Group code OA — Other Adjustment
Informational or coordination-related adjustment. Usually means another payer is involved or there's a non-claim-related accounting entry.
Other Adjustment (OA) is a catch-all group used for coordination-of-benefits adjustments (impact of another payer), claim-level reductions tied to non-clinical factors like sequestration or prompt-pay discounts, and administrative entries that don't fit CO, PR, or PI. OA adjustments are usually informational and not appealable on their own.
How group code OA appears on your EOB
Every adjustment line on an insurance Explanation of Benefits (or 835 Electronic Remittance Advice) has a group code and at least one reason code (CARC). The group code is the “who”: OA means Other Adjustment. The CARC is the “why”: a specific numeric reason like 50 (not medically necessary), 197 (prior auth absent), or 204 (not covered under benefit plan).
All four group codes
For context, the four X12 adjustment group codes are:
- CO — Contractual Obligation: Contractual write-off. The provider agreed to the rate. Patient does NOT owe this amount.
- PR — Patient Responsibility: Patient owes this amount. Deductibles, coinsurance, copays, and excluded benefits land here.
- OA — Other Adjustment: Informational or coordination-related adjustment. Usually means another payer is involved or there's a non-claim-related accounting entry.
- PI — Payer Initiated Reductions: Payer reduced the payment for a reason that is neither contractual nor patient responsibility. Often appealable.
Frequently asked questions
Is an OA adjustment appealable?
Usually not on its own. OA codes typically reflect coordination-of-benefits accounting, regulatory pass-throughs, or administrative entries. If the OA amount is wrong (e.g., the primary payer paid more than the OA shows), the dispute is with the secondary payer's accounting, not a clinical appeal.
What's a common OA code I'll see?
OA-23 (impact of prior payer's adjudication) is the most common — it appears on secondary payer EOBs when the primary already adjudicated the claim. OA-100 (payment made to patient/insured) appears when the carrier paid the patient directly instead of the provider.
Common CARC codes under group OA
- CARC 23 — The impact of prior payer(s) adjudication including payments…
- CARC 44 — Prompt-pay discount.
- CARC 100 — Payment made to patient/insured/responsible party.
- CARC 101 — Predetermination — anticipated payment upon completion of se…
- CARC 102 — Major Medical Adjustment.
- CARC 103 — Provider promotional discount.
- CARC 104 — Managed care withholding.
- CARC 105 — Tax withholding.
- CARC 118 — ESRD network support adjustment.
- CARC 131 — Claim specific negotiated discount.
Sources
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