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N751 Remark Code: Patient Has Medicare Part D Coverage

N751 means the payer adjusted this claim because the patient is covered under a Medicare Part D plan. The drug or item is generally expected to be billed to the patient's Part D prescription drug plan rather than to the payer that sent N751.

Quick facts

Code
N751 (RARC N751)
Status
Active In use since March 1, 2015; last modified July 1, 2017.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): The payer will not cover the item because Part D is the appropriate coverage. The provider should bill Part D, not the patient.
  • OA (Other Adjustment): Used by some payers to show another payer, the Part D plan, is responsible.
Official description
Adjusted because the patient is covered under a Medicare Part D plan.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N751 means

Medicare splits drug coverage between Part B, which covers certain drugs administered in medical settings and some specific categories, and Part D, the prescription drug benefit run by private plans. N751 tells you the payer considered this item Part D territory because the patient has a Part D plan.

The remark usually pairs with CARC 109 or CARC 22. It is not a statement that the drug is not covered at all; it is a statement about which part of Medicare coverage should pay.

Common causes

  • A self-administered drug was billed on a medical claim.
  • The drug is covered by Part B only in specific situations, and the claim did not show that situation applied.
  • A supplier billed a drug to the DME contractor that Part D should cover for this patient.
  • A Medicare Advantage plan applied its own Part B versus Part D rules.

How to fix it

  1. Confirm whether the drug, in the way it was administered, falls under Part B or Part D for this patient.
  2. If Part B should apply, check the coding, route, and supporting documentation, and send a corrected claim with resubmission code 7.
  3. If Part D applies, bill the patient’s Part D plan through a pharmacy channel, or arrange for the patient to obtain the drug through a network pharmacy.
  4. Keep documentation of the determination in the patient record.

How to prevent it

Maintain a list of drugs your practice administers that fall on the Part B/Part D line, and verify Part D coverage when those drugs are ordered. For coverage-routing problems generally, see eligibility and COB denials.

Codes that may appear with N751

  • CO-109 (Claim/service not covered by this payer/contractor.): The claim is not covered by this payer and must go to the correct payer.
  • OA-22 (This care may be covered by another payer per coordination of benefits.): Another payer may cover this care under coordination of benefits.
  • CO-96 (Non-covered charge(s).): A non-covered charge under this benefit, explained by Part D coverage.
  • 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 portion of the benefit package.
  • M119 (Missing/incomplete/invalid/ deactivated/withdrawn National Drug Code (NDC).): The National Drug Code is missing or invalid, a separate drug billing issue.
  • PR-204 (This service/equipment/drug is not covered under the patient's current benefit plan): The drug or service is not covered under the patient's current benefit plan.

N751 FAQ

Which drugs does N751 affect?

Usually drugs that Medicare Part B does not cover in the circumstances billed, such as many self-administered drugs, and that fall under the patient's Part D plan. Coverage splits between Part B and Part D can be complex.

How do I bill Part D?

Part D drugs are usually billed by a pharmacy through the pharmacy claims system. If your practice is not set up to do that, the patient may need to fill the prescription at a network pharmacy.

Can I bill the patient after N751?

Not as a first step. The drug may be covered by Part D. Check your options for billing Part D, and any rules on advance notice, before considering patient billing.