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N910 Remark Code: MFP Refund Not Available Yet

N910 means the manufacturer cannot provide a Maximum Fair Price refund for this claim at this time. The remark directs the dispensing entity to contact the manufacturer directly about its eligibility for a refund. It is used only in the Medicare Drug Price Negotiation Program.

Quick facts

Code
N910 (RARC N910)
Status
Active In use since March 1, 2025.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): Where present, represents the refund that has not been paid. It is not collectible from the Medicare patient.
Official description
A refund cannot be provided for this claim at this time. Contact the manufacturer directly regarding your eligibility.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N910 means

N910 is the least specific of the Maximum Fair Price refund remarks. Other codes in the series tell you exactly why a refund is zero or different: 340B pricing, an up-front MFP purchase, compounded drugs, or plan data errors. N910 only says the manufacturer cannot pay a refund right now and that the answer lies with the manufacturer.

For a pharmacy, the practical meaning is a refund you expected but have not received, with no stated reason.

What to do

  1. Contact the manufacturer named for the drug, using its MFP effectuation contact channel.
  2. Ask specifically what eligibility issue is blocking payment and what documentation will resolve it.
  3. Check your own setup, such as enrollment with the program’s facilitator and payment details on file.
  4. Track the claim in an open-refund log, and follow up until you receive payment or a final determination.
  5. Use the dispute process if the manufacturer denies eligibility and you disagree.

Unpaid MFP refunds can add up quickly for pharmacies that dispense selected drugs often, so treat N910 claims as open receivables rather than write-offs.

Codes that may appear with N910

  • CO-307 (Medicare Maximum Fair Price Standard Default Refund Amount Adjustment.): The standard default refund adjustment that has not been paid on this claim.
  • N911 (This claim cannot be reimbursed by the manufacturer until the Part D plan submits corrected prescription drug event data to CMS for maximum fair…): The refund is held specifically until the Part D plan corrects its prescription drug event data.
  • N907 (No refund because this claim has been identified as 340B-eligible with a ceiling price lower than the maximum fair price.): No refund because a lower 340B price applies.
  • N918 (No refund because CMS excludes prescription drug event records when a compound code indicates it is for a compounded drug.): No refund because the record is a compounded drug.

N910 FAQ

Is N910 a permanent denial?

The remark says the refund cannot be provided at this time, which suggests the issue may be resolvable. The manufacturer can tell you what is needed.

What eligibility issues are common?

The remark does not specify. Questions may involve the dispensing entity's enrollment or payment information, the claim's data, or other program requirements.

Should I contact CMS or the plan?

The remark points you to the manufacturer first. Program-level problems may need CMS's facilitator or the Part D plan, depending on what the manufacturer finds.