✦ Free Patient Advocacy Tool

What does that code on your bill actually mean?

Your Explanation of Benefits is full of codes nobody explains. Type one in below. We will tell you what it means, whether you really owe the money, and what to do next. Free. No account. Nothing saved.

50Most Common Codes
50States Covered
0Data Stored
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 EOB Code Decoder

Found a mysterious code on your EOB? Decode it instantly.

How to find your code

Grab the Explanation of Benefits your insurance sent you. People call it an EOB. Look for a column named Adjustment Reason, Remark Code, or Claim Status. The code might be a number like 45. It might mix letters and numbers, like N130. It might be letters only.

Type the code just like it looks on your EOB. Numbers, letters, or both. Leave the dash in or take it out. Prefixes like PR, CO, and OA are handled for you.

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Common codes to look for

Right now BenefitSleuth explains the 50 codes that show up most on patient bills. We add more all the time. For the full official list, see x12.org/codes.

Term of the day

Watch for:

Come back tomorrow for another healthcare term of the day.

Appeal letters and call scripts are coming next

BenefitSleuth is being built one tool at a time, out in the open, by someone who spent ten years working inside health insurance systems. Appeal letters and call scripts are on the way. Follow @ClaimCoachTee to know the day they go live.

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Important Disclaimer: BenefitSleuth provides general patient education only. Nothing on this platform constitutes legal or medical advice. Code explanations are general and may not reflect how your specific plan processed your specific claim. State laws change frequently. Always verify current law with your state Department of Insurance or a licensed attorney before taking action. BenefitSleuth is not a covered entity under HIPAA and is not a law firm. For patient use only. © 2026 Claimvera Health LLC.