{
  "slug": "insurance-claim-denial",
  "question": "What are the odds of a major insurance claim being denied or severely underpaid?",
  "quick_answer": "There is no reliable figure: published denial rates are per-claim, not per-lifetime, and no source supports a cumulative chance of ever being denied. Denials are common on any given claim, yet almost no one appeals, so the insurer's initial decision usually sticks.\n",
  "category": "other",
  "no_reliable_estimate": true,
  "perceived": {
    "description": "Insurance claim denials occupy a peculiar place in public consciousness: everyone has heard a horror story, but most policyholders assume their own claims will be paid. The complexity of insurance contracts and the opacity of denial reasons contribute to a learned helplessness — denial rates are high, but because each individual encounters the system infrequently, the base rate remains poorly calibrated. Health insurance denials receive the most media attention, particularly after the 2024 UnitedHealthcare shooting brought insurer practices into national conversation, but denial rates for disability, long-term care, and property insurance are often higher and less visible.\n",
    "rough_estimate": "~15-20% of health claims denied",
    "kind": "intuition"
  },
  "native": {
    "display": "~19% of in-network health claims denied (ACA marketplace, 2024)",
    "numerator": 19,
    "denominator": 100,
    "unit": "share of in-network claims denied",
    "population": "ACA marketplace plan enrollees (HealthCare.gov, 2024)"
  },
  "sources": [
    {
      "url": "https://www.kff.org/patient-consumer-protections/claims-denials-and-appeals-in-aca-marketplace-plans-in-2024/",
      "title": "Claims Denials and Appeals in ACA Marketplace Plans in 2024",
      "publisher": "KFF (Kaiser Family Foundation)",
      "source_type": "primary_study",
      "statistic": "19% of in-network claims denied in 2024 (~85 million); 37% of out-of-network claims denied; less than 1% of denied claims appealed",
      "excerpt": "\"Of these in-network claims, approximately 85 million were ultimately denied, resulting in an average in-network denial rate of 19%. [...] Of the approximately 85 million in-network denied claims in 2024, HealthCare.gov consumers appealed at least 262,982 — an appeal rate of less than 1%.\"\n",
      "source_date": "2026-03-24",
      "source_accessed": "2026-04-24",
      "archive_url": "http://web.archive.org/web/20260519191142/https://www.kff.org/patient-consumer-protections/claims-denials-and-appeals-in-aca-marketplace-plans-in-2024/",
      "calculation_notes": "KFF's analysis of the CMS Transparency in Coverage Public Use File provides the most comprehensive data on ACA marketplace denial rates. The 19% in-network denial rate is the basis for the native estimate. The strikingly low appeal rate (<1%) suggests that the vast majority of denials go unchallenged, meaning the effective denial rate — denials that result in the policyholder bearing the cost — is very close to the raw denial rate. The 19% figure covers all claim types (administrative, medical necessity, prior auth); the subset of denials for medical necessity is roughly 5% of all denials.\n",
      "independence_note": "KFF's analysis uses CMS-mandated insurer transparency filings, independent from individual insurer self-reports and from the SSA's disability claims data.\n"
    },
    {
      "url": "https://www.urban.org/urban-wire/ssa-says-its-reduced-disability-claims-backlog-fewer-new-claims-and-higher-denial-rate",
      "title": "The SSA Says It's Reduced the Disability Claims Backlog. Fewer New Claims and a Higher Denial Rate Could Be Driving the Reduction",
      "publisher": "Urban Institute",
      "source_type": "primary_study",
      "statistic": "62% of SSDI claims denied at initial application in 2024; approval rate fell to 36% in FY2025",
      "excerpt": "\"The SSA's approval rate fell from 38.7 percent in fiscal year 2024 to an average of 36.0 percent in fiscal year 2025. While the number of approved claims remained flat at about 812,000 from 2024 to 2025, denials account for the entire increase in total decisions.\"\n",
      "source_date": "2025-09-12",
      "source_accessed": "2026-04-24",
      "archive_url": "http://web.archive.org/web/20260206150925/https://www.urban.org/urban-wire/ssa-says-its-reduced-disability-claims-backlog-fewer-new-claims-and-higher-denial-rate",
      "calculation_notes": "The SSDI initial denial rate of 62% represents one of the highest denial rates in any insurance-adjacent system. At reconsideration, 84% are denied again; at the ALJ hearing level, 51% are finally approved. The multi-stage process means that a claimant who persists through all appeals has roughly a 50% chance of eventual approval, but the process takes 1-3 years — during which the claimant has no disability income. This is included as a separate data point because disability insurance denial is a distinct and severe category of financial harm.\n",
      "independence_note": "The Urban Institute analysis uses SSA administrative data, independent from the KFF health insurance claims analysis which uses CMS marketplace data.\n"
