| L2S | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| L4D | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| L4N | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| L5N | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| L5T | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| L7S | Blue Cross & Blue Shield of Rhode Island | RI | | | New membership effective January 1, 2020, Blue Cross & Blue Shield of Rhode Island provider updateSource dated before 2022 |
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| L8H | CBA Blue | VT | | | Prefix Listing (Updated 02.07.25), Blue Cross and Blue Shield of Vermont |
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| L9C | CBA Blue | VT | | | Prefix Listing (Updated 02.07.25), Blue Cross and Blue Shield of Vermont |
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| LBG | Anthem Blue Cross and Blue Shield (Connecticut) | CT | | | Anthem Blue Cross and Blue Shield (Anthem Health Plans of Maine, Inc.) provider telephone and fax directory (ME_CONTACT_00002) |
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| LBO | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| LBR | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| LEE | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| LFH | Blue Cross and Blue Shield of Montana | MT | | | 2025 Three-Character Prefix Updated March 2025 (Blue Cross and Blue Shield of Montana) |
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| LGI | Anthem Blue Cross and Blue Shield (Connecticut) | CT | | | Anthem Blue Cross and Blue Shield (Anthem Health Plans of Maine, Inc.) provider telephone and fax directory (ME_CONTACT_00002) |
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| LIT | Premera Blue Cross/Shared Admin | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| LKG | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| LMM | CBA Blue | VT | | | Prefix Listing (Updated 02.07.25), Blue Cross and Blue Shield of Vermont |
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| LOS | Anthem Blue Cross and Blue Shield (Connecticut) | CT | | | Anthem Blue Cross and Blue Shield (Anthem Health Plans of Maine, Inc.) provider telephone and fax directory (ME_CONTACT_00002) |
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| LPS | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| LQL | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| LRR | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| LUR | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| LVN | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| LXS | Blue Cross and Blue Shield of Louisiana | LA | | | Identification Card Guide (Blue Cross and Blue Shield of Louisiana, 18NW1743 R12/25) |
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| LZB | Blue Cross and Blue Shield of Louisiana | LA | | | Identification Card Guide (Blue Cross and Blue Shield of Louisiana, 18NW1743 R12/25) |
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| LZY | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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