How do I resolve a CO-11 denial?

Pull the original claim and review the specific field flagged by the RARC code Compare claim data against the patient's insurance card and eligibility response See full resolution steps at tryarceum.com.

Can I appeal a CO-11 denial?

Yes. Most CO-11 denials can be appealed within 60-180 days depending on payer. This is appealable if the diagnosis does support the procedure but was coded incorrectly, or if clinical documentation demonstrates medical necessity that was not initially evident. Use our free tool to generate an appeal letter.

CARC Code

11

🟡 Soft Denial

Diagnosis Inconsistent with Procedure

The diagnosis code(s) submitted do not support or match the procedure code(s) billed. The payer determined that the medical reason given does not justify the service performed.

coding

Resolution: 82%Medium difficulty7-14 days avg

How to resolve this denial

Which payer denied this claim?

Correct the diagnosis or procedure code and resubmit

1
Pull the original claim and review the specific field flagged by the RARC code
2
Compare claim data against the patient's insurance card and eligibility response
3
Correct the identified field(s) in the practice management system
4
Resubmit the corrected claim via the payer portal or clearinghouse
5
Confirm receipt and track the corrected claim to adjudication

Resolve this denial →

▶✓ Pre-action checklist — verify before contacting the payer

Review the full remittance advice (ERA/EOB) for additional RARC codes that explain the denial.
Verify the claim was submitted with correct patient eligibility and benefit information.
Check if this denial applies to a specific line item or the entire claim.

▶More about CO-11 — stats, related codes, appeal template

82%

Recovery Rate

7-14 days

Avg. Resolution

Medium

Difficulty

Common

Frequency

Payer-Specific Notes

How major payers handle CARC 11 by specialty.

Aetna

Aetna uses CO-11 when procedure/diagnosis combination fails edit. Check RARC for specific field.

Common 835 Combinations

CARC 11 most often appears with these Group Code + RARC combinations on 835 remittances.

COCO-11The payer has denied or adjusted this claim because the diagnosis codeAppealable COCO-11+N267This combination indicates the claim was denied due to a mismatch between the COCO-11+N5This combination indicates a coordination of benefits scenario where theAppealable

Look up any combination →

Appeal Letter Template

Generic appeal template for CARC 11 denials.

We are submitting a formal appeal for claim [CLAIM_NUMBER] for patient [PATIENT_NAME], date of service [DOS]. This claim was denied/adjusted with CARC 11 indicating: "The diagnosis is inconsistent with the procedure.." We have reviewed the claim and are providing the attached documentation to support reconsideration. [SUPPORTING_DOCUMENTATION]. Please reconsider payment per the terms of our contract.

Generate a personalized appeal letter →

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