| H3G | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| H6M | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| H7R | CBA Blue | VT | | | Prefix Listing (Updated 02.07.25), Blue Cross and Blue Shield of Vermont |
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| H9T | CBA Blue | VT | | | Prefix Listing (Updated 02.07.25), Blue Cross and Blue Shield of Vermont |
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| HBL | Blue Cross NC (Healthy Blue Care Together) | NC | | | Children and Family Specialty Plan (CFSP) Managed Care Claims and Prior Authorizations Submission: Frequently Asked Questions - Part 2 (NC Medicaid, NC DHHS) |
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| HCJ | CBA Blue | VT | | | Prefix Listing (Updated 02.07.25), Blue Cross and Blue Shield of Vermont |
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| HDK | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| HJB | 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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| HLA | CBA Blue | VT | | | Prefix Listing (Updated 02.07.25), Blue Cross and Blue Shield of Vermont |
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| HME | Blue Cross and Blue Shield of North Carolina | NC | Medicare Advantage HMO-POS D-SNP | | Provider action items for Healthy Blue + Medicare (HMO-POS D-SNP) | Blue Cross NC |
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| HMS | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| HOP | Premera Blue Cross | AK | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| HRK | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| HRN | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| HRS | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| HTF | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| HTS | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| HUL | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| HVA | Blue Cross Blue Shield of Massachusetts | MA | | | Insurance ID Cards, Harvard University Student Health Program |
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| HWU | Anthem Blue Cross and Blue Shield (Kentucky) | KY | Exchange/Marketplace Small Group HMO | | Professional provider workshop, Fall 2019 - Administrative Services directory (Anthem Blue Cross and Blue Shield, Kentucky; AKYPEC-2253-19)Source dated before 2022 |
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| HWY | Premera Blue Cross/Shared Admin | AK | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| HWZ | Blue Cross and Blue Shield of Montana | MT | POS | | 2025 Three-Character Prefix Updated March 2025 (Blue Cross and Blue Shield of Montana) |
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| HXR | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| HZJ | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| HZR | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| HZU | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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