    },
    {
      "url": "https://www.ajmc.com/view/how-insurance-claim-denials-harm-patients-health-finances",
      "title": "How Insurance Claim Denials Harm Patients' Health, Finances",
      "publisher": "American Journal of Managed Care",
      "source_type": "reputable_reference",
      "statistic": "Patients who experience claim denials report delayed care, medical debt, and reduced trust in the insurance system",
      "excerpt": "\"Insurance claim denials harm patients' health and finances, leading to delayed or foregone care, unexpected medical debt, and erosion of trust in the insurance system. The financial impact falls disproportionately on lower-income and chronically ill patients.\"\n",
      "source_date": "2025-01-15",
      "source_accessed": "2026-04-24",
      "archive_url": "http://web.archive.org/web/20260226180630/https://www.ajmc.com/view/how-insurance-claim-denials-harm-patients-health-finances",
      "calculation_notes": "AJMC provides qualitative context on the downstream effects of denials. While not a quantitative source for denial rates, it documents the mechanism by which denials translate into financial harm: patients who cannot afford to pay out-of-pocket either forgo care (creating future health costs) or incur medical debt. This supports the framing of denials as a financial risk, not merely an administrative inconvenience.\n"
    },
    {
      "url": "https://www.aha.org/news/headline/2024-10-17-senate-report-scrutinizes-medicare-advantage-prior-authorization-denials-post-acute-care-services",
      "title": "Senate report scrutinizes Medicare Advantage prior authorization denials for post-acute care services",
      "publisher": "American Hospital Association",
      "source_type": "reputable_reference",
      "statistic": "In 2022, UnitedHealthcare and CVS denied prior authorization for post-acute care at approximately three times their overall denial rates; Humana's post-acute denial rate was more than 16 times its overall rate (U.S. Senate Permanent Subcommittee on Investigations, 'Refusal of Recovery,' Oct 2024).",
      "excerpt": "\"In 2022, UHC and CVS denied prior authorization requests for post-acute care at approximately three times higher than the companies' overall denial rates, while Humana's prior authorization denial rate for post-acute care was more than 16 times higher than its overall denial rate.\"\n",
      "source_date": "2024-10-17",
      "source_accessed": "2026-06-14",
      "archive_url": "http://web.archive.org/web/20260214050332/https://www.aha.org/news/headline/2024-10-17-senate-report-scrutinizes-medicare-advantage-prior-authorization-denials-post-acute-care-services",
      "calculation_notes": "The American Hospital Association summarizes the U.S. Senate Permanent Subcommittee on Investigations Majority Staff Report \"Refusal of Recovery: How Medicare Advantage Insurers Have Denied Patients Access to Post-Acute Care\" (Oct 17, 2024), which analyzed over 280,000 internal documents from the three largest Medicare Advantage insurers (2019-2022). The ~3x post-acute figure for UnitedHealthcare and CVS is used as a personal_factor_multiplier: a policyholder whose claim is for post-acute care (skilled-nursing or inpatient-rehab after a hospital stay) under one of these plans faces roughly three times that insurer's own overall denial rate — a within-insurer ratio, not 3x this entry's 19% ACA in-network baseline. The Senate report attributes much of the elevation to AI/predictive systems that flag or auto-deny costly post-acute requests. The primary Senate PDF (hsgac.senate.gov) is bot-protected and returns 403 to automated fetch; this AHA summary carries the verbatim finding.\n",
      "independence_note": "The underlying Senate PSI investigation used insurer internal documents obtained under subpoena, independent from the CMS marketplace data (KFF) and the SSA disability data (Urban Institute) used by the other sources.\n"
    }
  ],
  "comparison_anchors": [
    {
      "label": "Student loan default (US borrowers)",
      "lifetime_us_adult": 0.26
    },
    {
      "label": "Retirement savings shortfall (US)",
      "lifetime_us_adult": 0.39
    },
    {
      "label": "Identity theft (lifetime, US adult)",
      "lifetime_us_adult": 0.6
    }
  ],
  "regional_breakdown": [
    {
      "region": "ACA marketplace, in-network claim",
      "probability": 0.19,
      "notes": "19% average per-claim in-network denial rate (KFF, 2024); ranges 3–36% by insurer. Per filed claim, not a lifetime probability."
    },
    {
      "region": "ACA marketplace, out-of-network claim",
      "probability": 0.37,
      "notes": "37% per-claim out-of-network denial rate (KFF, 2024). Per filed claim, not a lifetime probability."
    },
    {
      "region": "SSDI applicants (initial application)",
      "probability": 0.62,
      "notes": "62% initial denial rate for Social Security Disability Insurance (complement of the SSA's 38.7% FY2024 approval rate, Urban Institute). Per initial application."
