CARC Code
251
Incomplete or Deficient Documentation Received
The payer received your documentation or attachment, but it was missing critical information or was not complete enough to process the claim. They need you to send additional or corrected documentation before they can pay.
missing infoHow to resolve this denial
Submit complete documentation and resubmit claim
- 1
Identify which specific documentation was deemed incomplete from the denial notice
- 2
Gather all required supporting documents: X-rays, photos, lab reports, clinical notes
- 3
Ensure all pages are legible and all required fields are completed
- 4
Resubmit the claim with the complete documentation package
- 5
Use the payer's required submission format (electronic PWK, fax, or mail)
- 6
Log the resubmission date and track to ensure timely processing
▶✓ 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-251 — stats, related codes, appeal template
83%
Recovery Rate
7-14 days
Avg. Resolution
Easy
Difficulty
Occasional
Frequency
Payer-Specific Notes
How major payers handle CARC 251 by specialty.
Medicare
DME claims require complete CMN (Certificate of Medical Necessity); incomplete CMN = CARC 251
UnitedHealthcare
Surgical claims may require operative report; ensure all pages are submitted
Common 835 Combinations
CARC 251 most often appears with these Group Code + RARC combinations on 835 remittances.
Appeal Letter Template
Generic appeal template for CARC 251 denials.
We are resubmitting claim [CLAIM_NUMBER] with complete documentation as requested. Enclosed please find [DOCUMENT_LIST] for patient [PATIENT_NAME] (DOS: [DOS]). All documents are current, legible, and complete per your submission requirements.
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