What Is CARC 50?
CARC 50 indicates the payer denied a claim because it determined the services were not medically necessary based on its medical-necessity policy, LCD, NCD, or commercial medical-policy criteria.
- Build a CARC 50 appeal template by payer that auto-pulls the LCD/NCD/medical-policy text and lets the appeal author insert documentation excerpts.
- Track CARC 50 reversal rates by payer; below 50% suggests under-investment in appeals or systemic coverage criteria misalignment.
CARC 50
Also known as: Denial Code 50; These services are non-covered services because this is not deemed a 'medical necessity' by the payer
CARC 50 indicates the payer denied a claim because it determined the services were not medically necessary based on its medical-necessity policy, LCD, NCD, or commercial medical-policy criteria.
Definition
CARC 50 is the standard X12 code for medical-necessity denials. For Medicare claims, CARC 50 typically reflects the MAC's LCD or CMS NCD criteria (covered diagnoses, frequency limits, documentation requirements) being unmet. For commercial claims, the payer's medical policy criteria apply. CARC 50 denials carry full appeal rights — Medicare provides redetermination, reconsideration, ALJ, Medicare Appeals Council, and federal court levels. Effective appeals typically include the relevant LCD/NCD/medical-policy citation, documentation supporting medical necessity, and clinical literature where the criteria are debatable.
Common Causes of CARC 50
- The diagnosis billed is not on the Medicare LCD/NCD list of covered indications, or fails the commercial payer's medical-policy criteria.
- Frequency limits or documentation requirements in the coverage policy were not met.
- Missing or incorrect ICD-10 diagnosis coding rather than a truly non-covered service.
How to Resolve CARC 50
- Identify the governing policy: the MAC's LCD, the CMS NCD, or the commercial payer's medical policy.
- Submit the correct diagnosis if it is documented (for example, G47.33 obstructive sleep apnea instead of G47.00 unspecified insomnia).
- File an appeal citing the LCD/NCD/medical-policy text, supporting documentation, and clinical literature where criteria are debatable (Medicare path: redetermination, reconsideration, ALJ, Appeals Council, federal court).
- Where no covered diagnosis applies, move the service to patient responsibility under a valid ABN.
How to Prevent CARC 50 Denials
- Build payer-specific CARC 50 appeal templates that auto-pull the relevant LCD/NCD/medical-policy text.
- Track CARC 50 reversal rates by payer; below roughly 50% signals under-investment in appeals or coverage-criteria misalignment.
Example
A patient receives a sleep study (CPT 95810) that returns CARC 50 because the patient's diagnosis (G47.00 unspecified insomnia) is not on the Medicare LCD's list of covered indications. The appeal would either submit the correct diagnosis if documented (e.g., G47.33 obstructive sleep apnea suspected) or document why an exception applies. Without a covered diagnosis, the service is patient-responsibility under an ABN.
Common Misconceptions
CARC 50 is not a 'no, never' denial — it is a coverage policy denial that often reflects missing or incorrect diagnosis coding rather than truly non-covered services. Many CARC 50 denials reverse on appeal with proper documentation and ICD-10 coding.
Practical Application
Build a CARC 50 appeal template by payer that auto-pulls the LCD/NCD/medical-policy text and lets the appeal author insert documentation excerpts. Track CARC 50 reversal rates by payer; below 50% suggests under-investment in appeals or systemic coverage criteria misalignment.
Related Terms
LCD / NCD (Local & National Coverage Determinations)
An NCD is a nationwide CMS coverage policy specifying whether Medicare will cover a service; an LCD is a coverage policy issued by a Medicare Administrative Contractor (MAC) for its jurisdiction when no NCD applies, defining medical necessity criteria and covered diagnosis codes.
Read definition arrow_forwardCARC
A Claim Adjustment Reason Code is a standardized code maintained by the X12 External Code List committee that explains why a claim line was adjusted (paid less than billed, denied, or transferred to patient responsibility) on a payer's 835 ERA.
Read definition arrow_forwardCARC 97
CARC 97 indicates the payer denied or reduced payment because the service is bundled with another service on the same claim under NCCI Procedure-to-Procedure edits — 'The benefit for this service is included in the payment/allowance for another service/procedure that has already been adjudicated.'
Read definition arrow_forwardCARC 197
CARC 197 indicates a denial because precertification, authorization, or notification required by the payer was not obtained before the service was rendered, often paired with RARCs identifying the specific authorization missing.
Read definition arrow_forwardWhere This Applies on MedPrecision
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