| K2Q | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| K2S | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| K3S | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| K5T | 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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| K6T | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| K8L | Premera Blue Cross HMO | WA | HMO | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| KAS | Blue Cross and Blue Shield of Kansas | KS | | | Professional Provider Report - May 27, 2022, Blue Cross and Blue Shield of Kansas (item: St. Francis Ministries Benefit Information) |
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| KBK | CBA Blue | VT | | | Prefix Listing (Updated 02.07.25), Blue Cross and Blue Shield of Vermont |
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| KBR | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| KCQ | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| KDU | CBA Blue | VT | | | Prefix Listing (Updated 02.07.25), Blue Cross and Blue Shield of Vermont |
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| KFY | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| KHS | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| KKZ | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| KLZ | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| KQK | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| KQU | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| KSA | Blue Cross and Blue Shield of Kansas | KS | EPO | | BlueCare EPO (Exclusive Provider Organization) - Professional provider information, Blue Cross and Blue Shield of Kansas |
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| KSE | Blue Cross and Blue Shield of Kansas | KS | | | 2024 Insurance Biller's Seminar (professional provider) - Blue Cross and Blue Shield of Kansas |
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| KTN | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| KTQ | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| KTY | CBA Blue | VT | | | Prefix Listing (Updated 02.07.25), Blue Cross and Blue Shield of Vermont |
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| KXF | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| KXM | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| KXR | Premera Blue Cross | WA | | | Premera Blue Cross Three Character Prefixes (Premera Blue Cross, form 020469) |
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| KYH | Anthem Blue Cross and Blue Shield (Kentucky) | KY | | | 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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