH) |
| UJP | BCBS of Illinois (IL) |
| UJQ | BCBS of Texas (TX) |
| UJR | Regence BCBS |
| UJS | Highmark BCBS of Pennsylvania (PA) |
| UJT | Regence BCBS |
| UJU | Unassigned Prefix |
| UJV | Unassigned Prefix |
| UJW | Unassigned Prefix |
| UJX | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| UJY | Anthem BCBS of Wisconsin (WI) |
| UJZ | Anthem BCBS of Wisconsin (WI) |
| UKA | Unassigned Prefix |
| UKB | BCBS of Massachusetts (MA) |
| UKC | BCBS of Oklahoma (OK) |
| UKD | BCBS of Oklahoma (OK) |
| UKE | Anthem Blue Cross(BC) of California (CA) |
| UKF | Unassigned Prefix |
| UKG | Unassigned Prefix |
| UKH | Empire BCBS of New York (NY) |
| UKI | Anthem BCBS of Georgia (GA) |
| UKJ | Empire BCBS of New York (NY) |
| UKK | Unassigned Prefix |
| UKL | BCBS of Texas (TX) |
| UKM | Unassigned Prefix |
| UKN | Blue Cross (BC) of Idaho (ID) |
| UKO | Wellmark |
| UKP | Unassigned Prefix |
| UKQ | Premera Blue Cross (BC) of Alaska (AK) |
| UKR | Unassigned Prefix |
| UKS | Anthem BCBS of Missouri (MO) |
| UKT | Anthem Blue Cross(BC) of California (CA) |
| UKU | BCBS of Tennessee (TN) |
| UKV | Unassigned Prefix |
| UKW | BCBS of Massachusetts (MA) |
| UKX | BCBS of Nebraska (NE) |
| UKY | Anthem BCBS of Ohio (OH) |
| UKZ | Unassigned Prefix |
| ULA | Anthem BCBS of Colorado (CO) |
| ULB | Anthem BCBS of Ohio (OH) |
| ULC | Anthem BCBS of Ohio (OH) |
| ULD | Premera BCBS of Alaska (AK) |
| ULE | BCBS of Illinois (IL) |
| ULF | BCBS of Illinois (IL) |
| ULG | Unassigned Prefix |
| ULH | Anthem BCBS of Kentucky (KY) |
| ULI | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| ULJ | BCBS Blue Care Network Michigan (MI) |
| ULK | BCBS of Western New York (WNY) |
| ULL | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| ULM | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| ULN | BCBS of Kansas City |
| ULO | BCBS Blue Care Network Michigan (MI) |
| ULP | BCBS of Alabama (AL) |
| ULQ | Anthem BCBS of Ohio (OH) |
| ULR | Anthem BCBS of Georgia (GA) |
| ULS | Anthem BCBS of Ohio (OH) |
| ULT | BCBS of Illinois (IL) |
| ULU | Anthem BCBS of Ohio (OH) |
| ULV | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| ULW | Wellmark |
| ULX | Unassigned Prefix |
| ULY | BCBS of Illinois (IL) |
| ULZ | BCBS of Tennessee (TN) |
| UMA | BCBS of Massachusetts (MA) |
| UMB | Blue Cross (BC) of Idaho (ID) |
| UMC | BCBS of Minnesota (MN) |
| UMD | Highmark BCBS of Pennsylvania (PA) |
| UME | Florida (FL) Blue |
| UMF | BCBS of Illinois (IL) |
| UMG | Anthem Blue Cross(BC) of California (CA) |
| UMH | Anthem BCBS of Ohio (OH) |
| UMI | BCBS of Massachusetts (MA) |
| UMJ | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| UMK | BCBS Blue Care Network Michigan (MI) |
| UML | BCBS Blue Care Network Michigan (MI) |
| UMM | Anthem BCBS of Virginia (VA) |
| UMN | BCBS Blue Care Network Michigan (MI) |
| UMO | Anthem Blue Cross(BC) of California (CA) |
| UMP | Unassigned Prefix |
| UMQ | Anthem BCBS of Nevada (NV) |
| UMR | Premera BCBS of Alaska (AK) |
| UMS | BCBS Blue Care Network Michigan (MI) |
| UMT | BCBS Blue Care Network Michigan (MI) |
