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N911 Remark Code: Waiting on Corrected Part D PDE Data

N911 means the manufacturer cannot reimburse the claim until the Part D plan submits corrected prescription drug event (PDE) data to CMS for maximum fair price validation. The hold is caused by plan data, not by the pharmacy's refund request. It is used only in the Medicare Drug Price Negotiation Program.

Quick facts

Code
N911 (RARC N911)
Status
Active In use since March 1, 2025.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): If reported, reflects the refund amount on hold. It is not a patient balance.
Official description
This claim cannot be reimbursed by the manufacturer until the Part D plan submits corrected prescription drug event data to CMS for maximum fair price validation.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N911 means

The Maximum Fair Price refund depends on data flowing from the pharmacy claim to the Part D plan, then from the plan to CMS as a prescription drug event record, and finally to the manufacturer. If that PDE record contains errors, the MFP cannot be validated and the manufacturer will not pay.

N911 says that is what happened. The manufacturer is not rejecting your refund; it is waiting for the plan to fix its data.

Common causes

  • The quantity, days’ supply, or NDC on the PDE does not match the pharmacy claim.
  • The plan reported pricing fields that do not validate against the MFP.
  • The pharmacy claim itself had an error that carried into the PDE.

What to do

  1. Review your pharmacy claim for the fill. If you find an error, reverse and resubmit it to the plan using the plan’s rules.
  2. Contact the Part D plan if your claim is correct, and ask it to correct and resubmit its PDE.
  3. Keep the claim open in your refund tracking until the corrected refund arrives.
  4. Escalate through the manufacturer or program channels if the hold lasts well beyond normal timelines.

Codes that may appear with N911

  • CO-307 (Medicare Maximum Fair Price Standard Default Refund Amount Adjustment.): The standard default refund adjustment, held until PDE data is corrected.
  • N910 (A refund cannot be provided for this claim at this time.): A refund that cannot be provided for an unspecified eligibility reason.
  • N918 (No refund because CMS excludes prescription drug event records when a compound code indicates it is for a compounded drug.): The PDE record is excluded outright because it is for a compounded drug.
  • N909 (Refund amount has been calculated using a methodology that differs from the Standard Default Refund Amount calculation ((Wholesale Acquisition Cost…): A refund was calculated, but with a non-standard method.

N911 FAQ

What is prescription drug event data?

It is the record a Part D plan submits to CMS for each covered prescription fill. The Maximum Fair Price refund process relies on it to confirm the drug, quantity, and pricing.

Can the pharmacy fix the PDE?

No. The Part D plan submits PDE records. The pharmacy may need to correct and resubmit its pharmacy claim to the plan if the plan's data came from a pharmacy claim error.

Will the refund be paid automatically?

Generally, once the plan's corrected data passes validation, the refund can move forward. Keep tracking it in case it does not.