A prior authorization is a requirement from your health insurance company to approve a specific medication before it will be covered under your plan. Your doctor prescribes the drug, but instead of heading straight to the pharmacy, your doctor’s office first has to submit documentation to your insurer proving the medication is medically necessary. Until that approval comes through, you either wait or pay full price out of pocket.
The process exists because insurers want to verify that a prescribed drug is appropriate for your condition, that cheaper alternatives aren’t available, and that the medication won’t interact dangerously with something else you’re taking. In practice, it adds a layer of delay between you and your prescription that can range from a few days to several weeks.
Why Insurers Require Prior Authorization
Insurance companies use prior authorization to control costs and, in theory, to protect patient safety. A medication might require prior authorization for any of the following reasons:
- Cost: The drug is expensive, and your insurer wants to confirm that a less costly alternative wouldn’t work just as well.
- Safety concerns: The medication has serious side effects or is harmful when combined with other drugs you’re taking.
- Abuse potential: The drug carries a risk of misuse or dependency.
- Off-label use: Your doctor is prescribing it for a condition it wasn’t originally designed to treat, and the insurer wants clinical justification.
Not every medication requires prior authorization. Drugs on your plan’s “preferred” list, sometimes called a formulary, typically don’t need it. The medications that do are often newer brand-name drugs, specialty medications like biologics, and non-preferred alternatives in a drug class where the insurer already covers a similar option. New-to-market drugs almost always default to non-preferred status until they’ve been formally reviewed, which means they usually require prior authorization from the start.
How the Process Works
The process begins when your doctor writes you a prescription and either the pharmacy or the prescriber’s system flags it as requiring prior authorization. From there, your doctor’s office handles most of the work. They submit a request to your insurance company that includes your diagnosis, medical history, and the clinical reasoning for why this particular medication is needed.
The insurer reviews this documentation and makes a decision: approve, deny, or request more information. If approved, the authorization is sent to your pharmacy, and you can pick up your medication with your normal copay or coinsurance. Approvals typically last about 12 months, though the exact duration is set entirely by your insurance plan. After it expires, your doctor may need to submit a new request.
If your insurer denies the request, you have options. Your doctor can provide additional documentation, suggest a different medication, or you can begin the appeals process. You also have the option of paying the full cash price for the drug while the authorization is being sorted out, though for expensive medications this is rarely practical.
Step Therapy: Trying Cheaper Drugs First
One common form of prior authorization is called step therapy. This is when your insurer requires you to try one or more less expensive medications before they’ll approve the drug your doctor actually prescribed. The idea is to start with the most cost-effective option and only “step up” to pricier alternatives if the first-line drugs don’t work or cause intolerable side effects.
Some state Medicaid programs require trial and failure of two preferred drugs before a non-preferred medication will be covered. That means you may need to document that you’ve already tried, and had problems with, cheaper options before your insurer will pay for the one your doctor recommended in the first place.
There are protections in place. If you’re already taking a medication that works, step therapy generally cannot be applied to force you onto a different drug. And if you believe you need direct access to a specific medication without stepping through alternatives, you can request an exception from your plan. For urgent situations, exception requests are typically processed within 72 hours.
How Long It Takes
This is where the process gets frustrating. The timeline for a prior authorization decision can vary enormously. A 2024 federal rule (taking effect in 2026) will require insurers to respond within 72 hours for urgent requests and within seven days for non-urgent ones. Several states already have stricter requirements: Washington, D.C., New Jersey, and Vermont all mandate a response within 24 hours for urgent cases.
In practice, timelines don’t always match the rules. According to a physician survey by the American Medical Association, 31% of doctors reported waiting more than a week for an answer. The Mayo Clinic notes that processing can take anywhere from a few days to a few weeks, depending on how urgently the medication is needed, the complexity of the paperwork, and how quickly the insurance carrier completes its review.
The burden on medical practices is substantial. Physicians and their staff spend an average of 13 hours per week completing prior authorizations, handling roughly 39 requests per physician per week. That administrative load contributes directly to the delays patients experience. In the AMA’s 2024 survey, 93% of physicians reported that prior authorization causes care delays, and 82% said it sometimes leads patients to abandon treatment entirely.
What Happens If You’re Denied
A denial isn’t the end of the road. You have the right to appeal, and the process has two main stages.
The first is an internal appeal, where you ask your insurance company to reconsider its decision. Your denial notice will include instructions on how to file, including deadlines. You’ll need to submit a form or letter that includes your name, claim number, and health plan ID number, along with any supporting information. Your doctor can help by providing additional clinical documentation explaining why the medication is necessary. A family member or another person you trust can also file the appeal on your behalf.
Sometimes denials happen for simple reasons: missing paperwork, a coding error, or incomplete clinical notes. In those cases, your provider resubmitting the request with corrected information can resolve the issue without a formal appeal.
If your internal appeal is denied, you can request an external review. This is handled by an Independent Review Organization that has no ties to your insurance company. The external reviewer examines your case and issues a binding decision. If the review goes in your favor, your insurer is required to cover the medication. The result is final for both you and the insurance plan.
What You Can Do to Speed Things Up
You have more control over this process than it might seem. Start by calling your insurance company before your appointment, or right after, to ask whether a prescribed medication requires prior authorization and what documentation the insurer will need. This gives your doctor’s office a head start on the paperwork.
Ask your doctor’s office for a timeline and a point of contact. Find out who on their staff handles prior authorizations and check in every few days if you haven’t heard back. Requests sometimes stall because an insurer asked for additional information and the fax or message got buried.
If you’re running out of your current medication while waiting for approval, ask your doctor about a short-term bridge prescription or samples to avoid a gap in treatment. Some pharmacies will also provide a limited emergency supply for maintenance medications, though policies vary.
Keep copies of everything: the denial letter, your appeal, any clinical notes your doctor provides. If you need to escalate to an external review, having organized records makes the process significantly smoother. Your state’s department of insurance can also help if you feel your insurer is not following required timelines or procedures.