OA-195 shows up when a payer learns it should have been primary, and another payer paid first by mistake. Instead of making you refund the other payer, this payer sends the money back to it for you. The 835 reports that amount with CARC 195 so your books can show where the money went. It’s a coordination of benefits (COB) clean-up code, not a denial of the service. (Primary source: X12 Claim Adjustment Reason Codes)
In brief: CARC 195 reads “Refund issued to an erroneous priority payer for this claim/service.” Post the CARC 195 amount as a refund already made to the other payer. Then match it to that payer’s overpayment notice so you don’t refund the same money twice.
Part of our denial codes library. Written by Manikandan J, CPC, CRCR, who has cleaned up coordination of benefits credits for multi-payer practices. Published 22 October 2026. Last updated: 22 October 2026. Code wording quoted word for word from X12.
Official CARC 195 description
| Field | X12 text |
|---|---|
| Code | 195 |
| Description | “Refund issued to an erroneous priority payer for this claim/service.” |
| Start | 02/28/2006 |
| Last modified | 09/30/2007 |
Source: X12 Claim Adjustment Reason Codes, checked 22 October 2026.
Key COB terms
Priority means payment order: the primary payer pays first and the secondary pays after it. An erroneous priority payer is a plan that paid as primary when it wasn’t. Coordination of benefits is the set of rules plans use to decide that order. Our guide on claims denied for coordination of benefits covers the order rules.
The remark code usually confirms what happened. N373 reads “It has been determined that another payer paid the services as primary when they were not the primary payer. Therefore, we are refunding to the payer that paid as primary on your behalf.”
Example scenario (fictional names), part 1
OA-195 Denial Example: What Happened
Who: Leah Morrison, the posting lead at Fairview Pediatrics, and Dr. Carlos Medina, the pediatrician.
What happened: a child’s visit (99214) for acute bronchitis (J20.9) was paid first by Copperfield Health, a fictional commercial plan on the mother’s employer coverage. Weeks later, Copperfield learned the father’s plan, Hartwell Health, another fictional commercial plan, was primary under the birthday rule.
The 835: Hartwell paid as primary and showed CAS*OA*195 for an amount with remark LQ*HE*N373. The next day, Copperfield’s overpayment letter arrived asking Fairview to refund its full payment.
Should Leah send Copperfield a check, or had Hartwell already done it? Keep reading, or jump to how the OA-195 denial was resolved.
Why payers use reason code 195
- Primary payer changed. For example, a plan learns of other coverage after paying, such as a spouse’s plan under the birthday rule.
- Medicare secondary payer cases. An employer plan or liability plan should have paid before Medicare.
- Payer-to-payer recovery. Some plans settle overpayments directly with the other payer rather than through the provider.
How to post and work an OA-195 line
- Read the remark. N373 confirms that this payer refunded the erroneous primary payer for you.
- Post the amount as a refund made on your behalf. Use a refund or transfer adjustment, not a write-off or patient balance.
- Find the other payer’s notice. Match its overpayment letter or recoupment to the CARC 195 amount.
- Tell the other payer. If it still asks you to refund, send it the 835 page showing the refund was made.
- Update the COB order in your system so future claims go to the right primary payer.
Example scenario (fictional names), part 2
How the OA-195 Denial Was Resolved
Leah compared the two documents. Hartwell’s CARC 195 amount matched Copperfield’s payment to the cent, so Hartwell had already returned it.
Fix: no claim change was needed. Leah posted the CARC 195 amount as a refund issued by Hartwell. She replied to Copperfield’s letter with the Hartwell 835 page and asked it to close the request. She also updated the patient’s plan order to make Hartwell primary.
Outcome: Copperfield confirmed it had received the funds and closed the request. Fairview avoided paying the same refund twice.
Names and details are illustrative; no real patient data.
Why there’s no claim form fix for CARC 195
The claim to Hartwell was correct, and so were the codes and diagnosis. CARC 195 reports money moving between payers. The work is in posting, COB records and the other payer’s refund request, so no CMS-1500 box or UB-04 form locator changes.
CARC 195 vs related COB codes
| Code | What it means | Key difference |
|---|---|---|
| OA-195 | Refund issued to an erroneous priority payer | Payer refunded the other payer for you |
| CO-22 | Care may be covered by another payer per COB | Bill the other payer first |
| OA-23 | Impact of prior payer adjudication | Normal secondary processing |
| OA-18 | Exact duplicate claim/service | Billed twice |
Recap
OA-195 means this payer refunded another payer that wrongly paid as primary. Post the amount as a refund made on your behalf. Match it to the other payer’s overpayment request so you don’t pay twice, and fix the COB order on the account.
FAQ
What does OA-195 mean?
The payer refunded another payer that paid this claim as primary by mistake.
Do I need to refund the other payer myself?
Usually not for the same amount. The CARC 195 amount shows the refund was already made. Send the 835 page as proof.
Is OA-195 a denial?
No. It reports a refund between payers.
What remark code comes with CARC 195?
Often N373, which explains that another payer paid as primary when it wasn’t primary.
Can I bill the patient for an OA-195 amount?
No. The amount is a payer-to-payer refund, not the patient’s share.
Sources
How we checked: each code quote on this page was matched word for word with the X12 CARC and RARC lists on 22 October 2026.
- X12, Claim Adjustment Reason Codes (CARC 195, 22, 23, 18). Accessed 22 Oct 2026.
- X12, Remittance Advice Remark Codes (N373). Accessed 22 Oct 2026.
- CMS, Coordination of benefits and recovery overview. Accessed 22 Oct 2026.
Last updated: 22 October 2026 ยท Educational content; not legal advice.