CARC 55 denial code: meaning & whether to appeal (verified)
What CARC 55 means
Procedure/treatment/drug is deemed experimental/investigational by the payer.
Verbatim description from the official X12 Claim Adjustment Reason Codes list.
Classification
Denial class: medical necessity
Appealability verdict
Appealable — medical necessity
What to know
The strongest appeals cite the payer's own published medical policy and show, element by element, where the clinical record satisfies it. Plan documentation requirements before appealing.