    }
  ],
  "personal_factor_multipliers": [
    {
      "factor": "chronic condition requiring prior authorization",
      "multiplier": 2,
      "notes": "Prior authorization requirements increase the probability of denial for each encounter with the system"
    },
    {
      "factor": "employer-sponsored PPO plan",
      "multiplier": 0.5,
      "notes": "PPO plans with broad networks and fewer prior-auth requirements have lower denial rates"
    },
    {
      "factor": "out-of-network care",
      "multiplier": 2.5,
      "notes": "Out-of-network denial rates (37%) are roughly double in-network rates (19%)"
    },
    {
      "factor": "appeals all denials",
      "multiplier": 0.4,
      "notes": "Appealing denials reduces the effective denial rate substantially, but only <1% of consumers actually appeal"
    },
    {
      "factor": "post-acute care under Medicare Advantage",
      "multiplier": 3,
      "notes": "U.S. Senate Permanent Subcommittee on Investigations, \"Refusal of Recovery\" (Oct 2024): in 2022 UnitedHealthcare and CVS denied prior authorization for post-acute care (skilled-nursing and inpatient-rehab stays after a hospitalization) at approximately three times their overall denial rates; Humana's post-acute rate was over 16x its overall rate. Multiplier uses the ~3x figure for the two largest insurers.\n"
    }
  ],
  "short_label": "Insurance claim denial",
  "myth_framing": "underrated",
  "outcome_severity": "serious_harm",
  "exposure_pattern": "recurring",
  "outcome_type": "financial",
  "valence": "negative",
  "caveats": "We publish the source-stated per-claim denial rate (19% in-network, 37% out-of-network in the 2024 KFF ACA marketplace data) rather than a lifetime \"chance of ever being denied\" figure, because no source supports the latter. A prior version of this entry carried a ~70% lifetime estimate built from an assumed ~1% per-encounter \"major denial\" rate over ~118 lifetime claim encounters; both inputs were author assumptions with no published basis, so that figure has been withdrawn (no_reliable_estimate). Converting a per-claim rate into a lifetime probability would require an encounter count and a per-encounter severe-denial rate that no cited source provides. The 19% headline denial rate itself includes administrative denials (coding errors, duplicate submissions, missing information) alongside substantive denials (medical necessity, prior authorization). While some administrative denials can be corrected on resubmission, the &lt;1% appeal rate (about 263,000 out of 85 million denied claims) means most denials of all types go unchallenged. Denial rates vary enormously by insurer (3-36% in the KFF data), by plan type (marketplace vs. employer vs. Medicaid), and by clinical context. The SSDI denial rate is a fundamentally different system from commercial health insurance and is included here to illustrate the breadth of insurance-denial risk, not because the two systems are comparable. Among those who do appeal, overturn rates are substantially higher, suggesting that many denials would be reversed if challenged. A distinct and growing mechanism is algorithmic auto-denial: claims rejected at scale without individual clinician review. ProPublica (March 2023) reported that Cigna doctors denied over 300,000 payment requests in two months via its \"PXDX\" system, spending an average of 1.2 seconds per case; a class action alleges UnitedHealthcare's \"nH Predict\" post-acute-care model had a 90% error rate yet remained in use because only ~0.2% of denials are appealed. These error figures are litigation allegations, not adjudicated facts, and the AI-specific share of all denials has not been cleanly quantified — but the Senate Permanent Subcommittee on Investigations (Oct 2024) documented that the same predictive systems drove the elevated post-acute denial rates reflected in the multiplier above. Separately, this entry covers a filed claim being denied or underpaid; it does not capture the adjacent and rising risk of homeowners-policy non-renewal, climate-driven carrier exit, FAIR-plan forced placement, or outright uninsurability — events that occur before any claim. In exposed areas these have surged in 2024-2026 (Florida non-renewal rates roughly tripled between 2018 and 2023 per a 2024 U.S. Senate Budget Committee analysis), but a non-renewal is a different event class from a denied claim and is outside the per-claim denial rates reported here.\n",
  "quality_score": {
    "d1": 3,
    "d2": 5,
    "d3": 4,
    "d4": 3,
    "d5": 4,
    "d6": 5,
    "d7": 4,
    "d8": 5,
    "avg": 4.125,
    "scored_by": "extracted-from-transcript",
    "scored_at": "2026-05-03",
    "methodology_version": "1.0"
  },
  "reviewer": "8d-eval-2026-05-16",
  "last_reviewed": "2026-06-14",
  "reviewed": true,
  "generated_at": "2026-04-24",
  "image": {
    "alt": "A stamped 'DENIED' mark on a medical form, muted grey and red tones, flat vector illustration."
  },
  "attribution": "Likelier — https://likelier.app",
  "license": "https://creativecommons.org/licenses/by-sa/4.0/",
  "support": "https://buymeacoffee.com/kgluszczyk?via=likelier&utm_content=api-fear-single",
  "canonical_url": "https://likelier.app/insurance-claim-denial"
}