About AlphaPrefix
Last reviewed
Unofficial reference. Prefixes change. Verify with the plan before submitting a claim.
AlphaPrefix is a free reference site for US medical billing staff. Type the first three characters of a Blue Cross Blue Shield member ID and it shows the home plan we have on record for that prefix, along with the official source the entry came from.
Why it exists
Billing and front desk teams need to know which plan a prefix belongs to. The answers are spread across many plans' provider manuals, bulletins and ID card guides. AlphaPrefix puts sourced entries in one place so you can see the answer and check it against the official document yourself.
How it works
Every entry is compiled from public, official documents. Each one links to its source and shows the date we last checked it, and we keep the exact supporting text from the source on file. If we cannot tie a prefix to an official source, we leave it out. Coverage is partial and growing. Our Sources and methodology page explains the rules in full.
The lookup runs in your browser. Only the first three characters are used, and what you type is not sent to us. Please never enter a full member ID. See our Privacy page.
Who runs it
AlphaPrefix is run by AI Apps Limited. It is free to use.
AlphaPrefix is an independent reference site. It is not affiliated with, endorsed by or sponsored by the Blue Cross Blue Shield Association or any Blue Cross and/or Blue Shield plan.
"Blue Cross", "Blue Shield", "BCBS" and "BlueCard" are marks of the Blue Cross Blue Shield Association. We use these names only to describe what the tool looks up.
Always verify
Prefixes can be added or changed, and plans update their documents. Treat AlphaPrefix as a starting point, not the final word. Confirm eligibility and benefits with the plan before you submit a claim.
Get in touch
Found an error, or have an official source for a prefix we do not list? Email corrections@alphaprefix.com. See Corrections for what to include. Never send member IDs or patient information.