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OA-257 Code: Undetermined During Exchange Grace Period

OA-257 means the claim's disposition is undetermined because the member is in a premium payment grace period under Health Insurance Exchange rules. The claim will be reversed and corrected when the grace period ends, depending on whether the premium is paid. X12 allows it only with group code OA.

Quick facts

Code
OA-257 (CARC 257)
Status
Active In use since November 1, 2013; last modified June 1, 2014.
Code set
Claim Adjustment Reason Codes (CARC)
Group codes
  • OA (Other Adjustment): X12 restricts CARC 257 to the OA group. The amount is neither paid nor assigned to anyone yet; it is waiting for the grace period to end.
Official description
The disposition of the claim/service is undetermined during the premium payment grace period, per Health Insurance Exchange requirements. This claim/service will be reversed and corrected when the grace period ends (due to premium payment or lack of premium payment). (Use only with Group Code OA)
X12 Claim Adjustment Reason Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What OA-257 means

CARC 257 says the disposition of the claim or service is undetermined during the premium payment grace period, per Health Insurance Exchange requirements. It goes on: this claim will be reversed and corrected when the grace period ends, either because the premium was paid or because it was not. It is used only with group code OA, and X12 notes it is to be used after the first month of the grace period.

The background is the federal grace period for Marketplace enrollees who receive advance payments of the premium tax credit. When such an enrollee stops paying premiums, the plan must keep coverage for a grace period, generally three months. Claims for the first month are paid. Claims for services in the second and third months can be pended, and OA-257 is how the plan reports that pend.

So OA-257 is not a denial yet. It is a placeholder that will turn into a payment or a denial once the member’s premium status is resolved.

Common causes

  • Member behind on premiums while receiving advance premium tax credits.
  • Service dates in the second or third month of the grace period.
  • Premium payment in transit at the time the claim was processed.

How to handle it

  1. Do not write it off. Keep the claim open in a separate follow-up queue.
  2. Tell the patient their coverage is in a grace period and that paying the premium lets claims process.
  3. Watch for the reversal remittance. If the premium is paid, the plan should reprocess and pay without a new claim.
  4. If coverage terminates, the plan will deny the claim, often with a coverage-terminated code. Then follow your financial policy for billing the patient.
  5. Avoid resubmitting during the pend, which can create duplicates.

How to prevent problems

  • Run eligibility before each visit and look for grace-period alerts in the response.
  • For patients in a grace period, discuss financial arrangements before non-urgent services.
  • Track pended claims by grace-period end date so follow-up happens promptly.
  • See eligibility and COB denials for more on verifying coverage status.

Remark codes that may appear with OA-257

  • N617 (This enrollee is in the second or third month of the advance premium tax credit grace period.): The enrollee is in the second or third month of the advance premium tax credit grace period.
  • N615 (Alert: This enrollee receiving advance payments of the premium tax credit is in the grace period of three consecutive months for non-payment of…): Alert that the enrollee receiving advance premium tax credits is in the three-month grace period.
  • N698 (Alert: This reversal is due to non-payment of the health insurance premiums (Health Insurance Exchange or other) by the end of the premium payment…): Appears on a later reversal when the premium was not paid.
  • PR-27 (Expenses incurred after coverage terminated.): Expenses incurred after coverage terminated, which may follow if the grace period ends without payment.
  • CO-200 (Expenses incurred during lapse in coverage): Expenses incurred during a lapse in coverage.
  • CO-177 (Patient has not met the required eligibility requirements.): The patient did not meet eligibility requirements.

OA-257 FAQ

What is the Marketplace grace period?

Enrollees receiving advance premium tax credits who fall behind on premiums generally get a three-month grace period. The plan pays claims in the first month, but may pend claims for services in the second and third months until it knows whether premiums are paid.

What happens to an OA-257 claim if the premium is paid?

The plan reverses the pend and processes the claim normally, usually with a new remittance showing the payment.

What if the premium is never paid?

Coverage generally ends retroactively to the end of the first grace month, and the plan denies the pended claims. The provider may then bill the patient according to its policy and applicable rules.

Does OA-257 apply to employer plans?

No. It is specific to Health Insurance Exchange (Marketplace) grace-period rules. Employer and other plans have their own rules for unpaid premiums and use other codes.