| WAA | BCBS of Alabama (AL) |
| WAB | BCBS of Illinois (IL) |
| WAC | Regence BCBS |
| WAD | Florida (FL) Blue |
| WAE | BCBS of Texas (TX) |
| WAF | Premera BCBS of Alaska (AK) |
| WAG BCBS Prefix | BCBS of Illinois (IL) |
| WAH | Premera BCBS of Alaska (AK) |
| WAI | Regence BCBS |
| WAJ | Florida (FL) Blue |
| WAK | Wellmark |
| WAL | BCBS of Massachusetts (MA) |
| WAM | Highmark BCBS of Pennsylvania (PA) |
| WAN | BCBS Blue Care Network Michigan (MI) |
| WAO | Blue shield(BS) of California (CA) |
| WAP | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| WAQ | Florida (FL) Blue |
| WAR | Unassigned Prefix |
| WAS | Unassigned Prefix |
| WAT | BCBS of Rhode Island (RI) |
| WAU | Wellmark |
| WAV | BCBS of Massachusetts (MA) |
| WAW | BCBS of Massachusetts (MA) |
| WAX | Premera BCBS of Alaska (AK) |
| WAY | Horizon BCBS of New Jersey (NJ) |
| WAZ | Premera BCBS of Alaska (AK) |
| WBA | BCBS of Illinois (IL) |
| WBB | Blue shield(BS) of California (CA) |
| WBC | Anthem BCBS of Virginia (VA) |
| WBD | BCBS of South Carolina (SC) / Southcarolinablues |
| WBE | Blue Cross (BC) of Idaho (ID) |
| WBF | Highmark BCBS of Pennsylvania (PA) |
| WBG | Regence BCBS |
| WBH | Anthem BCBS of Ohio (OH) |
| WBI | Anthem BCBS of Ohio (OH) |
| WBJ | Premera BCBS of Alaska (AK) |
| WBK | BCBS of North Carolina (NC) |
| WBL | Anthem BCBS of Kentucky (KY) |
| WBM | Wellmark |
| WBN | Anthem BCBS of Indiana (IN) |
| WBO | BCBS of Oklahoma (OK) |
| WBP | Regence BCBS |
| WBQ | BCBS Blue Care Network Michigan (MI) |
| WBR | Unassigned Prefix |
| WBS | Wellmark |
| WBT | Anthem BCBS of Ohio (OH) |
| WBU | BCBS Blue Care Network Michigan (MI) |
| WBV | BCBS of Texas (TX) |
| WBW | Anthem BCBS of Georgia (GA) |
| WBX | Blue shield(BS) of Northeastern New York (NeNY) |
| WBY | BCBS of Minnesota (MN) |
| WBZ | Anthem BCBS of Wisconsin (WI) |
| WCA | Anthem BCBS of Missouri (MO) |
| WCB | Wellmark |
| WCC | BCBS of Illinois (IL) |
| WCD | BCBS of Minnesota (MN) |
| WCE | Anthem Blue Cross(BC) of California (CA) |
| WCF | Unassigned Prefix |
| WCG | Anthem BCBS of Ohio (OH) |
| WCH | BCBS of Massachusetts (MA) |
| WCI | Anthem BCBS of Wisconsin (WI) |
| WCJ | Unassigned Prefix |
| WCK | BCBS of Massachusetts (MA) |
| WCL | Premera BCBS of Alaska (AK) |
| WCM | Highmark BCBS of Pennsylvania (PA) |
| WCN | Regence BCBS |
| WCO | Capital Blue Cross of Pennsylvania (PA) |
| WCP | Regence BCBS |
| WCQ | Wellmark |
| WCR | Unassigned Prefix |
| WCS | Anthem BCBS of Ohio (OH) |
| WCT | Unassigned Prefix |
| WCU | Anthem Blue Cross(BC) of California (CA) |
| WCV | BCBS of Massachusetts (MA) |
| WCW | Blue shield(BS) of California (CA) |
| WCX | Wellmark |
| WCY | Regence BCBS |
| WCZ | Blue Cross (BC) of Idaho (ID) |
| WDA | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| WDB | Anthem BCBS of Virginia (VA) |
| WDC | Unassigned Prefix |
| WDD | Arkansas (AR) Blue Cross |
| WDE | BCBS of Alabama (AL) |
| WDF | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| WDG | Blue shield(BS) of California (CA) |
