Skip to main content

M134 Remark Code: Provider Has Financial Interest

M134 means the service was performed by a facility or supplier in which the provider has a financial interest. Payers use it when self-referral or financial-relationship rules affect whether the service can be paid.

Quick facts

Code
M134 (RARC M134)
Status
Active In use since January 1, 1997; last modified June 30, 2003.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): If the service is denied under financial-relationship rules, the amount is generally not collectible from the patient.
Official description
Performed by a facility/supplier in which the provider has a financial interest.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What M134 means

When a physician refers a patient to a facility or supplier in which they, or an immediate family member, have an ownership or compensation interest, special rules can apply. Medicare’s physician self-referral law restricts payment for certain designated health services referred under such relationships, unless an exception is met. Other payers and state laws may have similar rules.

M134 tells you that the payer identified such a financial interest as relevant to this claim. The CARC shows the outcome, which is often a denial.

This page does not offer legal conclusions. Whether a specific arrangement meets an exception depends on its facts.

Common causes

  • A referral to an imaging center, lab, or other entity that the referring physician partly owns.
  • Compensation arrangements that the payer believes do not meet an exception.
  • Disclosure forms or enrollment records that reveal the relationship.
  • Referring provider information in box 17 and 17b matched against ownership records.

What to do

  1. Review the claim to confirm the referring provider and the performing entity.
  2. Involve compliance or legal counsel to assess whether an exception applies to the arrangement.
  3. If you believe an exception applies, request reconsideration or appeal with supporting documentation.
  4. If the denial is valid, do not bill the patient, and ask counsel whether other claims or refunds are affected.

How to prevent problems

  • Keep an up-to-date inventory of financial relationships between referring physicians and service entities.
  • Review arrangements for exceptions before they begin, not after claims deny.
  • Keep ownership disclosures in enrollment records accurate; see provider enrollment denials.

Codes that may appear with M134

  • CO-B7 (This provider was not certified/eligible to be paid for this procedure/service on this date of service.): The provider was not eligible to be paid for this service on this date.
  • CO-A1 (Claim/Service denied.): The claim or service was denied, with M134 explaining the financial-interest reason.
  • M131 (Missing physician financial relationship form.): A physician financial relationship form was missing.
  • N239 (Incomplete/invalid physician financial relationship form.): The financial relationship form was incomplete or invalid.

M134 FAQ

Why does a financial interest matter?

Federal self-referral rules, often called the Stark Law, restrict Medicare payment for certain services when the referring physician has a financial relationship with the entity, unless an exception applies.

Does M134 mean a violation occurred?

Not necessarily. It explains the basis of the payer's decision. Whether an exception applies is a legal question to review with compliance counsel.

Can the patient be billed?

Generally no when services are denied under self-referral rules; amounts collected may need to be refunded. Confirm with compliance advisers.