Skip to main content

N769 Remark Code: Lateral Diagnosis Required

N769 means a lateral diagnosis is required. The payer needs an ICD-10-CM code that specifies the side of the body affected, such as right, left, or bilateral, rather than an unspecified-side code.

Quick facts

Code
N769 (RARC N769)
Status
Active In use since March 1, 2016.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): The claim is denied as a coding issue for the provider to correct. Not patient responsibility.
Official description
A lateral diagnosis is required.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N769 means

ICD-10-CM builds laterality into many codes: separate codes, or code characters, identify the right side, the left side, both sides, or an unspecified side. N769 says the payer requires a code that specifies the side, and the claim did not provide one.

It usually pairs with CARC 16 or CARC 11. The typical trigger is an “unspecified side” diagnosis on a service where the side is obviously known, such as a procedure performed on one knee or eye.

Common causes

  • The provider selected an unspecified-side code from a favorites list.
  • The note documents the side, but the coder did not carry it into the code.
  • The diagnosis side conflicts with the procedure modifier, such as a left-side diagnosis on an RT line.
  • A bilateral condition was coded as one side only, or vice versa.

How to fix it

  1. Review the documentation for the side of the condition.
  2. If the side is documented, assign the correct lateral code in box 21 and check that box 24E points to it.
  3. If the side is not documented, query the provider before recoding.
  4. Make sure procedure modifiers such as RT, LT, or 50 agree with the diagnosis.
  5. Submit a corrected claim with resubmission code 7 and the original claim number.

How to prevent it

Remove unspecified-side codes from quick-pick lists where the side is always known, and add a claim edit that flags unspecified laterality when a procedure carries a side modifier. A pre-submission claim check can catch these mismatches.

Codes that may appear with N769

  • CO-16 (Claim/service lacks information or has submission/billing error(s).): The claim lacks information, here the laterality of the diagnosis.
  • CO-11 (The diagnosis is inconsistent with the procedure.): The diagnosis is inconsistent with the procedure, which can include a side mismatch.
  • CO-146 (Diagnosis was invalid for the date(s) of service reported.): The diagnosis was invalid for the dates of service.
  • M76 (Missing/incomplete/invalid diagnosis or condition.): The diagnosis is missing or invalid in a more general sense.
  • N644 (Reimbursement has been made according to the bilateral procedure rule.): Reimbursement was made under the bilateral procedure rule, a procedure-side payment rule.
  • N569 (Not covered when performed for the reported diagnosis.): The service is not covered for the reported diagnosis.

N769 FAQ

What is laterality in ICD-10-CM?

Many ICD-10-CM codes include a character that identifies right, left, bilateral, or unspecified side. Laterality shows which side of the body the condition affects.

Can I use an unspecified-side code if the note doesn't say?

Coding follows the documentation. If the side is not documented, query the provider rather than guessing. Some payers deny unspecified-side codes when a specific code exists.

Does the diagnosis side need to match procedure modifiers?

It should. If the procedure line carries a modifier such as RT or LT, the diagnosis pointed to in box 24E should describe the same side.