CARC 11: The diagnosis is inconsistent with the procedure.
The diagnosis code on the claim doesn't justify the procedure code as a medically supported combination per insurer policy.
CARC 11 is the code your insurance company used to explain why your claim was reduced, denied, or paid less than expected. It appears on your Explanation of Benefits (EOB) — the statement your plan sends after a claim is processed. Here's what it means for you and what you can do about it.
What CARC 11 means
The official X12 description is: “The diagnosis is inconsistent with the procedure.”
In plain language: The diagnosis code on the claim doesn't justify the procedure code as a medically supported combination per insurer policy.
Common scenarios
- Mismatched ICD-10 + CPT pairing
- Surgery without supporting indication
- Imaging without supporting symptom code
What to do next 11
Appeal with clinical documentation showing the diagnosis warrants the procedure. Often a coding fix at the provider level resolves this — request the provider review and resubmit before formally appealing.
DenialHelp helps organize a source-linked draft from the denial notice and confirmed case facts. The patient and treating clinician must verify the governing review rule, current payer policy, clinical sources, attachments, destination, and deadline.
CARC 11 group codes explained
On the 835 ERA, CARC 11 appears alongside a group code that signals who is financially responsible for the adjustment. CO (Contractual Obligation) — Contractual write-off. The provider agreed to the rate. Patient does NOT owe this amount.
Frequently asked questions
What does CARC 11 mean?
The diagnosis is inconsistent with the procedure. In plain language: The diagnosis code on the claim doesn't justify the procedure code as a medically supported combination per insurer policy.
Is CARC 11 appealable?
Yes — CARC 11 is one of the codes that commonly supports an appeal. Appeal with clinical documentation showing the diagnosis warrants the procedure. Often a coding fix at the provider level resolves this — request the provider review and resubmit before formally appealing.
Which group code does CARC 11 appear under?
CARC 11 most often appears under: CO (Contractual Obligation) — Contractual write-off. The provider agreed to the rate. Patient does NOT owe this amount.
When does CARC 11 typically appear on a denial?
Common scenarios: Mismatched ICD-10 + CPT pairing; Surgery without supporting indication; Imaging without supporting symptom code.
How do I appeal a CARC 11 denial?
Appeal with clinical documentation showing the diagnosis warrants the procedure. Often a coding fix at the provider level resolves this — request the provider review and resubmit before formally appealing.
Related resources
Sources
Appeal a CARC 11 denial
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