| WDH | Wellmark |
| WDI | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| WDJ | Unassigned Prefix |
| WDK | Unassigned Prefix |
| WDL | Unassigned Prefix |
| WDM | BCBS of Nebraska (NE) |
| WDN | Unassigned Prefix |
| WDO | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| WDP | Unassigned Prefix |
| WDQ | Anthem BCBS of Ohio (OH) |
| WDR | Unassigned Prefix |
| WDS | Florida (FL) Blue |
| WDT | Unassigned Prefix |
| WDU | Blue shield(BS) of California (CA) |
| WDV | Unassigned Prefix |
| WDW | Unassigned Prefix |
| WDX | Anthem BCBS of Virginia (VA) |
| WDY | Unassigned Prefix |
| WDZ | Unassigned Prefix |
| WEA | Anthem BCBS of Georgia (GA) |
| WEB | Unassigned Prefix |
| WEC | BCBS of Minnesota (MN) |
| WED | Unassigned Prefix |
| WEE | Wellmark |
| WEF | BCBS of Minnesota (MN) |
| WEG | BCBS of Texas (TX) |
| WEH | Wellmark |
| WEI | Wellmark |
| WEJ | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| WEK | Wellmark |
| WEL | BCBS of Massachusetts (MA) |
| WEM | Anthem Blue Cross(BC) of California (CA) |
| WEN | Unassigned Prefix |
| WEO | Blue Advantage of Arkansas (AR) |
| WEP | Anthem Blue Cross(BC) of California (CA) |
| WEQ | BCBS of Nebraska (NE) |
| WER | Unassigned Prefix |
| WES | Arkansas (AR) Blue Cross |
| WET | Anthem Blue Cross(BC) of California (CA) |
| WEU | Unassigned Prefix |
| WEV | BCBS of Western New York (WNY) |
| WEW | Unassigned Prefix |
| WEX | Unassigned Prefix |
| WEY | Unassigned Prefix |
| WEZ | Unassigned Prefix |
| WFA | Highmark BCBS of Pennsylvania (PA) |
| WFB | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| WFC | Blue Cross (BC) of Idaho (ID) |
| WFD | Anthem Blue Cross(BC) of California (CA) |
| WFE | Regence BCBS |
| WFF | Unassigned Prefix |
| WFG | Regence BCBS |
| WFH | Anthem BCBS of Missouri (MO) |
| WFI | Empire BCBS of New York (NY) |
| WFJ | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| WFK | Unassigned Prefix |
| WFL | Anthem BCBS of Georgia (GA) |
| WFM | Excellus BCBS of New York (NY) |
| WFN | Unassigned Prefix |
| WFO | BCBS of Tennessee (TN) |
| WFP | Unassigned Prefix |
| WFQ BCBS Prefix | Anthem BCBS of Indiana (IN) |
| WFR | Unassigned Prefix |
| WFS | Empire BCBS of New York (NY) |
| WFT | Premera BCBS of Alaska (AK) |
| WFU | BCBS of South Carolina (SC) / Southcarolinablues |
| WFV | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| WFW | Highmark BCBS of Pennsylvania (PA) |
| WFX | Premera BCBS of Alaska (AK) |
| WFY | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| WFZ | Excellus BCBS of New York (NY) |
| WGA | Unassigned Prefix |
| WGB | Blue Cross (BC) of Idaho (ID) |
| WGC | BCBS of Massachusetts (MA) |
| WGD | Unassigned Prefix |
| WGE | BCBS of Alabama (AL) |
| WGF | Anthem Blue Cross(BC) of California (CA) |
| WGG | Unassigned Prefix |
| WGH | Wellmark |
| WGI | BCBS Blue Care Network Michigan (MI) |
| WGJ | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| WGK | Unassigned Prefix |
| WGL | Anthem BCBS of Georgia (GA) |
| WGM | Unassigned Prefix |
| WGN | Excellus BCBS of New York (NY) |
