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N485 Remark Code: Physical Therapy Certification Missing

N485 means the payer did not receive a required physical therapy certification, typically the physician's or qualified practitioner's signed approval of the therapy plan of care. The therapy services are denied or held until the certification is supplied.

Quick facts

Code
N485 (RARC N485)
Status
Active In use since July 1, 2008.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): The therapy provider is responsible for obtaining and supplying the certification, so the amount is generally not billable to the patient.
Official description
Missing Physical Therapy Certification.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N485 means

Many payers will not pay for outpatient physical therapy until a physician or other qualified practitioner has reviewed and signed the therapist’s plan of care. That signature is the certification. It confirms the practitioner agrees the patient needs the therapy described, at the frequency and duration proposed.

N485 appears when the payer looks for that certification and cannot find it. It usually rides with CARC 252 or CARC 16 at the line level for the therapy services.

Common causes

  • The plan of care was sent to the practitioner but never returned signed.
  • The signed certification exists in the chart but was not attached or submitted when the payer required it.
  • Treatment continued past the certified period and no recertification was obtained.
  • The payer needed the certification uploaded to its portal before claims, and that step was skipped.

How to fix it

  1. Check the chart for a signed and dated certification that covers the dates of service on the claim.
  2. If it exists, submit it as the payer directs and ask for the claim to be reprocessed.
  3. If it is missing, send the plan of care to the practitioner for signature. Ask the payer whether it accepts a delayed certification and what explanation it wants.
  4. Refile or appeal. Use a corrected claim (resubmission code 7 in box 22) if the payer wants one, or its reconsideration process if the claim was finalized.
  5. Review the other therapy claims for the same patient, since the same gap probably affects every visit in that period.

How to prevent it

Track each patient’s certification period in the scheduling or billing system and alert staff before visits fall outside it. Hold claims when the certification is not back yet, and follow up with the practitioner’s office on a set schedule. The authorization prevention guide covers similar front-end controls.

Codes that may appear with N485

  • CO-252 (An attachment/other documentation is required to adjudicate this claim/service.): An attachment is required; the missing item is the physical therapy certification.
  • CO-16 (Claim/service lacks information or has submission/billing error(s).): The claim lacked information required for adjudication.
  • CO-272 (Coverage/program guidelines were not met.): Program guidelines, such as plan-of-care certification rules, were not met.
  • N486 (Incomplete/invalid Physical Therapy Certification.): A certification was received but was incomplete or invalid.
  • N238 (Incomplete/invalid physician certified plan of care.): The physician-certified plan of care is incomplete or invalid.
  • N465 (Missing Physical Therapy Notes/Report.): Missing physical therapy notes or report, a different document from the certification.
  • N473 (Missing certification.): A generic missing-certification remark that does not name the type.

N485 FAQ

Who signs a physical therapy certification?

Usually the patient's physician or another practitioner the payer allows, such as a nurse practitioner or physician assistant. Requirements depend on the payer and, for some plans, state law.

Is a referral the same as a certification?

Not necessarily. A referral or order sends the patient to therapy. A certification is the practitioner's signed approval of the therapist's plan of care. Some payers require both.

Can a late signature fix N485?

Some payers, including Medicare, allow delayed certification with documentation explaining the delay. Others do not. Check the payer's policy before resubmitting.