BCBS Prefix List — All Alpha Prefixes A to Z
This is the complete list of Blue Cross Blue Shield alpha prefixes, organized alphabetically from A to Z. Each prefix is a 3-letter code assigned to a specific BCBS plan. Select a letter below to see all prefixes in that range, including the issuing BCBS company, state, provider phone number, and plan type.
Browse Prefixes by Letter
| Letter | Prefix Range | Link |
|---|---|---|
| A | AAA – AZZ | View A prefixes → |
| B | BAA – BZZ | View B prefixes → |
| C | CAA – CZZ | View C prefixes → |
| D | DAA – DZZ | View D prefixes → |
| E | EAA – EZZ | View E prefixes → |
| F | FAA – FZZ | View F prefixes → |
| G | GAA – GZZ | View G prefixes → |
| H | HAA – HZZ | View H prefixes → |
| I | IAA – IZZ | View I prefixes → |
| J | JAA – JZZ | View J prefixes → |
| K | KAA – KZZ | View K prefixes → |
| L | LAA – LZZ | View L prefixes → |
| M | MAA – MZZ | View M prefixes → |
| N | NAA – NZZ | View N prefixes → |
| O | OAA – OZZ | View O prefixes → |
| P | PAA – PZZ | View P prefixes → |
| Q | QAA – QZZ | View Q prefixes → |
| R | RAA – RZZ | View R prefixes → |
| S | SAA – SZZ | View S prefixes → |
| T | TAA – TZZ | View T prefixes → |
| U | UAA – UZZ | View U prefixes → |
| V | VAA – VZZ | View V prefixes → |
| W | WAA – WZZ | View W prefixes → |
| X | XAA – XZZ | View X prefixes → |
| Y | YAA – YZZ | View Y prefixes → |
| Z | ZAA – ZZZ | View Z prefixes → |
Prefix counts are based on our database of 21,000+ active BCBS prefixes. New prefixes are assigned regularly. If yours isn’t listed, call the number on the back of your card.
How the Prefix System Works
Every BCBS insurance card starts with a 3-letter alpha prefix. This prefix identifies which of the 34 independent BCBS companies issued the plan. Providers use the prefix to route claims to the correct company. Without it, a claim submitted to BCBS of Texas would fail if the patient actually has BCBS of Michigan.
Unlike other prefix lists that only show the prefix and plan name, each entry in our database includes the provider services phone number, plan type (PPO, HMO, or TRAD), and pre-certification contact. This data comes from official provider reference documents.
Most Searched Prefixes (Quick Reference)
These are the most frequently searched BCBS prefixes. Click any prefix for full details.
| Prefix | Company | State | Plan Type | Provider Phone |
|---|---|---|---|---|
| ZGP | Blue Cross and Blue Shield of Illinois | IL | PPO | (800) 203-0584 |
| XOF | Blue Cross and Blue Shield of Texas | TX | PPO | (800) 451-0287 |
| TEA | Blue Cross and Blue Shield of Texas | TX | PPO | (800) 451-0287 |
| YZF | Anthem Blue Cross Blue Shield of Indiana | IN | PPO | (800) 325-5368 |
| XEA | Blue Cross and Blue Shield of Texas | TX | PPO | (800) 451-0287 |
| EPI | Blue Cross Blue Shield of Arizona | AZ | PPO | (800) 232-2345 |
| UQK | Blue Cross and Blue Shield of Illinois | IL | PPO | (800) 203-0584 |
| TGT | Blue Cross and Blue Shield of Illinois | IL | PPO | (800) 203-0584 |
| XYL | Blue Cross and Blue Shield of Texas | TX | PPO | (800) 451-0287 |
| YRL | Anthem Blue Cross Blue Shield of Kentucky | KY | PPO | (800) 325-5368 |
How Do You Look Up a BCBS Prefix?
Use our lookup tool on the homepage to search any prefix. Type the 3 letters and get instant results. Or browse alphabetically using the table above: find the first letter of your prefix, click through to the full list, and search within that page. Each prefix entry shows the BCBS company, state, phone number, and plan type.
What Do the 3 Letters in a BCBS Prefix Mean?
The 3 characters are an alphanumeric code (letters and numbers) assigned by individual BCBS companies to identify specific plans. The first character often indicates the plan category or company. The second and third characters further narrow the product. Not every possible combination is used. Our database contains over 21,000 unique prefix-to-plan assignments because many prefixes are shared across multiple employer groups or account types within the same BCBS company.
For a full explanation, see our guide on how to read your BCBS card, which covers how the prefix connects to your member ID.
Are BCBS Prefixes the Same Across All States?
No. Each of the 34 BCBS companies assigns its own unique prefixes. Prefix ZGP belongs to BCBS of Illinois, not BCBS of Texas. Two different states will never share the same prefix for different companies. This is how the BlueCard system routes claims correctly when you visit a provider in another state. Learn more about how out-of-state coverage works.
How Often Are New BCBS Prefixes Added?
BCBS companies add new prefixes whenever they create new plan products or sign new employer group contracts. There’s no fixed schedule. Our database is updated regularly. If you have a brand-new card and your prefix isn’t listed, call the member services number on the back of your card.
BCBS companies also periodically retire or replace prefixes. This usually happens when a company migrates to a new data platform or restructures plan offerings. If the prefix on your physical card doesn’t match what your online portal shows, the portal is correct. The physical card is outdated.
Ready to find your BCBS company? Look up your prefix now.
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