Prior Authorization — and How to Win a Denial Appeal

Prior authorizationPrior AuthorizationPrior authorization is a requirement from your health plan that the provider get approval before performing certain services, or the claim won't be paid. It's used to enforce medical necessity criteria on higher-cost ite… Read the full definition → (PA) is the process by which your insurer decides whether to approve a service, procedure, or medication before it's provided. If PA is denied, the service isn't covered, and you either pay cash or don't get the care. In theory, PA exists to prevent medically unnecessary treatment. In practice, it's frequently a coverage-denial tool that even the AMA has publicly criticized as excessive.

The most important thing to know: most PA denials are reversible. KFF's 2023 analysis of Medicare Advantage plans found that 82% of appealed PA denials were overturned. And most patients — 90%+ — never appeal, so the initial denial stands. This is one of the highest-ROI patient-advocacy interventions available.

1. What Prior Authorization Is

Before covering certain services, most insurers require documentation from your provider showing:

• The specific diagnosis (ICD-10 codeICD-10ICD-10 is the diagnosis coding system used on every medical claim. Where CPTCPT CodeCPT stands for Current Procedural Terminology. It's the five-digit code system, maintained by the American Medical Association, that identifies every medical procedure and service billable to insurance. Every line on a m… Read the full definition → codes describe what the provider did, ICD-10 codes describe why — the condition, symptom, or reason for the visit. The current version, ICD-10-… Read the full definition →)
• Why this service is medically necessaryMedical NecessityMedical necessity is the standard a health plan uses to decide whether a service is covered. Generally, a service is medically necessary if it's consistent with the diagnosis, meets accepted medical practice standards, i… Read the full definition →
• Whether less-expensive alternatives have been tried and failed
• How the service aligns with the insurer's medical policy for this condition

The insurer reviews this documentation, applies its medical policy criteria, and either approves, denies, or requests more information. Turnaround varies by service urgency:

• Standard non-urgent: up to 15 days for commercial plans, 14 days for Medicare Advantage
• Urgent/expedited: 72 hours (federal ACA requirement)
• Emergency care: PA cannot be required

2. Common Services and Drugs Requiring PA

• High-cost imaging: MRI, CT, PET
• Surgery: most inpatient and complex outpatient procedures
• Specialty medications: biologics (Humira, Enbrel, Dupixent), cancer treatments, hepatitis C drugs, PCSK9 inhibitors, most drugs above $500/month
• Mental health inpatient: psychiatric admissions and residential treatment
• Physical therapy: often after 6-8 visits
• Durable medical equipment: CPAP, wheelchairs, insulin pumps
• Genetic testing
• Fertility services

What generally does not require PA: primary care visits, routine labs, generic drugs, preventive servicesPreventive CarePreventive care is a defined list of services that ACA-qualified health plans must cover at 100 percent, with no deductibleDeductibleA deductible is the dollar amount you pay out of pocket for covered services each plan year before your health plan starts sharing the cost. If your deductible is $3,000, you pay the first $3,000 of allowed charges yours… Read the full definition →, copayCopayA copay is a flat dollar amount you pay for a specific service, usually collected at the time of care. A $30 primary care copay, a $75 specialist copay, a $10 generic drug copay. It's the simplest form of cost-sharing — … Read the full definition →, or coinsuranceCoinsuranceCoinsurance is the percentage of the allowed amount you pay after your deductible is met, up until you hit your out-of-pocket maximum. If your plan is "80/20 after deductible," the plan pays 80% and you pay 20% of every … Read the full definition →, when delivered in-networkIn-NetworkIn-network means a provider or facility has a written contract with your health plan's network. That contract locks in a negotiated rate, requires the provider to accept the allowed amount as payment in full, and prohibi… Read the full definition →. The list is set by the US Preventive Services… Read the full definition →, emergency care.

