Denial code CO-50 (CARC)

CARC CO-50 often indicates that the payer does not cover the service as billed, sometimes due to medical necessity or benefit limits. A code on your EOB or denial letter explaining why a claim was not paid or was reduced. Standard codes are CARC (Claim Adjustment Reason Codes) and RARC (Remittance Advice Remark Codes). Payer-specific codes vary by insurer.