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N236 Remark Code: Incomplete or Invalid Pathology Report

N236 means the pathology report sent to support the claim was incomplete or invalid, for example a preliminary report, one without the pathologist's signature, or one that does not match the specimen, date, or service billed.

Quick facts

Code
N236 (RARC N236)
Status
Active In use since August 1, 2004.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): The service was denied or held for documentation. The provider or lab supplies a valid report; the patient is not liable for the defect.
Official description
Incomplete/invalid pathology report.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N236 means

Pathology results connect a procedure to a confirmed diagnosis. Payers may review them for excisions, biopsies, and other tissue procedures, and for pathology services themselves. N236 says the report they received could not be used. It usually explains CARC 252, and sometimes CARC 50 or CARC 11.

The report often comes from another organisation, the pathology lab, which is why these requests can take time to fulfil.

Why reports get rejected

  • It is a preliminary or pending report rather than a final diagnosis.
  • The pathologist’s electronic or physical signature is missing.
  • Specimen labels do not line up with the lesion sites or number of specimens billed.
  • The collection date differs from the date of service on the claim.
  • An addendum changed the diagnosis, but only the original report was sent.

How to fix it

  1. Request the final, signed pathology report and any addenda from the lab.
  2. Match the specimens in the report to the procedure lines on the claim, including site and count.
  3. If the final pathology changes the correct code or diagnosis, submit a corrected claim with resubmission code 7 and the original claim number.
  4. Send the report through the payer’s attachment method with the claim reference.

How to prevent it

Hold claims for procedures where coding depends on pathology until the final report is received. Interfaces that bring final pathology reports straight into the chart reduce delays and errors.

Codes that may appear with N236

  • CO-252 (An attachment/other documentation is required to adjudicate this claim/service.): Documentation, the pathology report, is required to adjudicate the claim.
  • CO-50 (These are non-covered services because this is not deemed a 'medical necessity' by the payer.): The payer could not confirm medical necessity without a usable report.
  • CO-11 (The diagnosis is inconsistent with the procedure.): The diagnosis is inconsistent with the procedure, which the final pathology can clarify.
  • M30 (Missing pathology report.): The pathology report was missing entirely.
  • N233 (Incomplete/invalid operative note/report.): The operative note or report was incomplete or invalid.
  • N181 (Additional information is required from another provider involved in this service.): Information is needed from another provider involved in the service, such as the pathology lab.

N236 FAQ

Why would a surgeon's claim need a pathology report?

Payers sometimes use pathology to confirm the diagnosis or the nature of what was removed, for example to distinguish a benign lesion from a malignant one, which can affect coding and coverage.

Where do I get the report?

From the pathology lab or hospital pathology department. Many practices receive final reports through an interface or portal.

Is a preliminary report acceptable?

Usually not. Send the final, signed report, and include any addenda.