| WGO | Blue shield(BS) of California (CA) |
| WGP | Wellmark |
| WGQ | Anthem BCBS of New Hampshire (NH) |
| WGR | Wellmark |
| WGS | Unassigned Prefix |
| WGT | BCBS of Western New York (WNY) |
| WGU | Unassigned Prefix |
| WGV | Unassigned Prefix |
| WGW | Anthem BCBS of Missouri (MO) |
| WGX | Arkansas (AR) Blue Cross |
| WGY | Unassigned Prefix |
| WGZ | BCBS of Illinois (IL) |
| WHA | Anthem BCBS of Virginia (VA) |
| WHB | BCBS of Massachusetts (MA) |
| WHC | BCBS Blue Care Network Michigan (MI) |
| WHD | BCBS Blue Care Network Michigan (MI) |
| WHE | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| WHF | Wellmark |
| WHG | Blue Cross (BC) of Idaho (ID) |
| WHH | Wellmark |
| WHI | Empire BCBS of New York (NY) |
| WHJ | BCBS of Massachusetts (MA) |
| WHK | Anthem BCBS of Virginia (VA) |
| WHL | BCBS of Western New York (WNY) |
| WHM | Blue Advantage of Arkansas (AR) |
| WHN | BCBS Blue Care Network Michigan (MI) |
| WHO | BCBS Blue Care Network Michigan (MI) |
| WHP | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| WHQ | Highmark BCBS of Pennsylvania (PA) |
| WHR | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| WHS | BCBS of Illinois (IL) |
| WHT | BCBS of Massachusetts (MA) |
| WHU | Wellmark |
| WHV | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| WHW | BCBS of Minnesota (MN) |
| WHX | BCBS of Massachusetts (MA) |
| WHY | Anthem BCBS of Indiana (IN) |
| WHZ | Anthem BCBS of Georgia (GA) |
| WIA | Anthem BCBS of Virginia (VA) |
| WIB | BCBS of South Carolina (SC) / Southcarolinablues |
| WIC | Unassigned Prefix |
| WID | BCBS Blue Care Network Michigan (MI) |
| WIE | Arkansas (AR) Blue Cross |
| WIF | BCBS of North Carolina (NC) |
| WIG | Anthem BCBS of Wisconsin (WI) |
| WIH | Premera Blue Cross (BC) of Alaska (AK) |
| WII | Unassigned Prefix |
| WIJ | Anthem BCBS of Georgia (GA) |
| WIK | Blue shield(BS) of California (CA) |
| WIL | BCBS of Alabama (AL) |
| WIM | Blue shield(BS) of California (CA) |
| WIN | Wellmark |
| WIO | Blue shield(BS) of California (CA) |
| WIP | Regence BCBS |
| WIQ | Anthem BCBS of Georgia (GA) |
| WIR | Unassigned Prefix |
| WIS | Unassigned Prefix |
| WIT | Unassigned Prefix |
| WIU | Anthem BCBS of Wisconsin (WI) |
| WIV | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| WIW | Anthem BCBS of Georgia (GA) |
| WIX | Anthem BCBS of Georgia (GA) |
| WIY | BCBS of Kansas City |
| WIZ | Unassigned Prefix |
| WJA | Premera BCBS of Alaska (AK) |
| WJB | Unassigned Prefix |
| WJC | Unassigned Prefix |
| WJD | Anthem BCBS of Georgia (GA) |
| WJE | Anthem BCBS of Indiana (IN) |
| WJF | BCBS of Illinois (IL) |
| WJG | BCBS of Massachusetts (MA) |
| WJH | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| WJI | Highmark BCBS of Pennsylvania (PA) |
| WJJ | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| WJK | Capital Blue Cross of Pennsylvania (PA) |
| WJL | BCBS of Nebraska (NE) |
| WJM | Wellmark |
| WJN | Unassigned Prefix |
| WJO | Highmark BCBS of Pennsylvania (PA) |
| WJP | Anthem BCBS of Wisconsin (WI) |
