RARC M36: Missing or Incomplete Claim Information for This Service
The payer cannot process this service because the claim is missing information specific to the billed procedure — identify the required documentation or data elements and resubmit.
What Does RARC M36 Mean?
M36 indicates that the claim is lacking information that the payer needs to adjudicate the specific service being billed. Unlike broader missing-information codes, M36 tends to be service-specific — the payer knows what procedure you billed but needs additional context to process it. This could be supporting clinical documentation, a prior authorization number, operative notes for a surgical procedure, or a treatment plan for ongoing therapy services.
The service-specific nature of M36 means the required information varies widely depending on what was billed. For surgical claims, the payer may need an operative report to confirm the scope of the procedure. For therapy services, a plan of care or functional assessment may be required. For DME claims, a detailed written order or face-to-face encounter documentation might be the missing element. In many cases, M36 appears when the payer's claims processing rules require attachments or supplemental data that was not included with the initial submission.
M36 commonly pairs with CARC 16 (missing information), CARC 252 (additional information required), or CARC 50 (medical necessity). The accompanying CARC can help narrow down whether the missing information relates to basic claim data, clinical justification, or authorization requirements.
What to Do
Identify what additional information the payer requires for the specific service billed. Check the remittance for any supplemental messages that specify the missing element. If the remittance is not specific enough, contact the payer with the claim number to ask exactly what documentation or data fields are needed. Gather the required information — whether it is clinical notes, authorization references, or supporting documentation — and resubmit the claim with the missing elements included.
To reduce M36 denials going forward, review the payer's billing guidelines for the services your practice bills most frequently. Many payers publish documentation requirements by procedure category, and building these into your pre-submission checklist can catch missing elements before claims go out. For services that routinely require attachments, consider setting up your billing system to flag claims that lack the expected supporting documentation.
Common Scenarios
- A claim for an unlisted procedure code requires an operative report to justify the service, but the claim is submitted without the attachment and is returned with M36.
- A physical therapy claim is denied because the payer requires a current plan of care on file, and the most recent one expired before the dates of service on the claim.
- A DME claim for a power wheelchair requires a face-to-face encounter note from the prescribing physician, but the documentation was not submitted with the prior authorization request or the claim.
Commonly Paired With
No common pairings documented yet.