A prior authorization is your insurance company’s way of approving certain medical services or medications before you receive them. Your doctor’s office submits a request, the insurer reviews it, and you can’t move forward with the treatment until the insurer says yes. The whole process can take anywhere from 72 hours to 30 days depending on urgency, and it affects everything from specialty medications to elective surgeries and advanced imaging.
The Step-by-Step Process
Prior authorization starts with your doctor, not you. When your physician recommends a treatment, medication, or procedure that your insurance plan flags, their office submits a request to your insurer explaining why the service is medically necessary. This typically includes your diagnosis, relevant medical history, and documentation showing that the requested treatment is appropriate for your situation.
Your insurance company then reviews the request. In many cases, a nurse or medical reviewer on the insurer’s side evaluates the clinical information against the plan’s coverage criteria. If they need more details, they’ll go back to your doctor’s office and ask for additional records or test results, which can extend the timeline. Once they’ve made a decision, they send it in writing to both you and your doctor.
For standard requests, the process can take up to 30 days. If your doctor believes waiting that long could harm you, they can submit an urgent or expedited request, which gets a response within 72 business hours. A federal rule taking effect in 2026 will tighten these timelines further, requiring insurers to respond within 72 hours for urgent requests and within one week for non-urgent ones.
What Triggers a Prior Authorization
Not every doctor visit or prescription requires prior authorization. Insurers typically flag services that are expensive, prone to overuse, or where they want to confirm a cheaper alternative won’t work first. The specific list varies by plan, but common categories include:
- Specialty medications: Expensive drugs for chronic conditions, biologics, and certain injectable treatments like botulinum toxin (Botox)
- Elective and reconstructive surgeries: Procedures like eyelid surgery, rhinoplasty, excess skin removal, and cervical spine fusions
- Advanced imaging: MRIs, CT scans, and PET scans, particularly when ordered outside of emergency settings
- Implantable devices: Spinal cord stimulators and similar implanted technology
- Procedures with imaging guidance: Vein ablation therapy, facet joint injections, and similar interventional procedures
Your insurance card or plan documents won’t always spell out every service that needs prior authorization. Your doctor’s office typically knows which treatments get flagged based on experience with your insurer, and they’ll initiate the process before scheduling your care.
How Often Requests Get Denied
Most prior authorization requests go through. In 2024, Medicare Advantage insurers processed nearly 53 million prior authorization requests and fully or partially denied about 7.7% of them, totaling 4.1 million denials. That denial rate has hovered in a similar range for several years.
The more revealing number is what happens after a denial. Of the patients and providers who appealed a denied request in 2024, 80.7% had their denials partially or fully overturned. That means the vast majority of people who pushed back on a denial eventually got their care approved. The catch is that only a small fraction of people actually file an appeal, so many denials stand simply because no one challenges them.
What To Do if You’re Denied
If your prior authorization is denied, you have the right to appeal. The first step is an internal appeal, which goes back to your insurance company for a second review. These appeals must be submitted in writing, and insurers generally give themselves 30 days to review them. Your doctor can strengthen the appeal by providing additional clinical documentation explaining why the treatment is necessary and why alternatives aren’t appropriate.
If the internal appeal fails, you have options beyond your insurer. For HMO plans, a denial from your medical group can be escalated to the larger health plan, which has the authority to overrule the initial decision. For PPO plans, you can take the dispute to your state’s department of insurance or request an independent external review, where a third-party physician who has no relationship with your insurer evaluates the case. The external review decision is typically binding on the insurer.
Given the 80% overturn rate on appeals, filing one is almost always worth the effort if your doctor believes the treatment is medically necessary. Ask your doctor’s office to help with the paperwork, since they handle these regularly and know what documentation reviewers look for.
How Long an Approval Lasts
A prior authorization approval doesn’t last forever. Most approvals are valid for a set period, and if you don’t receive the service within that window, you’ll need to start over. The exact duration depends on your insurer and the type of service. For one-time procedures, approvals might last 60 to 90 days. For ongoing medications, the window varies widely. Some states and programs have pushed for longer approval periods: California’s Medicaid program, for example, now allows prior authorizations lasting up to five years for maintenance medications used to treat chronic conditions.
If you’re on a medication that requires prior authorization, keep track of when your approval expires. Your pharmacy will find out the hard way if it lapses, and you could face a gap in your medication while a new authorization is processed.
The Burden on Doctors and Patients
Prior authorization is one of the most time-consuming administrative tasks in healthcare. A 2024 American Medical Association survey found that physicians and their staff spend an average of 13 hours per week completing prior authorization paperwork. That’s more than a quarter of a standard work week devoted entirely to getting insurance approval for care that’s already been recommended.
The clinical consequences are real. In the same survey, 93% of physicians reported that prior authorization caused delays in patient care. These delays can range from a few days of waiting for a medication refill to weeks-long holds on surgeries or diagnostic tests. For time-sensitive conditions, those delays can change outcomes.
Federal regulators are trying to reduce this friction. A 2024 rule from the Centers for Medicare and Medicaid Services will require insurers to build electronic prior authorization systems by January 2027, replacing the current patchwork of fax machines, phone calls, and insurer-specific web portals. The goal is to make the process faster and more standardized. The AMA has pushed for even stricter timelines, calling for 48-hour turnarounds on non-urgent requests and 24 hours for urgent ones.
Prior Authorization vs. Similar Terms
You might see the terms “pre-certification,” “prior authorization,” and “predetermination” used in your insurance paperwork. Pre-certification and prior authorization mean the same thing: your insurer confirming that a service is medically necessary before you receive it. Predetermination is slightly different. It’s a benefit check where the insurer tells you in advance whether a service is covered and how much they’ll pay, but it’s not always a binding approval. If your plan mentions any of these, treat it as a signal that you need insurer sign-off before moving forward with care.