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CARC Code

CARC 39 Denial Appeal

Authorization was requested and denied

Services denied at the time authorization/pre-certification was requested.

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Why CARC 39 hits behavioral-health claims

Payers gate the highest-acuity behavioral-health services behind prior authorization — IOP, PHP, residential treatment, ABA, psychological/neuropsych testing, TMS — and many still require pre-certification for extended or continued psychotherapy (e.g., 90837 or sessions beyond an initial allotment). Utilization reviewers applying proprietary level-of-care criteria frequently deny these requests at intake or concurrent review; when the clinician continues treating because stopping mid-episode is clinically unsafe, the claim returns CARC 39. Because pre-authorization is itself a non-quantitative treatment limitation under MHPAEA, behavioral-health practices encounter this denial pattern disproportionately, and the underlying authorization denial is often based on medical-necessity judgments made without behavioral-health expertise.

The winning argument

The authorization denial underlying this claim was an adverse benefit determination that must receive a full and fair review on appeal — including a free copy of the specific internal rule, guideline, protocol, or clinical criteria relied upon and, because the determination rests on medical judgment, review by a health care professional with appropriate training and experience in behavioral health (29 C.F.R. § 2560.503-1). Where the plan's prior-authorization process is applied more stringently to mental-health services than to comparable medical/surgical services, it also operates as an impermissible non-quantitative treatment limitation under MHPAEA.

  • The clinical record submitted with (or supplementing) the authorization request demonstrates that the requested service met the plan's own coverage criteria at the time of the request; the appeal record now includes that documentation in full.
  • Pre-authorization is expressly identified by CMS as a non-quantitative treatment limitation, and under the CAA, 2021 the plan must perform, document, and make available a comparative analysis showing its prior-authorization standards for MH/SUD benefits are comparable to and applied no more stringently than those for medical/surgical benefits — we request that analysis.
  • If the internal appeal is denied, the patient has the right to an independent external review, and urgent cases must be expedited.
  • Suspected parity violations in how the authorization was handled can be escalated to the state insurance commissioner, the U.S. Department of Labor (self-funded plans), or HHS, using established complaint pathways.

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 denial of behavioral health services for {{patient_reference}}, denied under CARC 39 (services denied at the time authorization/pre-certification was requested). The denial of the authorization request submitted on {{auth_request_date}} was an adverse benefit determination, and we are exercising the right to a full and fair review of that determination together with this claim. The requested {{service_description}} met the plan's own coverage criteria at the time of the request: the clinical record documents {{clinical_justification}}, and interrupting or delaying treatment would have created {{risk_if_delayed}}. We formally request a free copy of the specific internal rule, guideline, protocol, or clinical criteria relied upon in denying authorization, and review of this appeal in consultation with a health care professional with appropriate training and experience in behavioral health, consistent with 29 C.F.R. § 2560.503-1 for plans subject to ERISA. Because pre-authorization is a non-quantitative treatment limitation under the Mental Health Parity and Addiction Equity Act, we also request the plan's comparative analysis demonstrating that its prior-authorization standards, as written and in operation, are no more restrictive for mental-health services than for comparable medical/surgical services. Should this appeal be denied, the patient retains the right to an independent external review.

You'll need to supply: patient_reference (member ID / claim # — fill locally), auth_request_date (date the authorization/pre-certification request was submitted), service_description (service and CPT/HCPCS code, e.g., IOP, 90837, psychological testing), clinical_justification (symptoms, severity, and functional impairment supporting the requested level of care), risk_if_delayed (clinical risk of interrupting or delaying care, e.g., decompensation, relapse, safety risk)

What this argument cannot ground

Honest gaps — no fabricated sources.

  • CARC 39 means the payer denied the authorization request itself — it is distinct from CARC 197 (no precertification obtained). The appeal must attack the underlying utilization-review denial; pull the original authorization denial letter and its stated reason before drafting.
  • If services were rendered after a known authorization denial without timely appealing that pre-service determination, the plan's appeal window may have lapsed and the contract may shift liability to provider or patient — verify the plan's appeal deadlines first.
  • The 29 C.F.R. § 2560.503-1 rights apply to ERISA-governed employer plans; individual/marketplace, Medicaid MCO, and Medicare Advantage plans have analogous but different appeal procedures — adjust the regulatory framing to the plan type.
  • The MHPAEA comparative-analysis demand applies to plans offering both med/surg and MH/SUD benefits; confirm plan type before invoking parity.
  • If the original authorization denial was administrative (non-covered benefit category, wrong payer, eligibility), the medical-judgment and parity arguments do not fit — this letter targets denials based on medical necessity / level of care.
Argument confidence72%

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