3. Denial Rates and Reversal Rates

The data is striking:

• AMA 2023 survey: physicians reported that on average 15% of PA requests are denied. For high-cost drugs, denial rates climb to 30%+.
• KFF 2023 (Medicare Advantage): 46 million PA requests in 2021; 6.0% denied; 11% of denials were appealed; 82% of appeals were overturned.
• ProPublica investigation 2023: Cigna PA denials had a physician-reviewer average of 1.2 seconds per case in some categories. The insurer denied thousands of claims without meaningful medical review.

Translation: initial denials are frequently wrong, and appeal wins the majority of the time. But the process requires effort, so most patients don't bother.

4. Peer-to-Peer Review: The Most Powerful Tool

The single most effective intervention in a PA denial is the peer-to-peer review. This is a phone call between your treating physician and a medical director at the insurer to discuss the case.

Why it works: the medical director is a physician (usually), and physician- to-physician conversation about specific medical necessity gets past the generic policy-checklist logic of standard PA review. The medical director can override the initial denial on the spot.

Reversal rates on peer-to-peer are typically 40-60% depending on specialty and drug class. It's the highest-yield first appeal step.

How to request: after a denial, your physician's office calls the insurer's PA line and specifically asks for a peer-to-peer review. The call is usually scheduled within 24-48 hours. The physician makes the medical case directly. Most decisions come at the end of the call.

5. The Formal Appeal Process

If peer-to-peer doesn't succeed (or your physician doesn't request one), you file a formal appeal:

First-level internal appeal

You (or your physician) submit written documentation to the insurer arguing why the denial should be reversed. The insurer must respond within specified timelines (30 days standard, 72 hours urgent). Most insurers require this to happen within 180 days of the denial.

Second-level internal appeal

If the first appeal fails, most plans allow a second-level appeal, reviewed by a different medical director than the first. Same documentation, sometimes with additional evidence.

External independent review

If internal appeals fail, you have the right (under ACA) to an external reviewExternal ReviewExternal review is the appeal step that comes after a health plan's internal appeals process has been exhausted — an independent third-party reviewer (an Independent Review Organization, or IROIndependent Review Organization (IRO)An Independent Review Organization (IRO) is an accredited third-party entity that conducts external appeal reviews of health plan denials. IROs employ or contract with physician reviewers in relevant specialties who exam… Read the full definition →) examines the denial and i… Read the full definition → by an independent physician not employed by the insurer. This review is binding on the insurer. External review reversal rates run 40-70% depending on state and diagnosis category.

Every state has one or more approved Independent Review Organizations (IROs). Your denial letter must include instructions for requesting external review. Federal timelines: 60 days to request after final internal denial, 45 days for the IRO decision (72 hours for urgent).

6. The Appeal Letter That Works

An effective appeal letter has five components:

1. Clear identification. Member name, DOB, member ID, claim number, date of service, provider name.
2. Denial reason quote. Cite the exact language from the denial letter you're appealing.
3. Medical necessity argument. Written by or with your physician. References specific clinical guidelines (AHA, ACS, USPSTF, AAOS, etc.). Explains why the service is required for your specific case, not in general.
4. Evidence. Peer-reviewed literature, clinical guidelines, FDA labels for medications, your medical history documentation.
5. Requested remedy. Specifically ask the insurer to overturn the denial and authorize the service. Include the CPT/HCPCS code and provider information.

Template opening:

"I am writing to formally appeal the denial of prior authorization for [service] (CPT [code]) issued by [insurer] on [date], reference number [X]. The denial letter cited [specific reason]. I request reversal of this denial for the reasons set forth below."

Template medical necessity paragraph (with physician input):

"[Patient name] was diagnosed with [condition] on [date] following [diagnostic workup]. Per [treatment guideline], the standard of care for this presentation is [service]. Alternative treatments including [list] have been considered and are inappropriate because [clinical reasoning]. The proposed service is supported by [citation to peer-reviewed evidence or clinical guideline]."

