This is a free reference tool for medical billing professionals. It maps every known Blue Cross Blue Shield alpha prefix to its home plan and gives you the billing essentials you need to submit claims correctly: provider phone numbers, electronic payer IDs, claims mailing addresses, timely filing limits, and prior authorization contacts.
Blue Cross Blue Shield isn’t one company. It’s 33 independent insurers sharing a brand and operating 65 separate billing entities, each with its own claims process, payer ID, and filing deadlines. For medical billers, that means a three-letter prefix on a patient’s insurance card is the key to routing claims correctly. Getting it wrong means denials, delays, and lost revenue.
The problem is that reliable prefix data is hard to find. The few lookup tools that exist online are poorly maintained, missing critical billing fields, or buried under intrusive advertising. Most billers end up cross-referencing multiple websites, digging through provider manuals, or relying on institutional knowledge passed between colleagues. This tool was built to fix that.
This tool is designed for anyone who works with BCBS claims on a regular basis. That includes medical billers and coders, revenue cycle management teams, practice managers and front desk staff verifying coverage, credentialing specialists, and clearinghouse support teams. Whether you’re in a single-provider practice or a large hospital billing department, the goal is the same: give you the information you need to route claims correctly, in seconds rather than minutes.
Start by typing a prefix code or plan name into the search bar on the homepage. Results appear instantly as you type. Click any result to see the full billing reference for that prefix, including the plan’s provider phone number, payer ID, claims address, and timely filing limit.
You can also browse by plan if you want to see all prefixes associated with a particular BCBS company. Every prefix page links to its parent plan, and every plan page lists all of its known prefixes. If you find one piece of information, you can quickly navigate to everything related to it.
Most prefix lookup tools only tell you the plan name and state. That’s not enough to actually submit a claim. This tool includes the operational billing data that matters: provider customer service phone numbers, electronic payer IDs for EDI claim submission, paper claims mailing addresses, timely filing limits, prior authorization phone numbers, and direct links to each plan’s provider website.
Every prefix is linked to its parent plan with full contact details in one place. No cross-referencing, no guesswork, and no paywalls. The database covers 65 BCBS billing entities across the United States and Puerto Rico, with over 20,000 prefix mappings.
All billing data is compiled from official BCBS plan websites, provider manuals, and clearinghouse records. It is reviewed regularly and updated when plans change their contact details, payer IDs, or filing requirements.
If you find incorrect or outdated information, you can report it directly from any prefix page. Corrections from working billers are the fastest way to keep this tool accurate, and every report is reviewed and applied promptly.
PrefixLookup is run by a small independent team who work in data and search rather than in claims. We built it after watching billing staff cross-reference three websites and a PDF to find a claims address, and it has grown faster than we expected: in the week of October 5, 2026 around 4,500 people used it, roughly double the number in July, and Microsoft Teams is one of our largest sources of visits because the link gets shared inside billing departments. The tool is the whole product. We don’t sell billing services and we don’t run ads. How we check the data, and what we still don’t cover, is on the methodology page.
This is a reference tool, not a claims processing system. Always verify billing details directly with the payer before submitting claims, particularly for complex situations involving BlueCard, Medicare Advantage, Medicaid, or Federal Employee Program coverage.
While we make every effort to keep the information on this site accurate and up to date, we cannot guarantee that all data is correct at the time you access it. Payer IDs, phone numbers, claims addresses, and filing deadlines can change without notice. We accept no responsibility or liability for claim denials, financial losses, or other consequences resulting from the use of information on this site. The data provided here is for reference purposes only, and the user is responsible for verifying all details before acting on them.
This site is not affiliated with, endorsed by, or sponsored by the BlueCross BlueShield Association or any Blue Cross Blue Shield company.