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Medical necessity

MN-1-1 Not justified without a supporting diagnosis

The insurer couldn’t see a diagnosis on the claim that justifies the service.

What the insurer’s message says: “[NPHIES display text for MN-1-1]”

In our own words, from the NPHIES Codeable Concept list v5.4. Reviewed by [name, role], [date].

GroupMedical necessity
Who usually fixes itThe doctor, in the visit note
Deadline15 days from the rejection

What it means

For example: An X-ray is claimed with no diagnosis that explains why it was needed.

The rejection is about the claim as it was sent, not about whether the care was right.

Why it usually happens

  • The diagnosis code is missing or too general.
  • The visit note doesn’t record the findings behind the service.
  • A diagnosis was recorded but not linked to the service line.

How to fix this claim

  1. Add or correct the diagnosis that supports the service, from the visit note.
  2. Link the diagnosis to the service line.
  3. Resend with the supporting notes, or appeal with them before the deadline.
Mind the deadline. You have 15 days from the rejection to answer it (CHI Unified Health Insurance Contract, clause 5.4). Your contract with the insurer may set a different window, so check it.

How to stop it next time

Write the diagnosis and the findings in the visit note before signing it.

This page explains the common causes. Your insurer’s policy and your contract decide each claim.

After the rejection

Nabdah keeps this rejection in front of you.

The claim is built from the signed visit, with its diagnoses linked to each line. Each rejection sits in today’s list with its reason and its appeal date, so your biller works it in time.

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CLM-2026-00961 · Insurer BRejected: MN-1-1Appeal by 22 March
Not justified without a supporting diagnosisReason
Add or correct the diagnosis that supports the service, from the visit note.
Link the diagnosis to the service line.
Sample · in today’s list, by deadline

Often seen with

AD-1-4

Diagnosis does not support the service

There is a diagnosis on the claim, but the insurer doesn’t accept it as a reason for this service.

The doctor, in the visit note
SE-1-6

Test result missing

The claim needed a test result to support it, and none was attached.

Billing, with the lab

All rejection codes