CARC 204 Denial Appeal
Not covered under current benefit plan
This service/equipment/drug is not covered under the patient's current benefit plan.
Why CARC 204 hits behavioral-health claims
BH interventions (IOP, TMS, ABA, psychological testing) are common targets of broad policy carve-outs in employer plans, while equivalent medical/surgical rehabilitative services are covered as standard benefits.
The winning argument
Excluding a specific, medically necessary behavioral-health service while covering analogous medical/surgical interventions is a discriminatory NQTL under federal parity law; a state mandate or medical-exception pathway may also require coverage.
- The service may be a state-mandated benefit overriding the plan exclusion.
- The treatment was erroneously classified as experimental despite an evidence base.
- A medical exception applies where covered alternatives have failed.
Public sources you can cite
Every argument traces to a verified public source — no invented citations.
X12 — Claim Adjustment Reason Codes (official)
Supports: Official wording of CARC 204
American Psychiatric Association — Parity
Supports: Challenging sweeping BH benefit exclusions as parity NQTLs
CMS — Mental Health Parity & Addiction Equity Act
Supports: Federal MHPAEA framework applied to benefit-design exclusions
Sample appeal letter body
Replace the {{placeholders}} with your own information before sending.
We are appealing the denial of {{service_name}} for {{patient_reference}} under CARC 204 (not covered under the current benefit plan). While the plan cites an exclusion, {{service_name}} is the evidence-based standard-of-care for {{patient_diagnosis}}, recognized by {{clinical_guideline_source}}. Denying this behavioral-health intervention while covering analogous medical/surgical rehabilitative care operates as a discriminatory non-quantitative treatment limitation under the Mental Health Parity and Addiction Equity Act. {{state_law_if_applicable}} Based on the attached clinical documentation showing that covered alternatives have failed, we request a medical exception and coverage.You'll need to supply: service_name, patient_reference, patient_diagnosis, clinical_guideline_source, state_law_if_applicable (optional)
What this argument cannot ground
Honest gaps — no fabricated sources.
- Payers do not publish 'this exclusion violates parity' statements; the NQTL linkage rests on the general MHPAEA framework (CMS/APA).
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