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