N674 remark code

Remittance advice remark code N674. Remark codes add detail to the reason code on the same claim line.

Required earlier service not done

Unofficial reference. This is our own plain-English explanation, not the official code text. Payer rules differ. Verify with the payer and the official X12 code list. AlphaPrefix is not affiliated with X12, CMS or any payer. Data last updated Nov 11, 2026.

What N674 means

This service is covered only after a prerequisite service, and the payer has no record that it was provided.

Some coverage rules require a step to happen first, such as an evaluation before therapy or a trial of a simpler treatment before a more involved one. N674 means the payer did not find that earlier service.

It explains the reason code on the line, often a medical necessity or benefit reason code.

Common causes

• The prerequisite service was done elsewhere and never billed to this payer.
• The prerequisite was billed on a later date than the service that depends on it.
• The patient skipped the required first step in the treatment sequence.

What to do next

1. Check the payer's policy for which service has to come first.
2. Find out whether the prerequisite was done and by whom.
3. Appeal with records showing the prerequisite if it was performed but not billed to this payer.
4. Schedule the prerequisite service first on future cases for this payer.

Related codes

• N130 (remark code) Check plan benefits for restrictions
• N54 (remark code) Does not match the authorization
• 50 (reason code) Not medically necessary per the payer