| TAN TAO TAT TAX TAZ TBL TBN TBU TCD TCN TCU TCW TCY TCZ TDD TDF TDH TDR TDS TDU TDW TED TEE TEM TEN TEO TEU TEY TEZ TFA TFK TFN TFO TFQ TFS TFT TFV TFW TGG TGK TGP TGT TGU TGV TGY THI THK THL THO THP TIA TIH TII TIL TIQ TIT TJC TJE TJG TJI TJL TJM TJO TJT TKJ TKM TKQ TKR TKS TKU TKV TLB TLC TLG TLS TLZ TMF TNB TNC TND TNH TNJ TNM TNP TNT TOF TOI TOJ TOP TOR TOS TOW TOZ TPA TPJ TPK TPO TPP TPZ TQJ TQV TQX TSO TSR TSS TSY TSZ TTI TTO TTQ TTT TUD TUH TUJ TUM TUQ TUS TUW TVB TVD TVH TVP TVQ TVR TVX TWS TWZ TXB TXE TXF TXG TXI TXK TXO TXQ TXY TYD TYE TYH TYI TYJ TYS TYV TYX TZC TZG TZH TZK TZP TZR TZZ | Alpha Prefix not assigned or unallocated |
| TAE TGZ TQN TZX | Anthem Blue-Cross-Blue-Shield of Colorado |
| TAD TFJ TLP TRN TSJ TVW | Anthem Blue-Cross-Blue-Shield of Connecticut |
| TCL TDZ TIS TOT TSE TSN TSW TTW TVN TWA TZO | Anthem Blue-Cross-Blue-Shield of Georgia |
| TQE TTL TZV | Anthem Blue-Cross-Blue-Shield of Indiana |
| TCS THA TMR TOA TPE TPL TPX TTY TUG | Anthem Blue-Cross-Blue-Shield of Kentucky |
| TXH | Anthem Blue-Cross-Blue-Shield of Maine |
| TBF TBH TBO TGR TMT TVG TYR | Anthem Blue-Cross-Blue-Shield of Missouri |
| TDG TXJ | Anthem Blue-Cross-Blue-Shield of Nevada |
| TAW | Anthem Blue-Cross-Blue-Shield of New Hampshire |
| TAG TAR TCB TCE TCF TCH TCT TDN TEI TFF TGC TIO TJH TKC TKI TLQ TNF TNQ TOH TPN TQP TQS TSX TTC TTG TTM TTN TTZ TUC TUZ TWK TWU TWW TXM TYF TYK TZD TZN TZQ | Anthem Blue-Cross-Blue-Shield of Ohio |
| TAM TBI TBW TDO THY THZ TIP TIR TJA TPU TRH TSK TTS TVL TVM TVS | Anthem Blue-Cross-Blue-Shield of Virginia |
| TAS TBB TBQ TDP TGQ THJ TNK TRD TUP TXL | Anthem Blue-Cross-Blue-Shield of Wisconsin |
| TAB TAI TBT THU TJS TLL TMN TPF TPS TRJ TWR TYC TZM | Anthem Bluecross of California |
| TNN TOC TYG TYZ TZT | Arkansas Blue-Cross-Blue-Shield |
| TCA TEL TEQ TFR THG THV TJN TLJ TMG TMX TOD TRT TUN TWL TXC | Blue-Cross-Blue-Shield of Alabama |
| TGL TMZ TRE TTK TYW | Blue-Cross-Blue-Shield of Arizona |
| TAF TAJ TBE TBK TCC TDA TEA TEK TEP TEW TFD TFY TFZ TGH TIW TJZ TKE TKG TKH TKK TLE TLN TLO TLR TLT TLU TLX TMJ TML TMS TMV TPI TPV TRA TRB TRC TRK TRW TSI TUB TUK TUT TUX TWC TWV TXA TYT TZA TZE TZJ | Blue-Cross-Blue-Shield of Illinois |
| TOE | Blue-Cross-Blue-Shield of Kansas |
| TBS TRS TSF | Blue-Cross-Blue-Shield of Kansas City |
| TMC | Blue-Cross-Blue-Shield of Louisiana |
| TAU TBJ TBZ TCI TCJ TCK TIF TJJ TJW TJX TKP TLD TLI TMI TNR TQH TQZ TRL TTX TUF TVC TWE TXT TXX | Blue-Cross-Blue-Shield of Massachusetts |
