Your doctor writes a prescription or orders a procedure, and you assume insurance will cover it. Then you get a call: it requires prior authorization. Suddenly, treatment is on hold. So what does prior authorization mean, and why does it stand between you and the care your doctor prescribed? An American Medical Association survey found that 94% of physicians reported care delays due to prior authorization, with 30% saying it led to a serious adverse event for a patient. This guide breaks down the process, the timeline, and what you can do to move it forward.
What Does Prior Authorization Mean?
Prior authorization — also called preauthorization, precertification, or prior approval — is a requirement by your health insurance plan that your doctor obtain the insurer’s approval before prescribing a specific medication, performing a procedure, or ordering a medical service. Without that approval, the plan may refuse to pay, leaving you responsible for the full cost.
The stated purpose is cost control and clinical appropriateness. Insurers argue that prior authorization prevents unnecessary treatments, steers patients toward cost-effective alternatives, and ensures that prescribed therapies align with clinical evidence. Critics counter that it creates administrative burdens, delays care, and sometimes overrides legitimate clinical judgment.
Which Medications and Services Require Prior Authorization?
Prior authorization requirements vary by plan, but certain categories are almost always subject to review.
Specialty medications. Biologics, oral oncology drugs, and other high-cost therapies nearly always require prior authorization. These drugs can cost thousands of dollars per month, giving insurers a strong financial incentive to verify medical necessity. For context on these medications, see our guide to specialty pharmacy services.
Brand-name drugs with generic alternatives. If a cheaper generic exists, your plan may require prior authorization for the brand-name version. You or your doctor must demonstrate why the generic is not suitable — for example, due to allergies, treatment failure, or differences in inactive ingredients.
Advanced imaging. MRIs, CT scans, and PET scans frequently require preauthorization. Plans want to confirm that the imaging is medically necessary and that less expensive diagnostic options have been considered.
Surgeries and inpatient admissions. Most planned surgeries, hospital stays, and rehabilitation admissions require prior approval. Emergency admissions are generally exempt, though notification requirements may still apply.
Durable medical equipment. Wheelchairs, CPAP machines, prosthetics, and other equipment often require prior authorization, particularly for higher-cost items.
How the Prior Authorization Process Works
Understanding the step-by-step process helps you anticipate delays and stay informed.
Step 1: Your Doctor Submits the Request
Your physician’s office submits a prior authorization request to your insurance plan or PBM. This typically includes clinical documentation — diagnosis codes, treatment history, lab results, and a rationale for why the specific medication or service is medically necessary.
Step 2: The Insurer Reviews
A clinical reviewer at the insurance company or PBM evaluates the request against the plan’s coverage criteria. Some requests are approved automatically through electronic systems. Others go to a medical director or pharmacist for manual review.
Step 3: Decision
The insurer issues an approval, denial, or request for additional information. According to CMS, Medicare Advantage plans must respond to standard prior authorization requests within 7 calendar days and urgent requests within 72 hours. Commercial plans follow state-specific timelines, which vary considerably.
Step 4: If Denied — Appeal
A denial is not the final word. You and your doctor can appeal, providing additional clinical evidence or arguing that the insurer’s criteria do not apply to your situation. Most plans offer multiple levels of appeal, and external review by an independent third party is available if internal appeals fail.
How Long Does Prior Authorization Take?
Timelines depend on the type of request, the insurer, and whether additional documentation is needed. Here are general benchmarks:
- Standard requests: 3 to 14 business days for most commercial plans; up to 7 calendar days for Medicare Advantage
- Urgent/expedited requests: 24 to 72 hours when a delay could jeopardize the patient’s health
- Electronic prior authorization (ePA): Minutes to hours for straightforward cases processed through automated systems
The AMA has advocated strongly for wider adoption of electronic prior authorization, which can reduce processing time from days to minutes. Several states have passed legislation mandating ePA for certain plan types.
Tips to Get Prior Authorization Approved Faster
While you cannot control the insurer’s timeline, you can take steps to minimize delays.
