| D2J | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| D3M | CBA Blue | VT | | | Prefix Listing (Updated 02.07.25), Blue Cross and Blue Shield of Vermont |
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| D4U | Anthem Blue Cross and Blue Shield (Maine) | ME | | | New ID cards for some Anthem members, Anthem Blue Cross and Blue Shield Provider News (Maine)Source dated before 2022 |
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| D4W | Anthem Blue Cross and Blue Shield (Maine) | ME | | | New ID cards for some Anthem members, Anthem Blue Cross and Blue Shield Provider News (Maine)Source dated before 2022 |
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| D4X | Anthem Blue Cross and Blue Shield (Maine) | ME | | | New ID cards for some Anthem members, Anthem Blue Cross and Blue Shield Provider News (Maine)Source dated before 2022 |
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| D8L | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| DBH | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| DEN | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| DEW | CBA Blue | VT | | | Prefix Listing (Updated 02.07.25), Blue Cross and Blue Shield of Vermont |
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| DFC | Premera Blue Cross | AK | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| DNP | CareFirst BlueCross BlueShield | Multi-state | Medicare Advantage HMO-SNP | | Provider Quick Reference Guide (CareFirst BlueCross BlueShield, CUT6010-1E) |
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| DXE | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| DXK | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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