Behavioral Health Denial and Prior Authorization Statistics: What the Data Actually Shows
The current published numbers on prior authorization and claim denials — Medicare Advantage determinations and overturn rates, ACA marketplace denial rates and reasons, and GAO's behavioral health findings — with the caveats each figure needs.
On this page: Direct answer
Direct answer
Behavioral health denial statistics: what operators need to know
The current published numbers on prior authorization and claim denials — Medicare Advantage determinations and overturn rates, ACA marketplace denial rates and reasons, and GAO's behavioral health findings — with the caveats each figure needs. Medicare Advantage 2024: ~53 million prior-authorization determinations; 7.7% denied in whole or part (KFF analysis of CMS data).
Denial statistics are widely quoted and routinely misused: prior-authorization denial rates, claim denial rates, and appeal overturn rates come from different programs with different denominators, and behavioral-health-specific rates are mostly not published at all. This page collects the current, citable figures from federal data and independent analyses — each with its source and its limits — so operational arguments can rest on numbers that survive scrutiny.
Three findings matter most for behavioral health operations. In Medicare Advantage, KFF's analysis of CMS data found insurers made nearly 53 million prior-authorization determinations in 2024, denied 7.7% of requests in whole or part, and — critically — only 11.5% of denials were appealed while 80.7% of appeals were partially or fully overturned. In ACA marketplace plans, insurers denied 19% of in-network claims in 2024, with under 1% of denials appealed. And GAO found that nearly all reviewed Medicare Advantage organizations required prior authorization for behavioral health services, most applying internal coverage criteria to inpatient behavioral health decisions. The consistent picture: denials are common, appeals are rare, and appeals succeed.
Key takeaways
The short version
- Medicare Advantage 2024: ~53 million prior-authorization determinations; 7.7% denied in whole or part (KFF analysis of CMS data).
- Appeals are rare but effective: 11.5% of MA denials were appealed, and 80.7% of appeals were overturned at least in part.
- ACA marketplace 2024: 19% of in-network claims denied, ranging from 3% to 36% by insurer; under 1% of denials were appealed.
- Denial reasons are mostly non-clinical: only 5% of marketplace in-network denials cited medical necessity.
- Behavioral-health-specific denial rates are largely unpublished — use your own tagged case data for payer-level truth.
1. Medicare Advantage prior authorization (2024 data)
The appeal-rate gap is the operational headline: if four in five appealed denials are overturned but barely one in nine denials is appealed, the unclaimed recovery sits with providers who stop at the denial. GAO's behavioral health review adds the service-level context — eight of nine MA organizations it examined required prior authorization for behavioral health services, concentrated in inpatient and specialized care, and seven applied internal coverage criteria to those inpatient decisions.
| Measure | Figure | Source and note |
|---|---|---|
| Determinations | Nearly 53 million | KFF analysis of CMS MA data, 2024 |
| Denied in whole or part | 4.1 million requests — 7.7% | KFF; denial shares vary widely by insurer |
| Insurer variation | Roughly 4.2% to 12.8% across large insurers | KFF; illustrates why payer-level tracking beats national averages |
| Denials appealed | 11.5% | KFF; most denials are never contested |
| Appeals overturned | 80.7% partially or fully | KFF; overturn rates have been high across multiple years |
2. ACA marketplace claim denials (2024 data)
| Measure | Figure | Source and note |
|---|---|---|
| In-network claims denied | 19% | KFF analysis of HealthCare.gov insurer transparency data, 2024 |
| Out-of-network claims denied | 37% | KFF; combined average about 20% |
| Insurer range | 3% to 36% in-network | KFF; state and insurer variation is large |
| Denials appealed | Under 1% | KFF; roughly 263,000 appeals against ~85 million denied in-network claims |
| Appeal outcomes | 66% upheld by insurers | KFF; about a third of appealed denials were reversed |
| Stated reasons | 36% "other"; 25% administrative; 9% prior authorization or referral; 5% medical necessity | KFF; most denials are not clinical determinations |
3. What exists — and does not — for behavioral health specifically
- GAO's review is the clearest federal evidence that behavioral health carries concentrated prior-authorization requirements in Medicare Advantage, especially inpatient levels of care
- Physician surveys — including the AMA's — consistently report authorization-related care delays and abandonment, which behavioral health teams experience as no-shows and interrupted episodes
- Payer-published transparency data mostly does not break out behavioral health denial rates; the CMS-0057-F metrics and 2026 MA criteria submissions may improve visibility over time
- The practical substitute is your own ledger: denial and overturn rates tagged by payer, service, and reason code — which is also the only dataset that reflects your contracts and documentation
- Treat any vendor-published "behavioral health denial rate" without a stated source and denominator as marketing, not measurement
4. Using these numbers without misusing them
- Business cases: pair the national overturn rates with your own appeal capacity to size the recovery you are not pursuing
- Payer meetings: national figures set context, but your payer-level tagged outcomes carry the argument
- Board and budget conversations: the 25% administrative-reason share supports investing in process before clinical staffing
- Citations: quote the figure with its source, year, program, and denominator — the credibility of a statistics argument dies on the first misquoted number
- Recency: these figures reflect sources current as of the review date on this page; the underlying analyses update annually, and the current publication controls
Common questions
Answers before you build.