| UMU | BCBS Blue Care Network Michigan (MI) |
| UMV | BCBS Blue Care Network Michigan (MI) |
| UMW | BCBS Blue Care Network Michigan (MI) |
| UMX | Premera BCBS of Alaska (AK) |
| UMY | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| UMZ | Premera BCBS of Alaska (AK) |
| UNA | Anthem BCBS of Wisconsin (WI) |
| UNB | BCBS of Nebraska (NE) |
| UNC | BCBS Blue Care Network Michigan (MI) |
| UND | Unassigned Prefix |
| UNE | Unassigned Prefix |
| UNF | BCBS of Arizona (AZ) |
| UNG | BCBS of North Carolina (NC) |
| UNH | Unassigned Prefix |
| UNI | Anthem BCBS of Wisconsin (WI) |
| UNJ | Anthem BCBS of Indiana (IN) |
| UNK | BCBS of Tennessee (TN) |
| UNL | Anthem Blue Cross(BC) of California (CA) |
| UNM | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| UNN | Premera BCBS of Alaska (AK) |
| UNO | Unassigned Prefix |
| UNP | BCBS Blue Care Network Michigan (MI) |
| UNQ | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| UNR | Anthem Blue Cross(BC) of California (CA) |
| UNS | Blue Cross (BC) of Vermont (VT) |
| UNT | Blue Cross (BC) of Vermont (VT) |
| UNU | Empire BCBS of New York (NY) |
| UNV | Anthem BCBS of Ohio (OH) |
| UNW | Florida (FL) Blue |
| UNX | Anthem BCBS of Connecticut (CT) |
| UNY | Unassigned Prefix |
| UNZ | Empire BCBS of New York (NY) |
| UOA | Unassigned Prefix |
| UOB | Wellmark |
| UOC | BCBS of Illinois (IL) |
| UOD | Unassigned Prefix |
| UOE | BCBS of Illinois (IL) |
| UOF | BCBS Blue Care Network Michigan (MI) |
| UOG | Horizon BCBS of New Jersey (NJ) |
| UOH | Premera BCBS of Alaska (AK) |
| UOI | Blue Cross (BC) of Idaho (ID) |
| UOJ | Unassigned Prefix |
| UOK | Unassigned Prefix |
| UOL | Unassigned Prefix |
| UOM | BCBS Blue Care Network Michigan (MI) |
| UON | Wellmark |
| UOO | BCBS Blue Care Network Michigan (MI) |
| UOP | Anthem BCBS of Ohio (OH) |
| UOQ | Horizon BCBS of New Jersey (NJ) |
| UOR | Unassigned Prefix |
| UOS | Unassigned Prefix |
| UOT | Blue shield(BS) of California (CA) |
| UOU | Regence BCBS |
| UOV | Unassigned Prefix |
| UOW | Unassigned Prefix |
| UOX | Anthem BCBS of Ohio (OH) |
| UOY | BCBS Blue Care Network Michigan (MI) |
| UOZ | Highmark BCBS of Pennsylvania (PA) |
| UPA | BCBS of Illinois (IL) |
| UPB | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| UPC | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| UPD | Anthem BCBS of Wisconsin (WI) |
| UPE | Unassigned Prefix |
| UPF | Wellmark |
| UPG | Anthem BCBS of Ohio (OH) |
| UPH | BCBS of Illinois (IL) |
| UPI | BCBS of Alabama (AL) |
| UPJ | Premera BCBS of Alaska (AK) |
| UPK | Unassigned Prefix |
| UPL | Unassigned Prefix |
| UPM | BCBS of Rhode Island (RI) |
| UPN | Unassigned Prefix |
| UPO | Blue shield(BS) of Northeastern New York (NeNY) |
| UPP | BCBS of Texas (TX) |
| UPQ | BCBS of Western New York (WNY) |
| UPR | Unassigned Prefix |
| UPS | Wellmark |
| UPT | BCBS of Illinois (IL) |
| UPU | Unassigned Prefix |
| UPV | Unassigned Prefix |
| UPW | Anthem BCBS of Nevada (NV) |
| UPX | BCBS of Texas (TX) |
| UPY | BCBS of Alabama (AL) |
| UPZ | Blue shield(BS) of California (CA) |
| UQA | BCBS of Western New York (WNY) |
