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M41 Remark Code: Patient Has No Legal Obligation to Pay

M41 means the payer denied the service because the patient has no legal obligation to pay for it. If the patient would not owe anything, the payer does not pay either.

Quick facts

Code
M41 (RARC M41)
Status
Active In use since January 1, 1997.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): The provider absorbs the amount. Because the patient has no obligation to pay, they cannot be billed.
Official description
We do not pay for this as the patient has no legal obligation to pay for this.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What M41 means

Medicare and many other payers exclude services for which the patient has no legal obligation to pay. The logic is simple: insurance covers what the patient would otherwise owe. If a program, sponsor, or provider arrangement means the patient never owes anything, the payer does not step in. M41 says the payer applied that exclusion.

It is a Medicare-derived remark, usually paired with CARC 96.

Common causes

  • The provider offers the service free of charge to uninsured patients, but bills insured ones.
  • The service was part of a research study where the sponsor pays for study items.
  • A public agency or program already covers the service.
  • The provider is an immediate relative or member of the patient’s household.
  • Services were provided under a contract with an employer or school that pays for them.

What to do

  1. Identify why the payer believes the patient owes nothing. Call provider services if the reason is unclear.
  2. If the facts are wrong, gather evidence that the patient is normally billed for this service and appeal.
  3. If the exclusion applies, write off the charge and do not bill the patient.
  4. Review research and grant-funded services so sponsor-paid items are not billed to insurance.

How to prevent it

Keep a clear policy on which services are free or sponsor-covered and flag them in your charge capture so they are not billed to payers. For more on reading coverage exclusions, see CARC and RARC denial analysis.

Codes that may appear with M41

  • CO-96 (Non-covered charge(s).): The charge is non-covered because of the no-legal-obligation exclusion.
  • CO-109 (Claim/service not covered by this payer/contractor.): The service is covered by another entity, such as a government program or free service arrangement.
  • N216 (We do not offer coverage for this type of service or the patient is not enrolled in this portion of our benefit package.): The patient is not enrolled in this part of the benefit package, a different kind of coverage exclusion.
  • OA-209 (Per regulatory or other agreement.): The provider cannot collect the amount from the patient under a regulatory or other agreement.
  • CO-96 (Non-covered charge(s).): The general non-covered reason code that usually carries M41.

M41 FAQ

When does a patient have no legal obligation to pay?

Common examples include services the provider offers free to everyone, services paid by a government agency, services covered by a research sponsor, and some care provided by close relatives or household members.

Can I bill the patient after M41?

No. The premise of the denial is that the patient owes nothing for the service.

What if we do charge everyone for this service?

Appeal with evidence that the patient is normally billed, such as your fee schedule and collection policy.