7. The Cures Act Gold-Carding Provision

The 21st Century Cures Act21st Century Cures ActThe 21st Century Cures Act is federal legislation enacted in December 2016 that mandated significant changes in medical research funding, drug approval timelines, mental health system reform, and — most consequentially f… Read the full definition → (2016) and subsequent CMS rulemaking created frameworks for "gold-carding" — insurers granting simplified PA processes to providers with historically high approval rates. Some Medicare Advantage plans now waive PA for gold-carded providers on certain services.

Practical implication: if your provider is gold-carded with your insurer, PA becomes a formality. Ask your physician's office whether they're gold-carded with your plan.

8. Timelines You Should Know

• Insurer PA decision: 15 days standard, 72 hours urgent
• Time to request internal appeal: 180 days from denial
• Internal appeal decision: 30 days standard, 72 hours urgent
• Time to request external review: 60 days from final internal denial
• External review decision: 45 days standard, 72 hours urgent
• Total possible timeline (denial through external review): ~7-8 months worst case

9. What to Do If You Need Care Immediately

If you need care but PA is being denied and appealed:

1. Request expedited reviewExpedited ReviewAn expedited review is an accelerated appeal process available when a health plan's standard review timeframes would jeopardize the patient's health or ability to function. The plan is required to complete the review — a… Read the full definition → — if delay would cause serious harm, insurers must decide in 72 hours.
2. Ask your physician to file a "continuity of careContinuity of CareContinuity of care is the legal and contractual protection that lets a patient continue to see their current provider — even after that provider leaves the network — for a limited time during an active course of treatmen… Read the full definition →" request — if you're in active treatment, some insurers grant temporary approval while the appeal proceeds.
3. Consider paying cash for the immediate service — retain receipts and seek reimbursement if the appeal wins.
4. Escalate to your state insurance commissioner — for urgent situations, the commissioner's office can pressure the insurer to decide quickly.

10. The Broker's Playbook

1. Confirm PA is required before scheduling the service. Your provider's office should verify with the insurer.
2. If PA is denied, immediately request peer-to-peer review. This is the fastest and highest-yield step.
3. If peer-to-peer fails, file first-level internal appeal within 30 days (well ahead of the 180-day deadline).
4. If first-level appeal fails, file second-level appeal AND simultaneously prepare for external review.
5. Do not accept a denial as final. Most denials are wrong. Persistent appeal wins most of the time.

11. Physician Burden: Why This Matters Beyond Denials

PA burden on physicians is substantial. The AMA's 2023 physician survey found that practices spend an average of 14 hours per week per physician processing prior authorizations. 33% of physicians report that PA has led to a serious adverse event for a patient in their practice. 24% report PA has led to a patient's hospitalization.

Practical implication for patients: your physician's office is overwhelmed with PA requests, and errors happen. Don't assume the PA process is running correctly in the background. If you're prescribed something that typically requires PA, follow up within 3-5 business days to confirm the request was submitted and to check status. Being your own advocate accelerates the process.

12. State and Federal Reform Landscape

PA reform is a live policy issue. Recent developments:

• CMS Interoperability and Prior Authorization Final Rule (2024). Requires Medicare Advantage, Medicaid, and ACA marketplaceACA MarketplaceThe ACA Marketplace (also called the Health Insurance Marketplace, the Exchange, or by state-specific names like Covered California and Access Health CT) is the federal or state-run online platform where individuals and … Read the full definition → plans to shorten standard PA timelines to 7 days (from 14) and provide specific denial reasons by 2026. Also requires electronic PA APIs by 2027.
• State-level laws. Texas SB-1275, Illinois HB-711, and multiple other state laws have added PA reforms including turnaround timelines, transparency requirements, and gold-carding provisions.
• Federal legislation. The Improving Seniors' Timely Access to Care Act has passed the House multiple times but stalled in the Senate. Would apply similar reforms to Medicare Advantage.

The direction is clear: PA is becoming more transparent, faster, and more appealable. But policy changes lag actual patient experience by years, so knowing the current appeal mechanics remains critical.

Prior authorization was designed to control unnecessary utilization. It has become, in many cases, a friction mechanism to delay or discourage legitimate care. The system's saving grace is the appeal process — which works, more often than not, when patients actually use it.