Prior authorization is the process by which a health insurer requires a physician to obtain approval before providing a prescribed treatment, medication, or procedure. In theory it is a clinical gatekeeping mechanism — a check on unnecessary or harmful care that protects patients and controls costs. In practice it is a delay and deterrence system that sits between a physician’s clinical judgment and a patient’s access to care, operated by an insurer whose financial interest runs in the direction of fewer approvals.
The distinction between theory and practice is not a matter of perspective. It is documented by physicians, by patient advocates, by state regulators, by federal investigators, and in the medical literature. The American Medical Association surveys its membership annually on prior authorization. In 2023, 94 percent of physicians reported that prior authorization had delayed necessary care for their patients. Thirty-three percent reported that a prior authorization delay or denial had led to a serious adverse event — hospitalization, permanent damage, or death — for a patient in their care. These are not marginal findings from a skewed sample. They are the documented experience of the physician workforce dealing with this system every day.
This article documents the prior authorization process from the patient’s side: how it works, what the evidence shows about its clinical effects, what named cases look like when the system fails, and what reform has looked like where it has been attempted.
How Prior Authorization Works
When a physician determines that a patient needs a specific treatment, medication, or procedure, the first question in a prior authorization system is not whether the care is appropriate — the physician has already made that determination. The question is whether the insurer agrees.
The physician or their staff submits a prior authorization request to the insurer, typically including clinical documentation supporting the medical necessity of the requested care. The insurer reviews the request against its coverage criteria — criteria that are set by the insurer, not by the physician’s medical society or by independent clinical bodies, and that may or may not align with current evidence-based guidelines. The insurer approves, denies, or requests additional information.
If the request is denied, the physician can appeal — a peer-to-peer review in which the treating physician speaks directly with the insurer’s reviewing clinician. If the peer-to-peer appeal fails, the patient can pursue an internal appeal and, if that fails, an external review. Each stage adds time. Time, in the context of a patient waiting for cancer treatment, cardiac care, or mental health services, is not a neutral variable.
The administrative burden this process imposes on physician practices is documented in The Administrative Burden and What It Costs. The patient’s experience — waiting, not knowing, navigating a bureaucratic process while managing an illness — is what this article addresses.
What the Evidence Shows
The AMA’s 2023 prior authorization survey is the largest and most consistent source of physician-reported data on prior authorization’s clinical effects. Its findings have been substantively consistent across multiple years of the survey:
- 94 percent of physicians reported prior authorization had delayed necessary care
- 33 percent reported a serious adverse event resulting from a prior authorization delay or denial
- 25 percent reported that prior authorization had led to a patient’s hospitalization
- 18 percent reported that prior authorization had led to a life-threatening event or required intervention to prevent permanent impairment
- 13 percent reported that a prior authorization issue had contributed to a patient’s disability
The survey also found that 89 percent of physicians reported that prior authorization had a negative impact on patient clinical outcomes, and that the average physician practice completes 43 prior authorization requests per physician per week — consuming approximately two business days of physician and staff time.
A 2022 study published in JAMA Network Open examined prior authorization in the Medicare Advantage context and found that one in five prior authorization denials reviewed by the HHS Office of Inspector General met Medicare coverage criteria — meaning the care was appropriate and should have been approved under the insurer’s own coverage rules. The OIG concluded that Medicare Advantage insurers were denying prior authorization requests that traditional Medicare would have covered, delaying or preventing beneficiaries from receiving medically necessary care.
Named Cases
The aggregate data describes a system. The named cases document what that system produces for individual patients.
Mailly Lara, a seventeen-year-old in Florida, was prescribed a medication for a rare autoimmune condition. Her insurer denied coverage, citing a formulary requirement to try a less expensive alternative first — a practice known as step therapy or “fail first.” Her physicians documented that the required alternative was clinically contraindicated for her specific condition. The insurer’s prior authorization process required multiple appeal cycles spanning several months before approval was obtained. Her case was documented by patient advocacy organizations as an example of step therapy protocols applied without clinical flexibility.
Alexus Ochoa, a California teenager with a rare form of cancer, was denied proton beam radiation therapy by her insurer in 2019. Her oncologists at Loma Linda University Medical Center — one of the country’s leading proton therapy centers — determined the treatment was medically necessary to reduce radiation exposure to surrounding tissue. The insurer denied the prior authorization request, determining the treatment was experimental. Her family appealed; the denial was upheld through multiple internal appeal stages. A state external review ultimately overturned the denial, but the process consumed weeks during which treatment was delayed. Her case drew significant media attention and was cited in California legislative testimony on prior authorization reform.
