OA 209 denial code

Claim adjustment reason code 209. Often reported as OA 209.

Not collectible from the patient

Unofficial reference. This is our own plain-English explanation, not the official code text. Payer rules differ. Verify with the payer and the official X12 code list. AlphaPrefix is not affiliated with X12, CMS or any payer. Data last updated Nov 11, 2026.

What 209 means

A rule or agreement shields the patient from this amount, though another payer down the line may still pick it up.

The payer is telling you two things. The patient is protected from this amount, and another payer down the line may still pay it.

It is used only with group code OA. If the patient already paid this amount, it must be refunded to them.

Group codes seen with 209

On a remittance, 209 comes after a group code. These are the ones it is most often reported with:

• OA 209 (Other Adjustment): Used for adjustments that are neither the provider's contractual write-off nor the patient's share. It often appears with coordination of benefits, for example when another payer already paid.

The payer chooses the group code for each adjustment, so the same reason code can appear with another group code on your remittance. Read the two together. More about group codes.

Common causes

• A regulation or agreement protects the patient from the amount, such as rules for certain dual eligible patients.
• A balance remains after this payer's processing that a secondary payer may pick up.
• The patient's status prevents cost sharing collection by the provider.

What to do next

1. Bill any secondary or tertiary payer for the amount, with this remittance attached.
2. Make sure the amount is not on the patient's statement.
3. Refund the patient if they already paid any part of this amount.

Related codes

• 23 (reason code) Prior payer payment affected this claim
• 22 (reason code) Another payer may be primary
• N781 (remark code) QMB or Medicaid patient: deductible