CARC 151 Denial Appeal
Frequency not supported
Payment adjusted because the payer deems the information submitted does not support this many/frequency of services.
Why CARC 151 hits behavioral-health claims
BH patients often need multiple sessions per week (eating disorders, acute trauma, severe depression); payers apply arbitrary frequency hard-caps or Medically Unlikely Edits to therapy/crisis codes.
The winning argument
The frequency of service was medically necessary due to acute clinical severity, and applying an arbitrary frequency cap to behavioral-health codes without individualized clinical review — more restrictively than for comparable medical/surgical E&M codes — is an NQTL under MHPAEA.
- Multiple sessions addressed distinct, separate clinical exacerbations.
- The frequency prevented a higher, costlier level of care (ER/inpatient).
Public sources you can cite
Every argument traces to a verified public source — no invented citations.
Sample appeal letter body
Replace the {{placeholders}} with your own information before sending.
We are appealing the CARC 151 denial regarding the frequency of {{cpt_code}} provided to {{patient_reference}} on {{dates_of_service}}. The patient presented with an acute exacerbation of {{patient_diagnosis}}, characterized by {{acute_symptoms}}. To stabilize the patient and prevent a higher level of care, {{number_of_sessions_or_units}} were clinically necessary. Limiting the frequency of specialized behavioral-health interventions via automated edits, without individualized clinical review and more strictly than comparable medical/surgical services, operates as a non-quantitative treatment limitation under the Mental Health Parity and Addiction Equity Act. Attached progress notes detail the acute symptomatology that required this frequency.You'll need to supply: cpt_code, patient_reference, dates_of_service, patient_diagnosis, acute_symptoms, number_of_sessions_or_units
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