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