ICD-10 Code Lookup
Is that diagnosis code actually billable? Search the full FY 2026 ICD-10-CM set by code or keyword and find out instantly — with the more specific codes when it is not.
Diagnosis specificity is one of the most common reasons a clean-looking claim comes back rejected. Many ICD-10-CM codes are headers — valid for describing a condition family, but not billable on a claim. This lookup tells you instantly whether a code is billable, and when it is not, it points you to the more specific codes that are.
Search ICD-10-CM codes
Billable vs. header codes
A billable code is complete — it carries every character the code set requires (laterality, encounter type, 7th characters where they apply) and can be reported on a claim. A header (non-billable) code is a category heading: it exists to organise the code set, and payers reject it with messages like "diagnosis code not valid for submission." When this tool marks a code non-billable, it lists the billable codes underneath it so you can pick the one that matches the documentation.
Using the result
- Match the documentation, not the other way round. Choose the most specific code the provider's notes actually support — never add characters just to make a code billable.
- "Unspecified" codes are billable but watched. They pay, but heavy use of unspecified codes draws payer scrutiny and can fail medical-necessity edits when a more specific code exists.
- Codes change every October 1. This lookup uses the FY 2026 code set (October 1, 2025 – September 30, 2026), published by CMS and the CDC in the public domain.
Frequently asked questions
What does it mean when an ICD-10 code is not billable?
It means the code is a category header rather than a complete code. The code set requires more characters — for example laterality or a 7th character — before the code can be reported on a claim. Submitting a header code is a guaranteed rejection, so pick the most specific billable code under it that the documentation supports.
Why was my claim rejected for diagnosis specificity?
Most payers edit diagnosis codes against the ICD-10-CM billable list. A truncated code, a header code, or a code deleted in the annual October update will reject even when everything else on the claim is correct. Checking billability before submission — as this tool and our Claim Scrubber Lite do — removes that whole class of rejections.
How current is this ICD-10 data?
It is the FY 2026 ICD-10-CM code set, effective October 1, 2025 through September 30, 2026, from the official CMS/CDC public-domain files. Codes are added, revised and deleted every year, so re-check long-standing codes each October.