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CARC Code

CARC 198 Denial Appeal

Authorization exceeded (sessions beyond the approved limit)

Precertification/notification/authorization/pre-treatment exceeded.

Why CARC 198 hits behavioral-health claims

Payers manage outpatient psychotherapy (90832/90834/90837), IOP, and ABA through batch authorizations — approving, say, 8–12 sessions at a time and requiring concurrent review to continue. Sessions delivered while reauthorization is pending, units miscounted against the auth, or an authorization that lapses mid-episode all post as CARC 198. Comparable medical office visits are rarely subjected to visit-by-visit authorization at all, which is itself a parity red flag: visit limits are quantitative treatment limitations and prior-authorization/concurrent review is a non-quantitative treatment limitation under MHPAEA.

The winning argument

The denied sessions are the continuation of an already-authorized, medically necessary course of treatment. When a plan has approved an ongoing course of treatment for a set number of visits, cutting coverage off mid-course is an adverse benefit determination on a concurrent-care claim: for ERISA-governed plans, 29 CFR 2560.503-1(f)(2)(ii) requires notice sufficiently in advance of any reduction or termination to allow the claimant to appeal and obtain a determination before benefits stop. An 'authorization exceeded' adjustment that silently terminates an approved course of psychotherapy does not satisfy that standard.

  • Visit limits are quantitative treatment limitations and prior-authorization/concurrent review is a non-quantitative treatment limitation; under MHPAEA, both must be no more restrictive — and applied no more stringently — to mental health benefits than to comparable medical/surgical benefits in the same classification.
  • If a valid authorization in fact covered the denied dates or units (a renewal was issued, or the auth number was omitted or misapplied on the claim), the denial is an administrative error and the claim should be reprocessed against the correct authorization.
  • The claimant is entitled, upon request and free of charge, to copies of all documents, records, and other information relevant to the determination — including the utilization-review/concurrent-review records and the criteria used to refuse continued authorization (29 CFR 2560.503-1(h)(2)(iii)).
  • Where reauthorization was delayed or the lapse was outside the provider's control, retroactive authorization of the interim sessions is warranted given documented medical necessity and the clinical risk of interrupting an active course of treatment; payers routinely accept appeals of 198 denials with supporting documentation.

Sample appeal letter body

Replace the {{placeholders}} with your own information before sending.

We are appealing the denial of psychotherapy services for {{patient_reference}}, denied under CARC 198 (precertification/notification/authorization/pre-treatment exceeded). The sessions at issue ({{cpt_code}}, dates of service {{dates_of_service}}) are part of an ongoing, previously authorized course of treatment: authorization {{authorization_number}} approved {{authorized_session_count}} sessions, and the clinical record documents that continued treatment remains medically necessary — {{clinical_justification_summary}}. Where a plan has approved an ongoing course of treatment for a specified number of visits, any reduction or termination of that course before its end constitutes an adverse benefit determination, and the plan must provide notice sufficiently in advance to allow an appeal to be decided before benefits are reduced or terminated (29 C.F.R. § 2560.503-1(f)(2)(ii)); in this case, {{advance_notice_status}}. We further note that visit limits and authorization-based medical management applied to outpatient mental health services must be no more restrictive, and applied no more stringently, than those applied to comparable medical/surgical benefits under the Mental Health Parity and Addiction Equity Act. We therefore request authorization of the sessions at issue and reprocessing of this claim, and we request, under 29 C.F.R. § 2560.503-1(h)(2)(iii), free copies of all documents, records, and criteria relied upon in this determination, including the concurrent-review records and the authorization history on file.

You'll need to supply: patient_reference (member ID / claim # — fill locally), cpt_code (e.g., 90834, 90837, 90791), dates_of_service (the denied sessions), authorization_number (the prior authorization on file), authorized_session_count (sessions/units originally approved), clinical_justification_summary (1–2 sentences: symptoms, functional impairment, risk if treatment is interrupted), advance_notice_status (e.g., 'no advance written notice of reduction or termination was received')

What this argument cannot ground

Honest gaps — no fabricated sources.

  • CARC 198 usually posts with group code CO (contractual obligation): under most network contracts the amount is a provider write-off and generally cannot be billed to the patient.
  • Before appealing, verify the authorization history — a large share of 198 denials are administrative (renewal issued but not linked, auth number omitted, units miscounted) and resolve faster via a corrected claim or payer call than a formal appeal.
  • If no authorization for the additional sessions was ever requested and the plan's authorization requirement is clear, this is often a contractual adjustment with low appeal odds; the realistic path is a retro-authorization request supported by clinical documentation.
  • The 29 CFR 2560.503-1 concurrent-care argument applies to ERISA-governed group health plans; it does not apply to Medicare, Medicaid fee-for-service, or other non-ERISA coverage (some states have analogous utilization-review notice rules).
  • MHPAEA does not cover all plans (e.g., Medicare, retiree-only plans, certain opt-out self-funded non-federal governmental plans), and the parity argument is strongest when the plan does not impose comparable visit-by-visit authorization on medical/surgical outpatient care — verify before asserting.
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