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