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CO-195 Code: Refund Issued to Wrong Priority Payer

CO-195 means the payer issued a refund to another payer that paid this claim or service in the wrong priority, for example a payer that paid as primary when it should have been secondary. It's a coordination of benefits correction, not a new denial.

Quick facts

Code
CO-195 (CARC 195)
Status
Active In use since February 28, 2006; last modified September 30, 2007.
Code set
Claim Adjustment Reason Codes (CARC)
Group codes
  • CO (Contractual Obligation): The adjustment reflects a COB correction between payers. It doesn't create patient responsibility.
  • OA (Other Adjustment): Used as an informational adjustment for the payer-to-payer refund.
Official description
Refund issued to an erroneous priority payer for this claim/service.
X12 Claim Adjustment Reason Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What CO-195 means

CARC 195 reads “Refund issued to an erroneous priority payer for this claim/service.” When two payers cover the patient and the one that should have paid second paid first, payers sometimes fix it between themselves. The correct primary payer refunds the payer that paid in error, and reports it on your remittance with CARC 195.

It’s informational, but it affects your books. Money has moved between payers on your claim, and your posted payments should reflect the corrected COB order.

Example: a patient’s spouse’s plan should have been primary, but the patient’s own plan paid first. After the COB update, the spouse’s plan refunds the patient’s plan and reports CO-195 on its ERA to the provider. The provider then reviews both remittances to confirm the final balance.

When CO-195 needs attention

  • Duplicate payments from both payers left on the account, creating an overpayment.
  • Takebacks from the erroneous payer that reduce future payments.
  • Patient responsibility recalculated under the correct COB order.
  • Registration data still listing payers in the wrong order, causing future repeats.

How to handle it

  1. Review remittances from both payers for the claim.
  2. Post the CO-195 adjustment as a COB correction.
  3. Recalculate the balance. Identify any credit that needs to be refunded or any amount now due from the secondary payer.
  4. Update the patient’s insurance order in your system so the correct payer is primary.
  5. Submit secondary claims as needed with the primary payer’s adjudication data.

How to prevent it

  • Ask about all coverage at every registration and update COB data in box 9 to 9d and 11d. See eligibility and COB denials.
  • Apply standard COB rules (such as the birthday rule for dependents) when determining order.
  • Encourage patients to update COB with their payers when coverage changes.
  • Monitor COB-related adjustments across payers. ERA Analyzer can surface refund and takeback patterns.

Remark codes that may appear with CO-195

  • N373 (It has been determined that another payer paid the services as primary when they were not the primary payer.): Another payer paid as primary when it wasn't, so this payer is refunding that payer.
  • MA17 (We are the primary payer and have paid at the primary rate.): This payer is primary and paid at the primary rate. Contact the other insurer about refunding any excess.
  • OA-22 (This care may be covered by another payer per coordination of benefits.): The care may be covered by another payer per coordination of benefits.
  • OA-23 (The impact of prior payer(s) adjudication including payments and/or adjustments. (Use only with Group Code OA)): The impact of prior payer adjudication on this payer's payment.
  • CO-B13 (Previously paid.): Previously paid; payment for this claim may have been provided in a previous payment.

CO-195 FAQ

Do I owe money after CO-195?

Possibly, if you received payments from both payers that together exceed what was owed. Reconcile the claim across both payers to see whether a credit balance remains.

Why would one payer refund another?

When coordination of benefits is corrected, the payer that should have been primary may reimburse the one that paid first, instead of both reversing payments through the provider.

How should I post CO-195?

Post it as a COB adjustment and reconcile it with the other payer's remittance. Your practice management system should show the net effect on the claim balance.

Will the payer that paid in error take money back from me?

It may, especially if the payers don't settle the refund between themselves. Watch for recoupments or offsets on later remittances from the erroneous payer and match them to the original claim.

Does CO-195 change what the patient owes?

It can. Patient cost-sharing is recalculated under the correct payer order, so the final patient balance may go up or down. Rebill or refund the patient only after both payers' remittances are posted.