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N729 Remark Code: Missing Medical or Dental Record

N729 means the payer needed the patient's medical or dental record for the billed service and did not receive it. The claim is usually denied under CARC 252 or CARC 226 until the records for the date of service are submitted.

Quick facts

Code
N729 (RARC N729)
Status
Active In use since November 1, 2014.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): The provider is responsible while records are missing. The patient should not be billed for the denied amount.
Official description
Missing patient medical/dental record for this service.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N729 means

N729 is a straightforward documentation remark: the payer could not adjudicate this service without the patient’s record and has none. It was added to cover medical and dental claims in one code, so you will see it from both kinds of payers.

On medical claims it usually means the encounter note and related documentation for the date of service. On dental claims it can also include charting, narratives, and images. N729 typically explains CARC 252, CARC 226, or CARC 163.

Common causes

  • A prepayment review or records request was not answered.
  • The records went to the wrong address, fax, or portal queue, or were not labelled with the claim number.
  • The payer’s policy requires records for this service up front, and none were attached.
  • For dental claims, a narrative was sent without the supporting record the plan requires.

How to fix it

  1. Find the payer’s request letter or portal notice and note exactly what it asked for.
  2. Collect the signed, dated record entries for each date of service on the claim.
  3. Send them through the payer’s preferred channel, with the claim number and member ID on a cover sheet.
  4. Confirm receipt and ask whether the payer will reprocess automatically or needs a reconsideration request.
  5. If the claim is past the payer’s reopening window, use its formal appeal process.

How to prevent it

Treat payer records requests like claims with their own due dates. Keep a list of services that each payer always wants records for, and attach them electronically at submission. The CO-16 deep dive covers documentation-driven denials more broadly.

Codes that may appear with N729

  • CO-252 (An attachment/other documentation is required to adjudicate this claim/service.): Documentation is required to adjudicate; N729 names the medical or dental record.
  • CO-226 (Information requested from the Billing/Rendering Provider was not provided or not provided timely or was insufficient/incomplete.): The payer requested the record from the provider and it was not provided or was late.
  • CO-163 (Attachment/other documentation referenced on the claim was not received.): Records referenced on the claim did not arrive.
  • N730 (Incomplete/invalid patient medical/dental record for this service.): The record was received but was incomplete or invalid.
  • M127 (Missing patient medical record for this service.): An older code for a missing medical record, without the dental wording.
  • N716 (Missing chart.): Missing chart, wording some payers use for the same kind of gap.

N729 FAQ

Why does N729 mention both medical and dental records?

The code was written to work for medical and dental claims alike. On a dental claim it can include radiographs, charting, and treatment notes; on a medical claim, the encounter documentation.

How much of the record should I send?

Send the documentation for the dates of service on the claim and anything the payer's request specifies. Sending years of unrelated records rarely helps.

Is there a deadline to send records?

Payers set their own response windows for records requests and for reopening denied claims. Check the request letter or provider manual.