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CO-189 - Denial Journal
CARC CO — Contractual Obligation

CO-189

'Not otherwise classified' or 'unlisted' code billed when a specific code exists

What This Code Means

An unlisted/NOC procedure code was used even though a more specific code exists for the service performed.

Common Causes

  • Coder defaulted to an unlisted code out of habit or uncertainty
  • Newer specific code not yet added to the practice's charge master

How to Resolve or Appeal

  1. Identify and use the correct, more specific CPT/HCPCS code
  2. Update the charge master to prevent recurrence

More Denial Codes to Check

RARC N94 Claim/service denied because a more specific taxonomy code is required for adjudication CARC CO-D20 RARC M99 RARC M53 CARC CO-B22 RARC N29 CARC CO-14 The date of birth follows the date of service CARC CO-B17 RARC N24

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

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