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N9 Remark Code: Estimated Previous Payer Amount

N9 means the adjustment on the claim represents the payer's estimate of what a previous (primary) payer may pay. The payer reduced its own payment by that estimate instead of using actual primary payment data.

Quick facts

Code
N9 (RARC N9)
Status
Active In use since January 1, 2000; last modified November 18, 2005.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • OA (Other Adjustment): The estimated amount is set aside as another payer's expected share, not a provider write-off or a patient balance.
  • CO (Contractual Obligation): Some payers report the estimated offset under CO. It still represents an expected payment from another carrier, so do not write it off without pursuing the primary.
Official description
Adjustment represents the estimated amount a previous payer may pay.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N9 means

Normally a secondary payer calculates its payment from the primary payer’s actual adjudication. N9 signals that the payer did not have those actual numbers, so it plugged in an estimate of what the prior payer may pay and adjusted its own payment by that amount.

The estimate is not a final reconciliation. It is a placeholder that stays in effect until someone supplies real primary payment information or proves there is no other coverage. N9 usually appears with CARC 22 or CARC 23.

Common causes

  • The claim went to this payer without the primary payer’s payment and adjustment data.
  • The payer’s records show other coverage the patient did not report at registration.
  • Coordination of benefits information on file with the payer is outdated.

What to do

  1. Confirm the coverage order. Ask the patient about other insurance and verify it with an eligibility check.
  2. If another plan is primary, bill that plan and wait for its remittance.
  3. Send actual numbers to this payer. Submit a corrected claim (resubmission code 7) with the primary’s paid amount and line-level adjustments, replacing the estimate.
  4. If there is no other coverage, ask the patient to update their COB record with the payer, then request reprocessing.
  5. Track the open balance under the other payer, not as a write-off, until it resolves.

How to prevent it

Collect other-insurance details at every visit and confirm them against eligibility responses before billing. Hold secondary claims until the primary ERA posts so actual figures are included from the start. See eligibility and COB root causes for a deeper look.

Codes that may appear with N9

  • OA-22 (This care may be covered by another payer per coordination of benefits.): The service may be covered by another payer under coordination of benefits, which is why an estimate was applied.
  • OA-23 (The impact of prior payer(s) adjudication including payments and/or adjustments. (Use only with Group Code OA)): Reports the impact of prior payer adjudication; with N9 that impact is estimated rather than actual.
  • N219 (Payment based on previous payer's allowed amount.): Payment based on the prior payer's actual allowed amount, not an estimate.
  • N4 (Missing/Incomplete/Invalid prior Insurance Carrier(s)): The prior carrier's EOB was missing or invalid, which can lead a payer to estimate or deny.
  • N48 (Claim information does not agree with information received from other insurance carrier.): Your claim data does not agree with what another insurer reported.

N9 FAQ

Why would a payer estimate another payer's share?

When it believes other coverage exists but has no EOB or payment data, a payer may reduce its payment by an estimated amount instead of denying the claim outright. Policies on this vary by payer.

Do I bill the estimate to the patient?

No. The estimate represents money expected from the other carrier. Bill that payer, then send its actual results back to this payer.

What if the patient has no other coverage?

Have the patient update their coordination of benefits information with the payer, then ask the payer to reprocess the claim without the estimated offset.