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N307 Remark Code: Adjudication or Payment Date

N307 means the adjudication or payment date was missing, incomplete, or invalid. On secondary claims this is the date the prior payer processed or paid the claim, which the secondary payer needs to coordinate benefits.

Quick facts

Code
N307 (RARC N307)
Status
Active In use since December 2, 2004.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): A correctable coordination of benefits error; the patient is not billed for this adjustment.
  • OA (Other Adjustment): Some payers report incomplete prior-payer data under OA pending corrected COB information.
Official description
Missing/incomplete/invalid adjudication or payment date.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N307 means

When you bill a secondary payer electronically, you report what the primary payer did: how much it paid, which adjustments it applied, and when it adjudicated the claim. The date matters because secondary payers apply timely filing and coordination rules relative to the primary’s decision. N307 means that date wasn’t there or couldn’t be used.

It is a COB data remark, usually alongside CARC 16.

Common causes

  • Paid amounts and adjustments were entered for the other payer, but the adjudication date was skipped.
  • Line-level adjudication data was sent without a date for each line.
  • The date recorded was the posting date or deposit date, not the payer’s adjudication date.
  • The primary payer reprocessed the claim, and the secondary claim still carries the original date.
  • The date was entered in the wrong format or is after the secondary claim’s submission date.

What to do

  1. Pull the primary ERA or EOB for the claim and note the adjudication or payment date.
  2. If the primary reprocessed the claim, use the date tied to the final processing you are reporting.
  3. Enter the date wherever the secondary payer requires it, at claim level, line level, or both.
  4. Verify the rest of the COB data (paid amounts, adjustments, group codes) is consistent with the same ERA.
  5. Send a replacement claim with frequency code 7.

How to prevent it

Automate secondary claim creation from posted primary ERAs so the adjudication date comes straight from the 835 data. Where secondary claims must be keyed by hand, make the date a required field. Our eligibility and COB guide covers the full set of COB data points secondary payers check.

Codes that may appear with N307

  • CO-16 (Claim/service lacks information or has submission/billing error(s).): Missing or invalid information; N307 names the adjudication or payment date.
  • OA-22 (This care may be covered by another payer per coordination of benefits.): Coordination of benefits applies and the payer needs complete prior-payer details.
  • OA-23 (The impact of prior payer(s) adjudication including payments and/or adjustments. (Use only with Group Code OA)): Reports the impact of the prior payer's adjudication, which relies on accurate COB data.
  • MA04 (Secondary payment cannot be considered without the identity of or payment information from the primary payer.): Secondary payment can't be considered without the primary payer's identity or payment information.
  • N479 (Missing Explanation of Benefits (Coordination of Benefits or Medicare Secondary Payer).): The explanation of benefits from the prior payer is missing.
  • N4 (Missing/Incomplete/Invalid prior Insurance Carrier(s)): The prior payer's EOB is missing, incomplete, or invalid.

N307 FAQ

Where do I find the adjudication date?

On the primary payer's ERA or EOB. It is the date the primary processed the claim or issued payment, depending on how the secondary payer's instructions describe it.

Where does it go on an electronic claim?

In the other-payer adjudication information on the 837, alongside the prior payer's paid amounts and adjustments. Claim-level and line-level adjudication data may each need a date.

Can I use the date I received the payment?

Not usually. Use the date reported by the primary payer, not the date the money reached your bank or was posted.