Health-insurance appeal guides

How the appeals process actually works — federal deadlines, what insurers must do, expedited review, and when to escalate.

• How to appeal a denied health insurance claimThe end-to-end playbook for fighting a health-insurance denial in the United States — what the categories mean, what evidence you need, how the timeline works, and when to bring in help.
• Internal appeal vs. external review: which one do you need?After a denial you generally have two layers of appeal. Internal appeal is the insurer reviewing its own decision; external review is an independent organization. Here's how they differ and when each applies.
• How long does an insurance appeal take? The real timelineFederal deadlines insurers must hit on internal appeals (30/60/72), the week-by-week calendar of a standard post-service appeal, expedited 72-hour rule, and the second 60-day external-review clock.
• I missed my insurance appeal deadline — what now?Options after missing the 180-day federal floor — calculating how late you are, good-cause exceptions, procedural defects in the original notice, state insurance department complaints, and the narrow paths to external review without internal exhaustion.
• Expedited insurance appeals: when and how to request oneThe 72-hour expedited internal appeal — clinical situations that qualify (ongoing inpatient, scheduled surgery, urgent medication, end-of-life), how to phrase the written request, and how to file expedited external review in parallel.
• What happens after you submit an insurance appealWhat goes on inside the insurer after you file — acknowledgment timing, the claims rep → nurse → medical director → peer review pipeline, what reviewers actually look at, common stalls, follow-up strategy, and what to do when the clock runs out.

How to write the appeal — structure, phrasing, provider letters, and what evidence actually moves a denial.

• Medical necessity denials: what evidence winsWhen your insurer says a service wasn't medically necessary, you're being asked to prove a clinical case. The strongest appeals in this category combine a treating-provider letter, peer-reviewed support, and a plan-language anchor.
• Insurance appeal letter: a working templateThe six required sections of a strong appeal letter (plus optional sections worth considering), with the skeleton you can adapt to any denial category.
• Magic words and phrases that strengthen an appealA catalog of phrases worth knowing, why each one works procedurally, and when it actually applies — including the phrases to avoid.
• How to get your doctor to write a strong support letterSix elements of a strong provider letter, the records to request before you ask, a working phone script, and a fallback plan if the office is slow.
• Writing the medical necessity argumentThe prong-by-prong attack on a medical-necessity denial using the NAIC three-prong definition, plan-language anchoring, and ACA appeal-rights framing.
• Insurance appeal letter examples — what works by denial typeHow appeal emphasis shifts across the five core denial categories — what to highlight, what evidence helps, and which CARC codes you are likely to see.

Strategy by denial type — medical necessity, prior authorization, plan exclusion, out-of-network, and more.

• Medical necessity denials: what evidence winsWhen your insurer says a service wasn't medically necessary, you're being asked to prove a clinical case. The strongest appeals in this category combine a treating-provider letter, peer-reviewed support, and a plan-language anchor.
• Writing the medical necessity argumentThe prong-by-prong attack on a medical-necessity denial using the NAIC three-prong definition, plan-language anchoring, and ACA appeal-rights framing.
• Insurance appeal letter examples — what works by denial typeHow appeal emphasis shifts across the five core denial categories — what to highlight, what evidence helps, and which CARC codes you are likely to see.
• MRI denied by insurance — the full appeal guideHow to use the ACR Appropriateness Criteria, clinical history (symptom duration, exam findings, prior workup), and the plan's medical-necessity language to win an MRI appeal.
• Bariatric surgery denied — your appeal optionsA criterion-by-criterion walkthrough of bariatric appeals — BMI thresholds, 6-month supervised programs, co-morbidities, psych eval, sleeve vs. bypass, and plan exclusions.
• TMS denied — the appeal blueprint for treatment-resistant depressionThe chart-level documentation that makes TMS appeals win: drug-class diversity, therapeutic doses, adequate trial durations, PHQ-9 thresholds, and FDA/APA citations.

Appeal blueprints for specific treatments — imaging, surgery, fertility, behavioral health, specialty drugs.

