Healthcare Error Code
Healthcare Insurance / Medical Billing
Claim Adjustment Reason Codes (CARC)
CO-11 | Diagnosis inconsistent with procedure
Industry
Healthcare
Canonical
/healthcare/error-codes/co-11/
Last Updated
Feb 25, 2026
Summary
This code indicates that the diagnosis reported does not support the billed procedure according to payer rules.
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What This Code Means
CO-11 is used when the diagnosis code submitted does not align with the procedure under payer policy. Payers apply clinical policy logic to determine whether reported diagnoses justify billed services. This is a policy-based determination rather than a billing format issue. It does not automatically indicate incorrect care. Coverage decisions depend on diagnosis–procedure relationships defined by the payer.
Where Users Usually See This Code
- Remittance advice
- EOB explanations
- Claim adjudication details
Why This Code Appears
- Diagnosis does not meet payer policy criteria
- Incorrect or incomplete diagnosis selection
- Payer-specific clinical edits applied
What Typically Happens Next
- Payment is denied or adjusted
- The claim line is finalized
- Appeal options may exist
What This Code Is Not
- It is not a duplicate claim
- It is not a missing information error
- It is not a contractual adjustment
Troubleshooting Checklist
- □ Review payer medical policies
- □ Confirm diagnosis–procedure alignment
- □ Monitor policy updates
Notes And Edge Cases
Clinical policy edits vary by payer. Updates to medical policy can change how diagnosis–procedure relationships are evaluated.
Related Codes
8 links
- CO-39 CodeServices denied as experimental
- M62 CodeService not medically necessary
- CO-65 CodeProcedure code invalid
- CO-200 CodeNon-covered service
- CO-61 CodeProcedure not covered for age
- CO-4 CodeService inconsistent with modifier
- CO-50 CodeNon-covered services
- CO-54 CodeMultiple physicians not allowed
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