| WJQ | Unassigned Prefix |
| WJR | Anthem BCBS of Virginia (VA) |
| WJS | Anthem BCBS of Ohio (OH) |
| WJT | Anthem BCBS of Missouri (MO) |
| WJU | Wellmark |
| WJV | BCBS of Texas (TX) |
| WJW | BCBS of Illinois (IL) |
| WJX | BCBS of Illinois (IL) |
| WJY | BCBS of Illinois (IL) |
| WJZ | BCBS of Massachusetts (MA) |
| WKA | Anthem BCBS of Ohio (OH) |
| WKB | Unassigned Prefix |
| WKC | Capital Blue Cross of Pennsylvania (PA) |
| WKD | BCBS of Alabama (AL) |
| WKE | Unassigned Prefix |
| WKF | Anthem Blue Cross(BC) of California (CA) |
| WKG | Unassigned Prefix |
| WKH | Anthem Blue Cross(BC) of California (CA) |
| WKI | Regence BCBS |
| WKJ | Anthem BCBS of Ohio (OH) |
| WKK | BCBS of Illinois (IL) |
| WKL | Premera BCBS of Alaska (AK) |
| WKM | Unassigned Prefix |
| WKN | Unassigned Prefix |
| WKO | Unassigned Prefix |
| WKP | Capital Blue Cross of Pennsylvania (PA) |
| WKQ | BCBS of North Carolina (NC) |
| WKR | Anthem BCBS of Wisconsin (WI) |
| WKS | BCBS of Massachusetts (MA) |
| WKT | Anthem BCBS of Wisconsin (WI) |
| WKU | BCBS of North Carolina (NC) |
| WKV | Unassigned Prefix |
| WKW | BCBS of Massachusetts (MA) |
| WKX | Anthem BCBS of Wisconsin (WI) |
| WKY | BCBS of Illinois (IL) |
| WKZ | Anthem BCBS of Wisconsin (WI) |
| WLA | Unassigned Prefix |
| WLB | BCBS of South Carolina (SC) / Southcarolinablues |
| WLC | BCBS of Texas (TX) |
| WLD | Unassigned Prefix |
| WLE | BCBS Blue Care Network Michigan (MI) |
| WLF | BCBS of Illinois (IL) |
| WLG | BCBS of Alabama (AL) |
| WLH | Blue shield(BS) of California (CA) |
| WLI | Anthem BCBS of Ohio (OH) |
| WLJ | Premera BCBS of Alaska (AK) |
| WLK | Blue Cross (BC) of Idaho (ID) |
| WLL | Anthem BCBS of Kentucky (KY) |
| WLM | BCBS of Illinois (IL) |
| WLN | Highmark BCBS of Delaware (DE) |
| WLO | Unassigned Prefix |
| WLP | Anthem Blue Cross(BC) of California (CA) |
| WLQ | Wellmark |
| WLR | Empire BCBS of New York (NY) |
| WLS | BCBS of Alabama (AL) |
| WLT | Wellmark |
| WLU | Anthem BCBS of Indiana (IN) |
| WLV | Unassigned Prefix |
| WLW | Wellmark |
| WLX | Wellmark |
| WLY | Unassigned Prefix |
| WLZ | Highmark BCBS of Delaware (DE) |
| WMA | Wellmark |
| WMB | Anthem BCBS of Missouri (MO) |
| WMC | BCBS of Minnesota (MN) |
| WMD | BCBS of Minnesota (MN) |
| WME | BCBS of Illinois (IL) |
| WMF | Wellmark |
| WMG | Anthem Blue Cross(BC) of California (CA) |
| WMH | Highmark BCBS of Delaware (DE) |
| WMI | BCBS Blue Care Network Michigan (MI) |
| WMJ | Arkansas (AR) Blue Cross |
| WMK | Capital Blue Cross of Pennsylvania (PA) |
| WML | Anthem BCBS of Wisconsin (WI) |
| WMM | BCBS of Minnesota (MN) |
| WMN | BCBS of Illinois (IL) |
| WMO | Anthem Blue Cross(BC) of California (CA) |
| WMP | BCBS of Minnesota (MN) |
| WMQ | Unassigned Prefix |
| WMR | Anthem BCBS of Indiana (IN) |
| WMS | Anthem BCBS of Indiana (IN) |
| WMT | Anthem Blue Cross(BC) of California (CA) |
| WMU | BCBS of Texas (TX) |
| WMV | BCBS of Tennessee (TN) |
| WMW BCBS Prefix | Arkansas (AR) Blue Cross |
| WMX | Anthem BCBS of Indiana (IN) |