• Why your Ozempic, Wegovy, or Mounjaro claim got denied — and how to appealGLP-1 medication denials are the most common specialty-drug appeal we see. The denial reasons cluster around a handful of patterns; the appeal evidence is usually similar.
• MRI denied by insurance — the full appeal guideHow to use the ACR Appropriateness Criteria, clinical history (symptom duration, exam findings, prior workup), and the plan's medical-necessity language to win an MRI appeal.
• Bariatric surgery denied — your appeal optionsA criterion-by-criterion walkthrough of bariatric appeals — BMI thresholds, 6-month supervised programs, co-morbidities, psych eval, sleeve vs. bypass, and plan exclusions.
• IVF and fertility denial appeals — what your state allowsHow state IVF mandates (NJ, NY, IL, MA, RI, CT, CO and others) interact with ERISA preemption for self-funded plans, plus the clinical evidence that wins fertility appeals.
• Mental health therapy denied — using the Parity ActIdentifying parity violations (session caps, prior-auth disparity, NQTLs, network adequacy) in therapy denials and invoking MHPAEA plus the 2024 final-rule comparative-analysis requirement.
• TMS denied — the appeal blueprint for treatment-resistant depressionThe chart-level documentation that makes TMS appeals win: drug-class diversity, therapeutic doses, adequate trial durations, PHQ-9 thresholds, and FDA/APA citations.

How appeals work at each of the major US insurers — UnitedHealthcare, Aetna, Cigna, BCBS, Kaiser, and more.

• Aetna denial appeals: the process that actually worksWalks through Aetna's publicly-published Clinical Policy Bulletins, internal utilization-review flow (nurse → medical director), denial-letter language to decode, and the IRO external review path.
• UnitedHealthcare denied my claim — full playbookDecodes UHC's appeal levels, the role of Optum/OptumRx/Optum Behavioral Health in clinical review, the peer-to-peer-review option, and Provider Portal vs member appeals path.
• Cigna denial appeals explainedExplains Cigna's centralized appeals unit, Evernorth/Express Scripts/Accredo involvement on pharmacy denials, and how to dismantle a medical-necessity denial by quoting Cigna's own SPD definition.
• BCBS denial appeals: navigating the state federationUntangles BCBS as a 33-member federation; how to identify your specific plan from the EOB header and ID alpha prefix; BlueCard out-of-state routing; when to escalate to state DOI.
• Kaiser Permanente denials — navigating an integrated planCovers why Kaiser's integrated payer-provider model makes internal appeals structurally limited and positions California's DMHC Independent Medical Review (IMR) as the strongest external path.

The federal and state rules that govern health-insurance appeals — ACA, ERISA, Mental Health Parity, No Surprises Act.

• IVF and fertility denial appeals — what your state allowsHow state IVF mandates (NJ, NY, IL, MA, RI, CT, CO and others) interact with ERISA preemption for self-funded plans, plus the clinical evidence that wins fertility appeals.
• Mental health therapy denied — using the Parity ActIdentifying parity violations (session caps, prior-auth disparity, NQTLs, network adequacy) in therapy denials and invoking MHPAEA plus the 2024 final-rule comparative-analysis requirement.
• Mental Health Parity Act: using it in your appealMHPAEA and the 2020 CAA require parity; this guide shows how to identify a parity violation in a denial (session caps, MH-only prior-auth, narrower medical-necessity rules, network gaps) and how to frame it in an internal appeal or state DOI / DOL complaint.
• ERISA appeals: when federal law governs your planERISA governs most employer health plans: 29 CFR 2560.503-1 timelines, 'full and fair review,' self-funded vs fully-insured distinction, HHS federal external review path, and the practical implications for the appeal letter.
• No Surprises Act: what it covers and what it doesn'tFederal protections for emergency services, OON ancillary at in-network facilities, and air ambulance; the IDR back-end; notice-and-consent waiver risks; ground-ambulance gap; how to invoke the Act in an OON appeal.
• ACA appeal rights — the federal floorThe 45 CFR 147.136 floor — 180 days to file, 30/60/72-hour decision windows, full and fair review, binding external review — and which plans (grandfathered, short-term, fixed-indemnity) it does not reach.

Reading your EOB, understanding denial codes, knowing your plan type — the things every consumer should know.

• How to appeal a denied health insurance claimThe end-to-end playbook for fighting a health-insurance denial in the United States — what the categories mean, what evidence you need, how the timeline works, and when to bring in help.
• What is an EOB? How to read your Explanation of BenefitsYour Explanation of Benefits is the document that tells you what your insurer paid, what you owe, and — when something is denied — why. A field-by-field guide.