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N901 Remark Code: Therapy Notes Incomplete or Invalid

N901 means the payer received therapy notes or a therapy report, but found them incomplete or invalid. Required elements such as signatures, time, treatment details, or progress toward goals may be missing, so the notes did not support the services billed.

Quick facts

Code
N901 (RARC N901)
Status
Active In use since July 1, 2024.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): Therapy charges the documentation did not support. The provider is responsible; the patient is not billed.
Official description
Incomplete/Invalid Therapy Notes/Report.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N901 means

Unlike N900, which means nothing arrived, N901 means the notes arrived and failed review. The reviewer could not match what was documented to what was billed.

“Incomplete” usually means a required element is missing. “Invalid” can mean the notes are unsigned, belong to a different date or patient, or were not written by a qualified clinician.

Common causes

  • Timed services billed without documented minutes, or minutes that do not support the units.
  • Missing therapist signature or credentials.
  • Notes that repeat the same text each visit without showing skilled care or progress.
  • The plan of care was not certified or had lapsed for the billed dates, where the payer requires it.
  • Documentation for the wrong date of service.

How to fix it

  1. Read the denial and any reviewer comments to find the specific gap.
  2. Check the notes against the billed lines: dates, units, services, and signature.
  3. Correct the claim if the billing was wrong, for example resubmit with the correct units using frequency code 7.
  4. Appeal if the notes support the service, pointing the reviewer to the relevant sections.

How to prevent it

Use documentation templates that require time, interventions, and response for each visit, and audit a sample of notes against billed units each month.

Codes that may appear with N901

  • CO-251 (The attachment/other documentation that was received was incomplete or deficient.): The documentation received was incomplete or deficient.
  • CO-50 (These are non-covered services because this is not deemed a 'medical necessity' by the payer.): Services judged not medically necessary based on the documentation.
  • CO-151 (Payment adjusted because the payer deems the information submitted does not support this many/frequency of services.): The information does not support the number or frequency of services.
  • N900 (Missing Therapy Notes/Report.): The therapy notes were never received.
  • N466 (Incomplete/invalid Physical Therapy Notes/Report.): The physical therapy-specific version for incomplete or invalid notes.
  • N768 (Incomplete/invalid initial evaluation report.): The initial evaluation, rather than treatment notes, is incomplete or invalid.

N901 FAQ

What do payers look for in therapy notes?

Commonly the date, the specific interventions, the time spent for timed services, the patient's response, progress toward goals, and a legible signature with credentials. Requirements vary by payer.

Can I add to the notes after the denial?

Late entries must follow your organization's amendment policy and be clearly dated as late. Altering records to win an appeal creates compliance risk.

Should I appeal or rebill?

If the original notes support the service and the payer misread them, appeal with an explanation. If the claim itself had errors, such as wrong units, correct and resubmit.