CARC 50
Not medically necessary, per the payer
The payer's policy does not accept the service as necessary for the diagnosis reported.
Why you actually get this
- The documentation does not establish what the payer's coverage policy requires.
- A supporting diagnosis in the chart was omitted from the claim.
- The service genuinely falls outside the payer's published criteria.
How to check whether it’s correct
- 01Find the payer's coverage policy for this service and read what it requires.
- 02Re-read the note against that policy — the gap is usually documentation, not clinical judgement.
- 03Check whether a supporting diagnosis was left off the claim.
Usually worth appealing
Rarely a clinical disagreement. It is almost always that the documentation submitted did not establish what the policy requires, and the note that does is already in the chart. Practices lose this money by not going back for the record rather than by having been wrong.
Often arrives with
Seeing a lot of these?
A single denial is a claim to work. A pattern of the same denial is a process to fix, and the two need completely different responses. A free panel reads ninety days of your claims data and shows which codes actually recur for you.
Claim Adjustment Reason Codes are maintained by X12 as External Code List 139. The official description of this code is theirs and is not reproduced here. Check the authoritative list for current wording and status.