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M20 - Denial Journal
RARC

M20

Missing/incomplete/invalid HCPCS

What This Code Means

The HCPCS code on the claim is missing, incomplete, or invalid.

Common Causes

  • HCPCS code retired or updated in an annual code set change
  • Typo in the HCPCS field

How to Resolve or Appeal

  1. Verify the correct, current HCPCS code for the date of service
  2. Correct and resubmit as a corrected claim

Related Codes

CO-16

More Denial Codes to Check

RARC M50 RARC MA71 RARC MA58 CARC CO-D3 CARC CO-4 Procedure code inconsistent with the modifier used CARC CO-D21 CARC CO-231 Mutually exclusive procedures cannot be done in the same day/setting RARC N65 Procedure code or procedure rate count cannot be determined, or was not on file, for the date of service/provider RARC MA104 RARC MA66 RARC M33 RARC M22

Educational reference only — not medical or legal advice. Always confirm code usage and appeal rights with the specific payer.

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