| UQB | Wellmark |
| UQC | Unassigned Prefix |
| UQD | Wellmark |
| UQE | Anthem BCBS of Wisconsin (WI) |
| UQF | Unassigned Prefix |
| UQG | Unassigned Prefix |
| UQH | Unassigned Prefix |
| UQI | Unassigned Prefix |
| UQJ | Unassigned Prefix |
| UQK BCBS Prefix | Anthem BCBS of Connecticut (CT) |
| UQL | Unassigned Prefix |
| UQM | Anthem BCBS of Kentucky (KY) |
| UQN | Unassigned Prefix |
| UQO | Regence BCBS |
| UQP | Anthem BCBS of Ohio (OH) |
| UQQ | BCBS Blue Care Network Michigan (MI) |
| UQR | Unassigned Prefix |
| UQS | Unassigned Prefix |
| UQT | BCBS of Western New York (WNY) |
| UQU | BCBS Blue Care Network Michigan (MI) |
| UQV | Anthem BCBS of Ohio (OH) |
| UQW | Horizon BCBS of New Jersey (NJ) |
| UQX | BCBS of South Carolina (SC) / Southcarolinablues |
| UQY | BCBS of Rhode Island (RI) |
| UQZ | BCBS of Rhode Island (RI) |
| URA | BCBS of Illinois (IL) |
| URB | Unassigned Prefix |
| URC | Unassigned Prefix |
| URD | Unassigned Prefix |
| URE | BCBS of Texas (TX) |
| URF | Unassigned Prefix |
| URG | Unassigned Prefix |
| URH | Unassigned Prefix |
| URI | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| URJ | Anthem BCBS of Nevada (NV) |
| URK | BCBS of Illinois (IL) |
| URL | Excellus BCBS of New York (NY) |
| URM | Unassigned Prefix |
| URN | BCBS of Illinois (IL) |
| URO | BCBS Blue Care Network Michigan (MI) |
| URP | BCBS Blue Care Network Michigan (MI) |
| URQ | Highmark BCBS of Pennsylvania (PA) |
| URR | BCBS of South Carolina (SC) / Southcarolinablues |
| URS | Blue shield(BS) of California (CA) |
| URT | Blue shield(BS) of California (CA) |
| URU | BCBS Blue Care Network Michigan (MI) |
| URV | BCBS of Illinois (IL) |
| URW | Wellmark |
| URX | BCBS of Minnesota (MN) |
| URY | Anthem BCBS of Georgia (GA) |
| URZ | Unassigned Prefix |
| USA | Anthem Blue Cross(BC) of California (CA) |
| USB | Regence BCBS |
| USC | Unassigned Prefix |
| USD | Unassigned Prefix |
| USE | BCBS of Texas (TX) |
| USF | Unassigned Prefix |
| USG | BCBS of Tennessee (TN) |
| USH | BCBS of Alabama (AL) |
| USI | Unassigned Prefix |
| USJ | Empire BCBS of New York (NY) |
| USK | BCBS of South Carolina (SC) / Southcarolinablues |
| USL | Unassigned Prefix |
| USM | Blue shield(BS) of California (CA) |
| USN | BCBS of Tennessee (TN) |
| USO | Florida (FL) Blue |
| USP | Anthem BCBS of Ohio (OH) |
| USQ Anthem BCBS of Ohio (OH) |
| USR | Excellus BCBS of New York (NY) |
| USS | BCBS of North Carolina (NC) |
| UST | BCBS of Illinois (IL) |
| USU | Empire BCBS of New York (NY) |
| USV | Anthem BCBS of Ohio (OH) |
| USW | Highmark BCBS of Pennsylvania (PA) |
| USX | Empire BCBS of New York (NY) |
| USY | BCBS of South Carolina (SC) / Southcarolinablues |
| USZ | Unassigned Prefix |
| UTA | Anthem BCBS of Ohio (OH) |
| UTB | Anthem BCBS of Virginia (VA) |
| UTC | Blue Cross (BC) of Idaho (ID) |
| UTD | BCBS of Illinois (IL) |
| UTE | Unassigned Prefix |
| UTF | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| UTG | Anthem BCBS of Ohio (OH) |
| UTH | Unassigned Prefix |
| UTI | Unassigned Prefix |
| UTJ | Unassigned Prefix |
| UTK | BCBS of Arizona (AZ) |