| TBA TBP TBR TBX TCM TDJ TDQ TDV TEV TGN TIE TIU TIY TJD TJP TKA TKW TKY TKZ TLK TMH TNI TOU TOV TOY TPB TPM TQD TQF TQK TRF TTR TUY TVU TXN | Blue-Cross-Blue-Shield of Michigan |
| TAL TBV TDE TFL TFM TNL TOL TOQ TOX TQC TQM TQQ TQU TQY TRP TRY TSB TVJ TVT TWB | Blue-Cross-Blue-Shield of Minnesota |
| TKB TTU | Blue-Cross-Blue-Shield of Mississippi |
| TIG TJR TRV TSL | Blue-Cross-Blue-Shield of Nebraska |
| TAY TCO TDK TIJ TLF TNO TNX TOK TWG | Blue-Cross-Blue-Shield of North Carolina |
| TMO TQO | Blue-Cross-Blue-Shield of North Dakota |
| TKO TLV TPG | Blue-Cross-Blue-Shield of Rhode Island |
| TBD TET TIN TNA | Blue-Cross-Blue-Shield of South Carolina |
| TFH THX TNZ TUO TVA TVI TVO TXV TXZ TZI | Blue-Cross-Blue-Shield of Tennessee |
| TBC TCG TCP TCR TEC TEX TGB TGF THF TJB TJF TJK TJY TKL TKT TKX TMD TMK TMM TSA TTB TTF TWX TXD TXR TXS TXW TYL TYY | Blue-Cross-Blue-Shield of Texas |
| TAQ TEJ TGD TGI TID TLW TLY TWY TXU | Blue-Cross-Blue-Shield of Western New York |
| TDB TFI TME TRU TSH TTA | Bluecross of Idaho |
| TAC TCQ TCX TDI TDX TEF TEH TES TGX THW TIX TIZ TJQ TJV TLA TLM TMA TOO TRM TWH TYB | Blueshield of California |
| TYO | Blueshield of Northeastern New York |
| TRI TUA | Capital Bluecross of Pennsylvania |
| TEG TER TFG TFP TFU THB THC THE THH TIB TOB TPD TRO TTH TTP TVK TWT TYQ TYU | Carefirst Blue-Cross-Blue-Shield(Maryland/District of Columbia/Northern Virginia) |
| TDM | Credence Blue-Cross-Blue-Shield |
| TGA TGE TGS TNV TUR TWJ TWM TWQ | Empire Blue-Cross-Blue-Shield of New York |
| TNS TNY TPT | Excellus Blue-Cross-Blue-Shield of New York |
| TAV TBY TCV THM THQ THT TTJ TYM | Florida Blue |
| TGM | Florida Explore-My-Plan |
| TAA TBM TDC TDL TFX TQG TRZ TSM TUE TZB TZL TZU TZW TZY | Highmark Blue-Cross-Blue-Shield of Pennsylvania |
| TBG TEB TGW TJU TLH TMU TQL TQT TQW TUL TUU TUV TVV TWF TWP TYN TZF | Horizon Blue-Cross-Blue-Shield of New Jersey |
| TDY TFE THS TIC TIK TMB TMQ TMW TNU TON TPY TRQ TRX TWD TWO | Independence Bluecross of Philadelphia and Southeastern Pennsylvania |
| TAH TAP TDT TKD TST TXP TYA TZS | Premera Blue-Cross-Blue-Shield of Alaska |
| TMP TQA TRG TSU | Premera Bluecross of Alaska |
| TFB TFC TGO THR TIM TIV TKF TMY TNG TOG TPW TQB TQR TUI TVF TVZ TWI TWN | Regence Blue-Cross-Blue-Shield(Oregon/Idaho/Utah/Washington) |
| TAK TGJ THD THN TKN TNE TNW TOM TPC TPH TPQ TPR TQI TRR TSC TSD TSG TSP TSQ TSV TTD TTE TTV TVE TVY TYP | Wellmark Blue-Cross-Blue-Shield of South Dakota/Iowa |