RARC N170: A new/revised/renewed certificate of medical necessity is needed.

A new/revised/renewed certificate of medical necessity is needed.

Common CARC pairings

RARC N170 appears with a Claim Adjustment Reason Code (CARC) on the 835 electronic remittance advice and gives more detail about the adjustment. These are the CARCs most often paired with RARC N170.

CARC	Meaning
50	These are non-covered services because this is not deemed a 'medical necessity' by the payer. Usage: Refer to the 835 Healthcare Policy Identification Segment (loop 2110 Service Payment Information REF), if present.
250	The attachment/other documentation that was received was the incorrect attachment/document. The expected attachment/document is still missing. At least one Remark Code must be provided (may be comprised of either the NCPDP Reject Reason Code, or Remittance Advice Remark Code that is not an ALERT).
251	The attachment/other documentation that was received was incomplete or deficient. The necessary information is still needed to process the claim. At least one Remark Code must be provided (may be comprised of either the NCPDP Reject Reason Code, or remittance Advice Remark Code that is not an ALERT).
252	An attachment/other documentation is required to adjudicate this claim/service. At least one Remark Code must be provided (may be comprised of either the NCPDP Reject Reason Code, or Remittance Advice Remark Code that is not an ALERT).
302	Precertification/notification/authorization/pre-treatment time limit has expired.