Prior authorization is a requirement from your health insurance company that your doctor get approval before providing a specific treatment, medication, or procedure. Your insurer reviews the request to decide whether the service is medically necessary and covered under your plan before you receive it. If your doctor skips this step when it’s required, your insurance can refuse to pay, leaving you with the full bill.
Why Insurers Require It
The core purpose is cost control. Insurance companies use prior authorization to steer patients toward less expensive options when they exist and to prevent services the insurer considers unnecessary. That plays out in a few specific ways.
When your doctor prescribes a brand-name drug, your insurer may require prior authorization to push toward a cheaper generic alternative. If you need a procedure done at a hospital, the insurer may use prior authorization to direct you to a facility it has a payment contract with, which costs the plan less. And for treatments that carry significant risks or costs, the insurer reviews the request against evidence-based clinical guidelines to confirm the treatment is appropriate given your diagnosis.
The Step-by-Step Process
Prior authorization starts with your doctor, not with you. When your physician prescribes a medication, orders imaging, or recommends a procedure that your plan flags for review, the doctor’s office submits a request to your insurance company. That request includes your diagnosis, the proposed treatment, and clinical documentation explaining why it’s needed.
The insurer then reviews the submission. A clinical reviewer on the insurance side compares the request against the plan’s coverage criteria and medical guidelines. They may approve it outright, request additional documentation, or deny it. If more records are needed, your doctor’s office gathers and resubmits them, which can add days or weeks to the process.
You’ll typically find out about the decision through your doctor’s office, though many insurers also send written notices directly to patients. If the request is approved, treatment moves forward. If it’s denied, you and your doctor have the option to appeal.
How Long It Takes
Response times depend on whether the request is classified as standard or urgent. Under federal rules finalized by the Centers for Medicare and Medicaid Services, insurers in Medicare Advantage, Medicaid, and marketplace plans must respond to standard requests for non-drug services within seven calendar days. Expedited requests, for situations where a delay could seriously harm your health, must be answered within 72 hours. Drug-related prior authorizations have even tighter windows: 24 hours for urgent requests.
Those are maximums. In practice, electronic prior authorization systems have compressed timelines significantly. A 2021 study from America’s Health Insurance Plans found that the median time from submission to decision dropped 69%, from 18.7 hours to 5.7 hours, after electronic systems were adopted. About 62% of electronic requests now receive a decision within two hours, and 43% are processed automatically without any manual review.
Still, these faster times apply mainly to straightforward requests. Complex cases that require additional documentation or peer-to-peer conversations between your doctor and the insurer’s reviewer can stretch well beyond these averages.
The Burden on Doctors and Patients
Prior authorization is one of the biggest administrative headaches in American healthcare. A 2024 American Medical Association survey found that physician practices complete an average of 39 prior authorizations per physician per week. That volume pulls time and staff away from direct patient care.
The consequences go beyond paperwork. In that same survey, 93% of physicians reported that prior authorization causes care delays, and 94% said it has a negative impact on patient outcomes. More than one in four physicians said prior authorization has led to a serious adverse event for a patient in their care, such as a hospitalization or worsening condition caused by a treatment delay. And 82% reported that the process can lead patients to abandon treatment altogether, either because they give up waiting or because an alternative the insurer approves feels like a lesser option.
What Happens if You’re Denied
A denial isn’t the end of the road. The appeals process has two main stages, and the odds of overturning a denial are better than many people assume.
Internal Appeal
Your first step is an internal appeal, which your insurance company is legally required to offer. A different set of medical professionals at the insurer, not the ones who made the original denial, review your case fresh. You generally have 180 days from the denial date to file this appeal. The insurer must respond within 72 hours for urgent care situations, 30 days for future planned services, and 60 days for services you’ve already received.
Your doctor plays a key role here. Ask them to submit a letter of medical necessity and any supporting clinical evidence that strengthens your case. Many insurers also offer a second-level internal appeal if the first one fails, giving you one more shot before moving to an outside review.
External Review
If internal appeals don’t work, you can request an external review. This sends your case to independent medical experts who have no connection to your insurance company. External review is available for denials based on medical necessity, experimental or investigational treatments, level of care disputes, and certain coverage decisions.
You typically have 120 days after your final internal appeal denial to request external review. Standard cases are decided within 45 days, while urgent cases get a ruling within 72 hours. The key difference at this stage: if the independent reviewer rules in your favor, the decision is binding. Your insurer must approve the prior authorization and cover the service.
New Rules Taking Effect
Federal regulations finalized in 2024 are reshaping how prior authorization works. Starting in 2026, insurers covering Medicare Advantage, Medicaid, and marketplace plans must provide a specific reason when they deny a prior authorization request, rather than a vague or generic explanation. They’re also required to publicly report their prior authorization approval rates, denial rates, and appeal outcomes on their websites, giving patients and doctors visibility into how often a plan actually approves requests.
By 2027, these same insurers must implement electronic prior authorization systems that connect directly with doctors’ electronic health records. This means your doctor’s office will be able to submit requests, check status, and receive decisions within the same system they use for your medical records, rather than navigating fax machines and phone trees.
Gold Carding for High-Approval Doctors
Some states have passed “gold carding” laws that exempt doctors from prior authorization requirements if they have consistently high approval rates, typically above 90%. Under these programs, a physician who almost always gets prior authorizations approved is given a yearlong pass, meaning their patients can receive care without the delay of insurer review. The idea is straightforward: if a doctor’s clinical judgment aligns with the insurer’s criteria the vast majority of the time, requiring them to submit paperwork for every case wastes everyone’s time.
How to Protect Yourself
Before any scheduled procedure, imaging study, or new prescription, ask your doctor’s office whether prior authorization is required and whether it’s been submitted. Don’t assume it’s been handled. If your doctor’s office says the authorization is “pending,” get a timeline and follow up. Delays often happen not because the insurer is slow, but because requested documentation hasn’t been sent.
Keep copies of all denial letters and correspondence. If you’re denied, ask your doctor whether they recommend appealing and whether they’ll support the appeal with additional documentation. Many denials are overturned, particularly when the appeal includes a detailed letter from your physician explaining why the specific treatment is necessary for your specific situation, not just medically reasonable in general.
If your employer offers multiple insurance plans during open enrollment, compare their prior authorization lists. Plans vary widely in which services require prior authorization, and choosing a plan with fewer requirements for the treatments you regularly need can save significant frustration over the course of a year.