What percentage of prior authorization requests are denied?+
In Medicare Advantage, KFF's analysis of CMS data found 7.7% of prior-authorization requests were denied in whole or part in 2024, with large variation by insurer. Comparable comprehensive figures for commercial plans are not published; behavioral-health-specific denial rates are largely unpublished in any program.
How often are denial appeals successful?+
In Medicare Advantage in 2024, 80.7% of appealed prior-authorization denials were partially or fully overturned, per KFF's analysis — yet only 11.5% of denials were appealed. In ACA marketplace plans, insurers upheld about two-thirds of the rare appeals filed, reversing roughly a third.
Why are most claims denied?+
Mostly for non-clinical reasons. Among 2024 marketplace in-network denials, insurers attributed only 5% to medical necessity; a quarter cited administrative reasons, 9% cited missing prior authorization or referral, and the largest single category was unspecified "other." Process failures — not clinical disputes — dominate the denial queue.
Are behavioral health claims denied more often than medical claims?+
Comprehensive published rates comparing behavioral and medical denial rates do not really exist. What is documented: GAO found behavioral health services face concentrated prior-authorization requirements in Medicare Advantage, and behavioral health teams report high administrative burden. For payer-level truth, tag and measure your own denials by service and reason.
Practical closeout
Use this operator checklist.
- Medicare Advantage 2024: ~53 million prior-authorization determinations; 7.7% denied in whole or part (KFF analysis of CMS data).
- Appeals are rare but effective: 11.5% of MA denials were appealed, and 80.7% of appeals were overturned at least in part.
- ACA marketplace 2024: 19% of in-network claims denied, ranging from 3% to 36% by insurer; under 1% of denials were appealed.
- Denial reasons are mostly non-clinical: only 5% of marketplace in-network denials cited medical necessity.
- Behavioral-health-specific denial rates are largely unpublished — use your own tagged case data for payer-level truth.
Continue through the cluster
Verified customer case studies are added only with customer permission and supporting evidence; none is implied by these operational examples.
Sources & methodology
Trace the operational claims.
Marsa Health Editorial reviewed the primary and research sources below on July 28, 2026. We translate them into workflow controls, distinguish proposals from final rules, and flag where plan, program, state, contract, or clinical requirements vary.
- 01Medicare Advantage prior authorization determinations in 2024 KFFAnalysis of CMS data on Medicare Advantage prior authorization denials and appeals.Accessed or rechecked July 28, 2026
- 02Claims denials and appeals in ACA Marketplace plans in 2024 KFFAnalysis of claim denials and appeals. Claim denials are not the same as prior authorization denials.Accessed or rechecked July 28, 2026
- 03Medicare Advantage: CMS Oversight of Prior Authorization Criteria Should Target Behavioral Health Services (GAO-25-107342) U.S. Government Accountability OfficeGAO findings on MA organizations' use of prior authorization and internal coverage criteria for behavioral health, and CMS's planned 2026 criteria reviews and data submissions.Accessed or rechecked July 28, 2026
- 042024 AMA prior authorization physician survey American Medical AssociationPhysician-reported administrative workload, delays, treatment abandonment, and burnout associated with prior authorization.Accessed or rechecked July 28, 2026
- 05Insurers Pledge to Improve Prior Authorization American Medical Association (Fix Prior Auth)AMA tracking of the insurer pledge and physician-survey data on whether pledged reductions are observable in practice.Accessed or rechecked July 28, 2026
- 06CMS Interoperability and Prior Authorization Final Rule CMS-0057-F Centers for Medicare & Medicaid ServicesCurrent implementation dates, decision timeframes, denial-reason requirements, metrics, and API provisions for impacted payers.Accessed or rechecked July 28, 2026
- 07Electronic Prior Authorization Centers for Medicare & Medicaid ServicesCurrent CMS provider-readiness guidance for 2027 electronic prior authorization, EHR questions, FHIR testing, and workflow preparation.Accessed or rechecked July 28, 2026
- 08Minimum Necessary Requirement U.S. Department of Health and Human ServicesHIPAA guidance on limiting uses, disclosures, and requests for protected health information when the standard applies.Accessed or rechecked July 28, 2026
Organizational author. Editorial review covers source accuracy, search intent, workflow boundaries, and human-oversight requirements. This material is educational and does not provide clinical, legal, coding, or coverage advice.
No named clinical or legal expert reviewer is attributed to this version. Marsa Health does not invent reviewer credentials.
Read our editorial methodRevision history
What changed and when
July 28, 2026
Initial publication, source review, and operational editing.