Guides

Plain-English explanations of how health-insurance appeals work, written and reviewed by our editorial team.

Browse by topic

Appeals process & timelinesAppeal letters & evidenceDenial categoriesProcedure & treatment guidesInsurer-specific guidesYour legal rightsFundamentals

All guides

How to appeal a denied health insurance claim

The 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.

Published May 14, 2026PILLAR

What is an EOB? How to read your Explanation of Benefits

Your 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.

Published May 14, 2026PILLAR

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.

Published May 14, 2026PILLAR

Why your Ozempic, Wegovy, or Mounjaro claim got denied — and how to appeal

GLP-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.

Published May 14, 2026PILLAR

Medical necessity denials: what evidence wins

When 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.

Published May 14, 2026PILLAR

How long does an insurance appeal take? The real timeline

Federal 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.

Published May 14, 2026

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.

Published May 14, 2026

Expedited insurance appeals: when and how to request one

The 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.

Published May 14, 2026

What happens after you submit an insurance appeal

What 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.

Published May 14, 2026

When to escalate to external review — and when to stop

Decision tree after an internal denial — when external review is your strongest move (medical necessity, experimental, clinical-judgment prior auth), when it isn't (clear plan exclusions, eligibility, pure billing), state vs federal external review systems, and when to stop appealing.

Published May 14, 2026

Insurance appeal letter: a working template

The six required sections of a strong appeal letter (plus optional sections worth considering), with the skeleton you can adapt to any denial category.

Published May 14, 2026

Magic words and phrases that strengthen an appeal

A catalog of phrases worth knowing, why each one works procedurally, and when it actually applies — including the phrases to avoid.

Published May 14, 2026

How to get your doctor to write a strong support letter

Six 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.

Published May 14, 2026

Writing the medical necessity argument

The prong-by-prong attack on a medical-necessity denial using the NAIC three-prong definition, plan-language anchoring, and ACA appeal-rights framing.

Published May 14, 2026

Insurance appeal letter examples — what works by denial type

How appeal emphasis shifts across the five core denial categories — what to highlight, what evidence helps, and which CARC codes you are likely to see.

Published May 14, 2026

MRI denied by insurance — the full appeal guide

How 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.

Published May 14, 2026

Bariatric surgery denied — your appeal options

A criterion-by-criterion walkthrough of bariatric appeals — BMI thresholds, 6-month supervised programs, co-morbidities, psych eval, sleeve vs. bypass, and plan exclusions.

Published May 14, 2026

IVF and fertility denial appeals — what your state allows

How 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.

Published May 14, 2026

Mental health therapy denied — using the Parity Act

Identifying parity violations (session caps, prior-auth disparity, NQTLs, network adequacy) in therapy denials and invoking MHPAEA plus the 2024 final-rule comparative-analysis requirement.

Published May 14, 2026

TMS denied — the appeal blueprint for treatment-resistant depression

The chart-level documentation that makes TMS appeals win: drug-class diversity, therapeutic doses, adequate trial durations, PHQ-9 thresholds, and FDA/APA citations.

Published May 14, 2026

Aetna denial appeals: the process that actually works

Walks 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.

Published May 14, 2026

UnitedHealthcare denied my claim — full playbook

Decodes 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.

Published May 14, 2026

Cigna denial appeals explained

Explains 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.

Published May 14, 2026

BCBS denial appeals: navigating the state federation

Untangles 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.

Published May 14, 2026

Kaiser Permanente denials — navigating an integrated plan

Covers 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.

Published May 14, 2026

Mental Health Parity Act: using it in your appeal

MHPAEA 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.

Published May 14, 2026

ERISA appeals: when federal law governs your plan

ERISA 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.

Published May 14, 2026

No Surprises Act: what it covers and what it doesn't

Federal 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.

Published May 14, 2026

ACA appeal rights — the federal floor

The 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.

Published May 14, 2026

Can I sue my insurance company for denying my claim?

Honest framing: the administrative ladder (internal → external → DOI/DOL → court), ERISA preemption, bad-faith law's narrowness, and when retaining counsel actually makes sense ($$, ongoing care, pattern denials).

Published May 14, 2026