| WMY | Arkansas (AR) Blue Cross |
| WMZ | Anthem BCBS of Indiana (IN) |
| WNA | Anthem BCBS of Indiana (IN) |
| WNB | Empire BCBS of New York (NY) |
| WNC | BCBS of Alabama (AL) |
| WND | Excellus BCBS of New York (NY) |
| WNE | Premera BCBS of Alaska (AK) |
| WNF | Anthem Blue Cross(BC) of California (CA) |
| WNG | Anthem BCBS of Wisconsin (WI) |
| WNH | Empire BCBS of New York (NY) |
| WNI | Regence BCBS |
| WNJ | Unassigned Prefix |
| WNK | Arkansas (AR) Blue Cross |
| WNL | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| WNM | BCBS of Western New York (WNY) |
| WNN | Unassigned Prefix |
| WNO | Unassigned Prefix |
| WNP | Unassigned Prefix |
| WNQ | BCBS Blue Care Network Michigan (MI) |
| WNR | Anthem BCBS of Georgia (GA) |
| WNS | BCBS of Illinois (IL) |
| WNT | BCBS of Illinois (IL) |
| WNU | Unassigned Prefix |
| WNV | Unassigned Prefix |
| WNW | BCBS of Massachusetts (MA) |
| WNX | Arkansas (AR) Blue Cross |
| WNY | Unassigned Prefix |
| WNZ | BCBS of Massachusetts (MA) |
| WOA | Anthem Blue Cross(BC) of California (CA) |
| WOB | Premera BCBS of Alaska (AK) |
| WOC | Unassigned Prefix |
| WOD | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| WOE | Unassigned Prefix |
| WOF | BCBS Blue Care Network Michigan (MI) |
| WOG | Unassigned Prefix |
| WHO | Highmark BCBS of Pennsylvania (PA) |
| WOI | Unassigned Prefix |
| WOJ | Arkansas (AR) Blue Cross |
| WOK | BCBS of South Carolina (SC) / Southcarolinablues |
| WOL | Blue shield(BS) of Northeastern New York (NeNY) |
| WOM | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| WON | Unassigned Prefix |
| WOO | BCBS Blue Care Network Michigan (MI) |
| WOP | BCBS Blue Care Network Michigan (MI) |
| WOQ | BCBS Blue Care Network Michigan (MI) |
| WOR | Unassigned Prefix |
| WOS | Unassigned Prefix |
| WOT | BCBS Blue Care Network Michigan (MI) |
| WOU | Unassigned Prefix |
| WOV | Anthem BCBS of Georgia (GA) |
| WOW | Premera BCBS of Alaska (AK) |
| WOX | Unassigned Prefix |
| WOY | BCBS Blue Care Network Michigan (MI) |
| WOZ | Anthem BCBS of Colorado (CO) |
| WPA | Arkansas (AR) Blue Cross |
| WPB | Capital Blue Cross of Pennsylvania (PA) |
| WPC | BCBS of Kansas City |
| WPD | Anthem BCBS of Ohio (OH) |
| WPE | Unassigned Prefix |
| WPF | BCBS of Rhode Island (RI) |
| WPG | BCBS of Kansas City |
| WPH | BCBS of Alabama (AL) |
| WPI | BCBS Blue Care Network Michigan (MI) |
| WPJ | Unassigned Prefix |
| WPK | Anthem Blue Cross(BC) of California (CA) |
| WPL | Anthem BCBS of Ohio (OH) |
| WPM | BCBS of Kansas City |
| WPN | Unassigned Prefix |
| WPO | BCBS Blue Care Network Michigan (MI) |
| WPP | Anthem BCBS of Kentucky (KY) |
| WPQ | Anthem BCBS of Colorado (CO) |
| WPR | Empire BCBS of New York (NY) |
| WPS | Arkansas (AR) Blue Cross |
| WPT | Wellmark |
| WPU | Anthem Blue Cross(BC) of California (CA) |
| WPV | Anthem Blue Cross(BC) of California (CA) |
| WPW | Anthem BCBS of Indiana (IN) |
| WPX | Anthem Blue Cross(BC) of California (CA) |
| WPY | Anthem Blue Cross(BC) of California (CA) |
| WPZ | Wellmark |
| WQA | Unassigned Prefix |