| UTL | BCBS of Illinois (IL) |
| UTM | Anthem Blue Cross(BC) of California (CA) |
| UTN | BCBS of Illinois (IL) |
| UTO | Blue shield(BS) of California (CA) |
| UTP | Unassigned Prefix |
| UTQ | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| UTR | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| UTS BCBS Prefix | BCBS of Texas (TX) |
| UTT | Anthem BCBS of Ohio (OH) |
| UTU | Anthem BCBS of Georgia (GA) |
| UTV | BCBS of Illinois (IL) |
| UTW | Unassigned Prefix |
| UTX | Anthem BCBS of Connecticut (CT) |
| UTY | BCBS of Texas (TX) |
| UTZ | BCBS of Tennessee (TN) |
| UUA | Anthem BCBS of Georgia (GA) |
| UUB | Unassigned Prefix |
| UUC | BCBS of Oklahoma (OK) |
| UUD | Unassigned Prefix |
| UUE | Blue shield(BS) of California (CA) |
| UUF | BCBS of Illinois (IL) |
| UUG | Regence BCBS |
| UUH | Anthem BCBS of Missouri (MO) |
| UUI | BCBS of North Carolina (NC) |
| UUJ | Unassigned Prefix |
| UUK | Regence BCBS |
| UUL | BCBS of Tennessee (TN) |
| UUM | Unassigned Prefix |
| UUN | Unassigned Prefix |
| UUO | BCBS Blue Care Network Michigan (MI) |
| UUP | Anthem BCBS of Virginia (VA) |
| UUQ | Unassigned Prefix |
| UUR | Unassigned Prefix |
| UUS | Blue shield(BS) of California (CA) |
| UUT | Unassigned Prefix |
| UUU | Unassigned Prefix |
| UUV | Unassigned Prefix |
| UUW | Unassigned Prefix |
| UUX | BCBS of Illinois (IL) |
| UUY | Unassigned Prefix |
| UUZ | BCBS Blue Care Network Michigan (MI) |
| UVA | Anthem BCBS of Virginia (VA) |
| UVB | Anthem BCBS of Indiana (IN) |
| UVC | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| UVD | Anthem BCBS of Virginia (VA) |
| UVE | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| UVF | BCBS of Kansas City |
| UVG | Wellmark |
| UVH | Unassigned Prefix |
| UVI | BCBS Blue Care Network Michigan (MI) |
| UVJ | Unassigned Prefix |
| UVK | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| UVL | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| UVM | Unassigned Prefix |
| UVN | Unassigned Prefix |
| UVO | Unassigned Prefix |
| UVP | BCBS of Illinois (IL) |
| UVQ | Unassigned Prefix |
| UVR | Unassigned Prefix |
| UVS | BCBS of Illinois (IL) |
| UVT | Anthem BCBS of Virginia (VA) |
| UVU | BCBS of Alabama (AL) |
| UVV | Wellmark |
| UVW | Empire BCBS of New York (NY) |
| UVX | Unassigned Prefix |
| UVY | Anthem Blue Cross(BC) of California (CA) |
| UVZ | BCBS of Texas (TX) |
| UWA | BCBS Blue Care Network Michigan (MI) |
| UWB | Unassigned Prefix |
| UWC | Anthem BCBS of Wisconsin (WI) |
| UWD | Anthem Blue Cross(BC) of California (CA) |
| UWE | Anthem BCBS of Ohio (OH) |
| UWF | BCBS Blue Care Network Michigan (MI) |
| UWG | BCBS Blue Care Network Michigan (MI) |
| UWH | Anthem BCBS of Ohio (OH) |
| UWI | Unassigned Prefix |
| UWJ | Unassigned Prefix |
| UWK | Unassigned Prefix |
| UWL | Unassigned Prefix |
| UWM | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| UWN | BCBS of Illinois (IL) |
| UWO | Unassigned Prefix |
| UWP | BCBS of Rhode Island (RI) |
| UWQ | Empire BCBS of New York (NY) |
| UWR | Unassigned Prefix |
| UWS | Anthem BCBS of Connecticut (CT) |
| UWT | Horizon BCBS of New Jersey (NJ) |
