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M83 Remark Code: Covered Only for High-Risk Patients

M83 means the service is not covered unless the patient is classified as high risk, and the claim did not establish that status. Payers usually expect a qualifying diagnosis code that documents the risk factor.

Quick facts

Code
M83 (RARC M83)
Status
Active In use since January 1, 1997.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): The service is denied as not meeting coverage criteria, and the provider absorbs it unless a valid patient agreement exists.
  • PR (Patient Responsibility): The patient is held responsible, usually because an advance notice of non-coverage was signed.
Official description
Service is not covered unless the patient is classified as at high risk.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What M83 means

Certain services, commonly screenings, are covered for the general population only at set intervals or ages, but may be covered more often or earlier for patients at elevated risk. M83 says the payer applied that kind of rule and did not see evidence of high risk on your claim.

The payer is not saying the patient is low risk. It is saying the claim did not prove otherwise. That distinction matters because the fix is often in the coding, if the record supports it.

Common causes

  • The risk factor was documented in the chart but not coded, for example a relevant personal or family history.
  • A routine screening diagnosis was listed first with the risk diagnosis missing or pointed to the wrong line.
  • The service was repeated sooner than the average-risk interval without high-risk support.
  • A high-risk modifier or screening HCPCS code the payer requires was not used.

How to fix it

  1. Look up the payer’s coverage policy for the service and the list of qualifying risk diagnoses.
  2. Review the record to see whether the patient meets the criteria and whether the provider documented it.
  3. If documented, add the qualifying ICD-10-CM codes, link them in box 24E, and send a corrected claim with frequency code 7.
  4. If not documented but true, ask the provider whether an addendum is appropriate under your compliance policy.
  5. If the patient is not high risk, bill the patient only where a signed advance notice allows it.

How to prevent it

  • Capture history and risk factors during intake and make sure they reach the claim.
  • Check screening frequency and risk requirements before scheduling.
  • Include the right risk diagnoses on orders so the rendering provider has them.

Codes that may appear with M83

  • CO-50 (These are non-covered services because this is not deemed a 'medical necessity' by the payer.): The service was not considered medically necessary for a patient not documented as high risk.
  • CO-96 (Non-covered charge(s).): Non-covered charge, with M83 identifying the missing risk classification.
  • CO-11 (The diagnosis is inconsistent with the procedure.): The diagnosis reported does not support the service without a risk indicator.
  • M82 (Service is not covered when patient is under age 50.): An age-based coverage limit rather than a risk-based one.
  • N386 (This decision was based on a National Coverage Determination (NCD).): Tells you the decision was based on a National Coverage Determination, which may define high-risk criteria.
  • N115 (This decision was based on a Local Coverage Determination (LCD).): Tells you the decision was based on a Local Coverage Determination.

M83 FAQ

How does a payer know the patient is high risk?

Mostly from the diagnosis codes on the claim. Coverage policies often list personal or family history, conditions, or other risk-factor codes that qualify.

Can I just add a risk diagnosis?

Only if the medical record documents that risk factor. Adding codes that are not supported by documentation is not appropriate.

What screening intervals apply to high-risk patients?

They vary by service and payer. Many policies allow more frequent screening for high-risk patients, so check the specific coverage policy.