| WQB | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| WQC | Unassigned Prefix |
| WQD | BCBS of Western New York (WNY) |
| WQE | Highmark BCBS of Pennsylvania (PA) |
| WQF | Unassigned Prefix |
| WQG | Highmark BCBS of Pennsylvania (PA) |
| WQH | Highmark BCBS of Pennsylvania (PA) |
| WQI | Highmark BCBS of Pennsylvania (PA) |
| WQJ | BCBS of Western New York (WNY) |
| WQK | Unassigned Prefix |
| WQL | Unassigned Prefix |
| WQM | Unassigned Prefix |
| WQN | BCBS of Illinois (IL) |
| WQO | BCBS of Western New York (WNY) |
| WQP | Anthem BCBS of Ohio (OH) |
| WQQ | BCBS of Western New York (WNY) |
| WQR | Highmark BCBS of Pennsylvania (PA) |
| WQS | Unassigned Prefix |
| WQT | Unassigned Prefix |
| WQU | Anthem BCBS of Ohio (OH) |
| WQV | Unassigned Prefix |
| WQW | Wellmark |
| WQX | Unassigned Prefix |
| WQY | Anthem BCBS of Ohio (OH) |
| WQZ | Wellmark |
| WRA | Wellmark |
| WRB | Unassigned Prefix |
| WRC | Horizon BCBS of New Jersey (NJ) |
| WRD | Unassigned Prefix |
| WRE | Anthem BCBS of Kentucky (KY) |
| WRF | BCBS of Massachusetts (MA) |
| WRG | Anthem BCBS of Ohio (OH) |
| WRH | Unassigned Prefix |
| WRI | BCBS of Alabama (AL) |
| WRJ | Unassigned Prefix |
| WRK | BCBS of Rhode Island (RI) |
| WRL | Regence BCBS |
| WRM | Highmark BCBS of Pennsylvania (PA) |
| WRN | Regence BCBS |
| WRO | Anthem BCBS of Georgia (GA) |
| WRP | Unassigned Prefix |
| WRQ | Anthem BCBS of Georgia (GA) |
| WRR | Anthem BCBS of Missouri (MO) |
| WRS | Anthem Blue Cross(BC) of California (CA) |
| WRT | Unassigned Prefix |
| WRU | Wellmark |
| WRV | BCBS of Alabama (AL) |
| WRW | BCBS of Rhode Island (RI) |
| WRX | Anthem Blue Cross(BC) of California (CA) |
| WRY BCBS Prefix | Anthem BCBS of Georgia (GA) |
| WRZ | Anthem BCBS of Georgia (GA) |
| WSA | Blue Advantage of Arkansas (AR) |
| WSB | BCBS of Minnesota (MN) |
| WSC | BCBS of Illinois (IL) |
| WSD | Anthem BCBS of Wisconsin (WI) |
| WSE | Unassigned Prefix |
| WSF | Arkansas (AR) Blue Cross |
| WSG | Anthem BCBS of Ohio (OH) |
| WSH | Unassigned Prefix |
| WSI | BCBS of North Carolina (NC) |
| WSJ | Anthem Blue Cross(BC) of California (CA) |
| WSK | Anthem BCBS of Nevada (NV) |
| WSL | Wellmark |
| WSM | Anthem BCBS of Wisconsin (WI) |
| WSN | BCBS of South Carolina (SC) / Southcarolinablues |
| WSO | Anthem BCBS of Ohio (OH) |
| WSP | Anthem BCBS of Indiana (IN) |
| WSQ | Unassigned Prefix |
| WSR | Unassigned Prefix |
| WSS | BCBS of Western New York (WNY) |
| WST | BCBS of Massachusetts (MA) |
| WSU | Wellmark |
| WSV | Wellmark |
| WSW | BCBS of Illinois (IL) |
| WSX | BCBS of Minnesota (MN) |
| WSY | Anthem BCBS of Ohio (OH) |
| WSZ | BCBS of Illinois (IL) |
| WTA | Anthem BCBS of Wisconsin (WI) |
| WTB | Wellmark |
| WTC | Premera BCBS of Alaska (AK) |
| WTD | BCBS of Western New York (WNY) |
| WTE | BCBS of Illinois (IL) |
| WTF | Unassigned Prefix |
| WTG | Regence BCBS |
| WTH | BCBS of Illinois (IL) |
| WTI | Unassigned Prefix |
| WTJ | Unassigned Prefix |
| WTK | Unassigned Prefix |
| WTL | Unassigned Prefix |