| UWU | BCBS of Tennessee (TN) |
| UWV | Unassigned Prefix |
| UWW | BCBS Blue Care Network Michigan (MI) |
| UWX | BCBS of Rhode Island (RI) |
| UWY | Unassigned Prefix |
| UWZ | Unassigned Prefix |
| UXA | Unassigned Prefix |
| UXB | BCBS of Alabama (AL) |
| UXC | Anthem Blue Cross(BC) of California (CA) |
| UXD | BCBS of South Carolina (SC) / Southcarolinablues |
| UXE | BCBS of Tennessee (TN) |
| UXF | Anthem Blue Cross(BC) of California (CA) |
| UXG | BCBS Blue Care Network Michigan (MI) |
| UXH | Wellmark |
| UXI | Horizon BCBS of New Jersey (NJ) |
| UXJ | BCBS of Illinois (IL) |
| UXK | Unassigned Prefix |
| UXL | Highmark BCBS of Pennsylvania (PA) |
| UXM | BCBS of Illinois (IL) |
| UXN | Blue shield(BS) of California (CA) |
| UXO | BCBS Blue Care Network Michigan (MI) |
| UXP | Unassigned Prefix |
| UXQ | Anthem BCBS of Missouri (MO) |
| UXR | Wellmark |
| UXS | Premera BCBS of Alaska (AK) |
| UXT | Anthem BCBS of Georgia (GA) |
| UXU | BCBS of Illinois (IL) |
| UXV | Anthem BCBS of Missouri (MO) |
| UXW | Horizon BCBS of New Jersey (NJ) |
| UXX | BCBS Blue Care Network Michigan (MI) |
| UXY | Anthem BCBS of Missouri (MO) |
| UXZ | Anthem BCBS of Missouri (MO) |
| UYA | BCBS of Illinois (IL) |
| UYB | Anthem BCBS of Indiana (IN) |
| UYC | Empire BCBS of New York (NY) |
| UYD | Unassigned Prefix |
| UYE | BCBS of Massachusetts (MA) |
| UYF | Anthem Blue Cross(BC) of California (CA) |
| UYG | Anthem BCBS of Virginia (VA) |
| UYH | Anthem BCBS of Indiana (IN) |
| UYI | BCBS Blue Care Network Michigan (MI) |
| UYJ | Regence BCBS |
| UYK | Anthem BCBS of Georgia (GA) |
| UYL | BCBS of Illinois (IL) |
| UYM | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| UYN | Unassigned Prefix |
| UYO | Anthem BCBS of Georgia (GA) |
| UYP | Unassigned Prefix |
| UYQ | BCBS of Louisiana(LA) |
| UYR | Unassigned Prefix |
| UYS | Unassigned Prefix |
| UYT | Unassigned Prefix |
| UYU | BCBS of Arizona (AZ) |
| UYV | Wellmark |
| UYW | BCBS Blue Care Network Michigan (MI) |
| UYX | Unassigned Prefix |
| UYY | Anthem BCBS of Kentucky (KY) |
| UYZ | Blue Cross (BC) of Idaho (ID) |
| UZA | Unassigned Prefix |
| UZB | Wellmark |
| UZC | Anthem Blue Cross(BC) of California (CA) |
| UZD | Blue shield(BS) of California (CA) |
| UZE | Highmark BCBS of Pennsylvania (PA) |
| UZF | Unassigned Prefix |
| UZG | BCBS Blue Care Network Michigan (MI) |
| UZH | Wellmark |
| UZI | Unassigned Prefix |
| UZJ | Unassigned Prefix |
| UZK | Wellmark |
| UZL | Unassigned Prefix |
| UZM | BCBS of Louisiana(LA) |
| UZN | Florida (FL) Blue |
| UZO | Anthem BCBS of Georgia (GA) |
| UZP | Anthem Blue Cross(BC) of California (CA) |
| UZQ | Anthem BCBS of Connecticut (CT) |
| UZR | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| UZS | BCBS of Texas (TX) |
| UZT | Anthem BCBS of Colorado (CO) |
| UZU | Unassigned Prefix |
| UZV | BCBS Blue Care Network Michigan (MI) |
| UZW | BCBS Blue Care Network Michigan (MI) |
| UZX | Unassigned Prefix |
| UZY | BCBS Blue Care Network Michigan (MI) |
| UZZ | BCBS of Texas (TX) |
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