Paul Cannon, a Tennessee man with a blood clot, was prescribed anticoagulation medication by his physician. His insurer required prior authorization and then denied the request, citing formulary step therapy requirements. His physician submitted an urgent appeal. The insurer did not respond within the timeframe its own policies required. Cannon was hospitalized with a pulmonary embolism while the appeal was pending. His case was subsequently cited in federal legislative testimony on prior authorization reform timelines.
These cases are representative of a documented pattern, not exceptional outliers. The medical literature, patient advocacy documentation, and state regulatory records contain thousands of similar cases across every insurance market and every category of care.
Prior Authorization and Mental Health Care
Prior authorization requirements are applied to mental health and substance use disorder services at rates that research consistently finds disproportionate to their application in medical and surgical care — a disparity that constitutes a parity violation under the Mental Health Parity and Addiction Equity Act in documented cases but that has been difficult to enforce systematically.
A 2022 analysis by the Mental Health Treatment Access Coalition found that prior authorization was required for outpatient mental health visits at significantly higher rates than for equivalent medical visits in the same plans. Inpatient psychiatric care and residential substance use disorder treatment face particularly intensive prior authorization scrutiny — with concurrent review requirements that allow insurers to authorize care in short increments and deny continuation before a clinical episode is complete.
The practical effect is that patients in acute mental health crises face administrative barriers to care that patients experiencing equivalent medical emergencies do not face. The full treatment of the parity enforcement gap — including the regulatory history and the documented enforcement failures — is in the Mental Health and Addiction hub. The prior authorization dimension is one of the primary mechanisms through which parity violations occur in practice.
What Reform Has Looked Like
The prior authorization system has attracted more legislative and regulatory attention in recent years than at any previous point — driven by consistent physician advocacy, patient organization documentation, and the cases that have reached public attention.
At the federal level, the Improving Seniors’ Timely Access to Care Act — which would have imposed prior authorization reform requirements on Medicare Advantage plans — passed the House of Representatives in 2022 with bipartisan support but did not pass the Senate. CMS subsequently implemented some prior authorization reforms for Medicare Advantage through rulemaking, including requirements for electronic prior authorization systems, maximum response timeframes for urgent requests, and continuity of care protections when patients switch plans.
At the state level, more than thirty states have enacted some form of prior authorization reform legislation as of 2024. Common provisions include gold-carding — exempting physicians with high approval rates from prior authorization requirements for specific services — maximum response timeframes, automatic approval for requests not decided within required windows, and step therapy override protections requiring insurers to accommodate physician judgments about clinically contraindicated alternatives.
The insurance industry has consistently opposed legislation that would constrain prior authorization practices, arguing that prior authorization prevents unnecessary care and reduces costs. The AMA’s documentation of physician experience, the OIG’s findings on Medicare Advantage denials, and the named case record collectively constitute the evidence against that argument.
What a Patient Can Do
Prior authorization is navigable, though it should not have to be. The following applies to patients facing a denial:
Request a peer-to-peer review. Your physician can request direct communication with the insurer’s reviewing clinician. Peer-to-peer reviews reverse denials at higher rates than written appeals alone. Ask your physician’s office to initiate one immediately.
File an internal appeal. Every insurer must have an internal appeal process. Request the denial in writing — you are entitled to it — and file an appeal with clinical documentation from your physician supporting medical necessity. Timelines matter: urgent appeals must be decided within 72 hours under federal law; standard appeals within 30 days.
Request external review. If your internal appeal fails, you are entitled to external review by an independent organization whose decision is binding on the insurer for fully insured plans. Your insurer must provide information on how to request external review in its denial letters.
Contact your state insurance commissioner. If the insurer is not meeting required response timeframes or is not following its own appeals procedures, your state insurance commissioner can investigate. Most commissioners have consumer complaint processes accessible online.
Document everything. Keep records of every communication — dates, names of people spoken to, documents submitted and received. That documentation is essential if the case reaches external review or, in egregious cases, litigation.
Health Insurance Hub
00 — Hub: Health Insurance Industry
01 — How the Health Insurance Industry Works — and Who It Works For
02 — How Health Insurers Make Money
03 — Designed to Discourage: How Benefit Structures Reduce Claims
04 — The Denial System: How Insurers Decide What Not to Pay
05 — Prior Authorization: What Patients Experience
06 — The Administrative Burden and What It Costs
07 — Narrow Networks and What They Cost You
08 — The Employer-Sponsored Insurance Trap
09 — The Broker and Consultant Layer
10 — Billed for Diseases They Never Treated: How Medicare Advantage Fraud Works
11 — What Single-Payer Resolves: The Evidence From This Hub
12 — Health Care Forum: Join the conversation here
This article was researched and drafted with AI assistance under human review. See our full AI and editorial practices.