| WTM | BCBS of Illinois (IL) |
| WTN | Wellmark |
| WTO | Arkansas (AR) Blue Cross |
| WTP | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| WTQ | BCBS of Alabama (AL) |
| WTR | BCBS of Illinois (IL) |
| WTS | Anthem BCBS of Wisconsin (WI) |
| WTT | Premera BCBS of Alaska (AK) |
| WTU | Premera BCBS of Alaska (AK) |
| WTV | Premera BCBS of Alaska (AK) |
| WTW | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| WTX | Unassigned Prefix |
| WTY | Unassigned Prefix |
| WTZ | BCBS of Illinois (IL) |
| WUA | BCBS Blue Care Network Michigan (MI) |
| WUB | BCBS of Texas (TX) |
| WUC | Empire BCBS of New York (NY) |
| WUD | Unassigned Prefix |
| WUE | Blue shield(BS) of California (CA) |
| WUF | Wellmark |
| WUG | Horizon BCBS of New Jersey (NJ) |
| WUH | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| WUI | Anthem BCBS of Ohio (OH) |
| WUJ | BCBS of Rhode Island (RI) |
| WUK | Anthem BCBS of Indiana (IN) |
| WUL | Anthem BCBS of Indiana (IN) |
| WUM | Highmark BCBS of Pennsylvania (PA) |
| WUN | BCBS of North Carolina (NC) |
| WUO | Blue shield(BS) of California (CA) |
| WUP | Unassigned Prefix |
| WUQ | Wellmark |
| WUR | Horizon BCBS of New Jersey (NJ) |
| WUS | Anthem BCBS of Colorado (CO) |
| WUT | Anthem BCBS of Indiana (IN) |
| WUU | BCBS of South Carolina (SC) / Southcarolinablues |
| WUV | BCBS of Massachusetts (MA) |
| WUW | Anthem Blue Cross(BC) of California (CA) |
| WUX | Anthem BCBS of Indiana (IN) |
| WUY | Unassigned Prefix |
| WUZ | Unassigned Prefix |
| WVA | Blue Cross (BC) of Idaho (ID) |
| WVB | Unassigned Prefix |
| WVC | Anthem BCBS of Wisconsin (WI) |
| WVD | Florida (FL) Blue |
| WVE | BCBS of Illinois (IL) |
| WVF | Unassigned Prefix |
| WVG | Unassigned Prefix |
| WVH | Highmark BCBS of West Virginia (WV) |
| WVI | Blue shield(BS) of California (CA) |
| WVJ | Unassigned Prefix |
| WVK | BCBS of North Carolina (NC) |
| WVL | BCBS of Alabama (AL) |
| WVM | Wellmark |
| WVN | Unassigned Prefix |
| WVO | Arkansas (AR) Blue Cross |
| WVP | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| WVQ | Unassigned Prefix |
| WVR | Anthem BCBS of Georgia (GA) |
| WVS | Blue shield(BS) of California (CA) |
| WVT | Highmark BCBS of Pennsylvania (PA) |
| WVU | Anthem BCBS of Kentucky (KY) |
| WVV | Unassigned Prefix |
| WVW | Unassigned Prefix |
| WVX | Blue Cross (BC) of Idaho (ID) |
| WVY | Anthem BCBS of Colorado (CO) |
| WVZ | Wellmark |
| WWA | Empire BCBS of New York (NY) |
| WWB | BCBS of Massachusetts (MA) |
| WWC | BCBS of Massachusetts (MA) |
| WWD | Regence BCBS |
| WWE | Wellmark |
| WWF | BCBS of Texas (TX) |
| WWG | Unassigned Prefix |
| WWH | Unassigned Prefix |
| WWI | Premera BCBS of Alaska (AK) |
| WWJ | Unassigned Prefix |
| WWK | Unassigned Prefix |
| WWL | Unassigned Prefix |
| WWM | Blue Advantage of Arkansas (AR) |
| WWN | BCBS of Nebraska (NE) |
| WWO | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| WWP | Anthem Blue Cross(BC) of California (CA) |
| WWQ | Anthem BCBS of Wisconsin (WI) |
| WWR | Wellmark |
| WWS | Anthem Blue Cross(BC) of California (CA) |
