Free tool · Denial codes

Denial code lookup: what the code means and how to fix it

Type a code from your remittance (like CO-16 or 197) or a word (like "authorization"). You get the meaning in plain English, the usual cause and the next step.

What CO, PR, OA and PI mean

COContractual obligation. The provider absorbs it; do not bill the patient.

PRPatient responsibility. Bill the patient (deductible, coinsurance, copay, non-covered).

OAOther adjustment. Neither group applies, often coordination of benefits.

PIPayer-initiated reduction. The payer adjusted it; check the contract.

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Codes are Claim Adjustment Reason Codes (CARC) maintained by X12, summarized here in plain English. Official wording and the full list are at x12.org. Payer rules vary, so always check the remark code (RARC) and the payer's policy.