Ask your doctor’s office to submit complete documentation upfront. Incomplete requests are the most common cause of delays. Ensure that diagnosis codes, treatment history, and clinical rationale are all included with the initial submission.
Request expedited review when appropriate. If delaying treatment could cause harm, your doctor can request urgent review. Document the clinical urgency clearly.
Follow up proactively. Call your insurer 48 to 72 hours after submission to confirm the request was received and is being processed. Keep a log of dates, reference numbers, and the names of representatives you speak with.
Know your plan’s criteria. Many insurers publish their prior authorization criteria online. If you can see exactly what clinical evidence they require, you and your doctor can tailor the submission accordingly.
Use your pharmacy’s resources. Specialty pharmacies routinely handle prior authorizations and can advocate on your behalf. If your prescription is routed through CVS Specialty or another specialty pharmacy, their care team will often manage the entire PA process.
The Debate Over Prior Authorization
Prior authorization sits at the center of an ongoing tension between cost control and patient access. Insurers point to data showing that PA prevents inappropriate prescribing and saves the healthcare system billions. Physicians argue that the volume of PA requirements has become unsustainable, consuming an average of nearly two business days per week of physician practice time according to the AMA.
Legislative reform is underway at both the federal and state levels. The Improving Seniors’ Timely Access to Care Act, which passed in 2022, requires Medicare Advantage plans to streamline and automate prior authorization processes. Several states have enacted laws requiring faster turnaround times, transparency in approval criteria, and “gold carding” programs that exempt physicians with high approval rates from PA requirements.
The role of PBMs in prior authorization has also drawn scrutiny. PBMs like CVS Caremark and Express Scripts set PA criteria for prescription drugs on behalf of insurance plans. Understanding how PBMs influence your medication access is important — our article on PBM services explores this in detail.
Prior Authorization for Medicare Beneficiaries
Medicare beneficiaries face prior authorization in two main areas: Medicare Advantage plans and Medicare Part D prescription drug coverage. Original Medicare (Parts A and B) uses prior authorization for a limited set of services, including certain durable medical equipment, non-emergency ambulance transport, and some outpatient procedures.
CMS has taken steps to reduce PA burden on Medicare beneficiaries. Recent rules require Medicare Advantage plans to provide specific reasons for denials, maintain consistent criteria throughout the plan year, and process requests electronically. If you are on a Medicare Part D plan, your Medicare formulary will indicate which drugs require prior authorization.
Frequently Asked Questions
What does prior authorization mean for prescriptions?
It means your insurance plan requires your doctor to get approval before the plan will cover a specific medication. The doctor must submit clinical documentation demonstrating that the drug is medically necessary for your condition.
Can I pay out of pocket to avoid prior authorization?
Yes. You can choose to pay the full cash price for a medication without going through prior authorization. However, for specialty drugs that cost thousands of dollars, this is rarely practical. Discount programs like GoodRx may help reduce cash prices for some medications.
What happens if prior authorization is denied?
You have the right to appeal. Your doctor submits additional clinical information, and the insurer reviews the case again. If internal appeals fail, you can request an external review by an independent party. Many denials are overturned on appeal.
How often do prior authorizations get approved?
Approval rates vary by insurer and drug, but the AMA reports that the vast majority of prior authorization requests are eventually approved — suggesting that the process delays access to care that would have been provided anyway.
Does prior authorization apply to emergency care?
Generally no. Federal law (the Emergency Medical Treatment and Labor Act) requires hospitals to provide emergency care regardless of insurance status. However, some plans require notification within 24 to 48 hours of an emergency admission.
Practical Steps When You Face Prior Authorization
Knowing what prior authorization means is half the battle. The other half is acting quickly. Ask your doctor’s office to submit the request the same day the prescription is written. Follow up within 48 hours. If you are denied, appeal immediately — do not let the clock run out. And if the process feels overwhelming, remember that specialty pharmacies and patient advocacy organizations exist to help you navigate it. For more on how insurance and pharmacy benefits work in the U.S., explore our healthcare policy guide.