| WWT | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| WWU | BCBS of Massachusetts (MA) |
| WWV | BCBS of Texas (TX) |
| WWW | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| WWX | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| WWY | BCBS of Massachusetts (MA) |
| WWZ | BCBS Blue Care Network Michigan (MI) |
| WXA | Anthem BCBS of Wisconsin (WI) |
| WXB | Wellmark |
| WXC | BCBS of Texas (TX) |
| WXD | BCBS of Texas (TX) |
| WXE | BCBS of Nebraska (NE) |
| WXF | BCBS of Texas (TX) |
| WXG | BCBS of Texas (TX) |
| WXH | BCBS of South Carolina (SC) / Southcarolinablues |
| WXI | Unassigned Prefix |
| WXJ | Regence BCBS |
| WXK | Wellmark |
| WXL | BCBS of Minnesota (MN) |
| WXM | Highmark BCBS of Pennsylvania (PA) |
| WXN | BCBS of Illinois (IL) |
| WXO | Anthem BCBS of Colorado (CO) |
| WXP | Anthem BCBS of Missouri (MO) |
| WXQ | Wellmark |
| WXR | BCBS of Texas (TX) |
| WXS | BCBS of Tennessee (TN) |
| WXT | Unassigned Prefix |
| WXU | BCBS of Texas (TX) |
| WXV | Unassigned Prefix |
| WXW | Unassigned Prefix |
| WXX | BCBS of Texas (TX) |
| WXY | Anthem Blue Cross(BC) of California (CA) |
| WXZ | Florida (FL) Blue |
| WAY | Unassigned Prefix |
| WYB | BCBS of Illinois (IL) |
| WYC | Anthem Blue Cross(BC) of California (CA) |
| WYD | Unassigned Prefix |
| WYE | Horizon BCBS of New Jersey (NJ) |
| WYF | Wellmark |
| WYG | Anthem BCBS of Ohio (OH) |
| WYH | BCBS of Illinois (IL) |
| WYI | BCBS Blue Care Network Michigan (MI) |
| WYJ | Unassigned Prefix |
| WYK | Anthem BCBS of Virginia (VA) |
| WYL | Unassigned Prefix |
| WYM | BCBS of Illinois (IL) |
| WYN | Unassigned Prefix |
| WYO | BCBS Blue Care Network Michigan (MI) |
| WYP | Unassigned Prefix |
| WYQ | Unassigned Prefix |
| WYR | Arkansas (AR) Blue Cross |
| WYS | BCBS of Alabama (AL) |
| WYT | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| WYU | BCBS of Illinois (IL) |
| WYV | Unassigned Prefix |
| WYW | Blue Cross (BC) of Idaho (ID) |
| WYX | Independence Blue Cross(BC) of Philadelphia(Phi) and Southeastern Pennsylvania(PA) |
| WYY | BCBS of Oklahoma (OK) |
| WYZ | Florida (FL) Blue |
| WZA | Unassigned Prefix |
| WZB | Anthem BCBS of Wisconsin (WI) |
| WZC | Wellmark |
| WZD | Anthem BCBS of Wisconsin (WI) |
| WZE | Unassigned Prefix |
| WZF | Carefirst BCBS of Maryland (MD)/ District of Columbia (DC) and Northern Virginia (VA) |
| WZG | BCBS of Texas (TX) |
| WZH | Premera BCBS of Alaska (AK) |
| WZI | Blue shield(BS) of California (CA) |
| WZJ | Unassigned Prefix |
| WZK | Unassigned Prefix |
| WZL | Anthem BCBS of Wisconsin (WI) |
| WZM | Anthem BCBS of Ohio (OH) |
| WZN | Wellmark |
| WZO | Regence BCBS |
| WZP | Anthem BCBS of Wisconsin (WI) |
| WZQ | Regence BCBS |
| WZR | Anthem BCBS of Colorado (CO) |
| WZS | Anthem BCBS of Colorado (CO) |
| WZT | Anthem BCBS of Colorado (CO) |
| WZU | Anthem BCBS of Wisconsin (WI) |
| WZV | Anthem BCBS of Wisconsin (WI) |
| WZW | Florida (FL) Blue |
| WZX | Wellmark |
| WZY | Anthem BCBS of Ohio (OH) |
| WZZ BCBS Prefix | BCBS of Minnesota (MN) |
