Your doctor writes a prescription and you head to the pharmacy, expecting to pick it up. Instead, the pharmacist tells you the medication requires “prior authorization.” Suddenly you are stuck waiting — no medication, no clear timeline, and no idea what went wrong. What is a prior authorization? It is a requirement from your insurance plan or pharmacy benefit manager that your doctor must get advance approval before the plan will cover a specific medication, procedure, or service. According to the American Medical Association, 94% of physicians report that prior authorization causes delays in patient care. Understanding this process can help you navigate it faster.
Prior Authorization Defined
What is a prior authorization in practical terms? It is a gatekeeping mechanism. Before your insurance agrees to pay for certain medications, your doctor must submit clinical documentation to the insurer or PBM demonstrating that the treatment is medically necessary. The insurer reviews the documentation against its coverage criteria and issues a decision — approved, denied, or approved with modifications.
Prior authorization applies to prescriptions, medical procedures, specialist referrals, imaging studies, and durable medical equipment. For prescription drugs, the PBM managing your pharmacy benefits — such as Express Scripts, CVS Caremark, or OptumRx — handles the review process.
The stated purpose is twofold: controlling costs and ensuring appropriate care. Insurers argue that prior authorization prevents unnecessary treatments and steers patients toward cost-effective alternatives. Critics counter that it creates barriers to timely care, places administrative burdens on doctors, and sometimes delays life-saving medications.
Why Insurers Require Prior Authorization
Cost is the primary driver. Prescription drug spending in the United States exceeds $400 billion annually, according to CMS. High-cost specialty drugs, new-to-market medications, and drugs with cheaper therapeutic alternatives are the most common targets for prior authorization.
Insurers also use prior authorization to enforce clinical guidelines. A plan might require authorization for an opioid pain medication to verify that the prescriber has considered non-opioid alternatives first. For a biologic used to treat rheumatoid arthritis, the insurer might want documentation that the patient tried and failed on at least one conventional disease-modifying drug.
Safety plays a role too. Some medications carry significant risks — organ toxicity, dangerous drug interactions, or potential for abuse. Prior authorization gives the insurer an opportunity to verify that appropriate monitoring is in place and that the prescriber has weighed the risks.
How the Prior Authorization Process Works
The process follows a general pattern, though specifics vary by insurer and PBM:
Step 1: Prescription trigger. You present a prescription at the pharmacy. The pharmacist submits it electronically to your PBM. The PBM’s system flags the drug as requiring prior authorization and rejects the claim with a message indicating PA is needed.
Step 2: Doctor’s submission. The pharmacist informs you, and your doctor’s office receives notification. Your prescriber (or their staff) completes a prior authorization form, attaching clinical documentation — diagnosis codes, lab results, treatment history, and a rationale for why this specific drug is necessary.
Step 3: Insurer review. The PBM or insurer reviews the submission. A clinical pharmacist or medical director compares the documentation against the plan’s coverage criteria. For standard requests, the review typically takes 2 to 5 business days. Urgent requests — where a delay could cause serious harm — must be reviewed within 24 to 72 hours, depending on the plan type and applicable regulations.
Step 4: Decision. The insurer issues one of three decisions: approved (the drug is covered), denied (the drug is not covered under the plan’s criteria), or approved with modifications (e.g., a different dosage or quantity is approved).
Step 5: If denied — appeal. You and your doctor have the right to appeal. The appeal involves submitting additional clinical evidence. Many initial denials are overturned when the prescriber provides more detailed documentation.
How Long Does Prior Authorization Take?
Timelines depend on the type of request and the plan:
Standard requests: Most PBMs process standard prior authorizations within 2 to 5 business days. CMS requires Medicare Part D plans to respond within 72 hours for standard requests.
Urgent/expedited requests: When a delay could jeopardize the patient’s health, urgent reviews must be completed within 24 hours for Medicare Part D and within 72 hours for most commercial plans.
Appeals: If your initial request is denied, the first-level appeal typically takes 5 to 10 business days. External appeals — reviewed by an independent third party — may take 30 to 45 days for non-urgent cases.
The AMA’s 2024 survey found that physicians spend an average of 12 hours per week on prior authorization tasks, and one-third of physicians report that prior authorization has led to a serious adverse event for a patient due to treatment delays.
Tips for Getting Prior Authorization Approved
While your doctor handles the submission, you can take steps to improve your chances and speed up the process:
Check before you prescribe. Ask your doctor to verify whether the medication requires prior authorization before writing the prescription. Most PBMs offer online tools that flag PA requirements in advance.
Provide complete documentation upfront. Incomplete submissions are the most common cause of delays and denials. Make sure your doctor includes your full diagnosis, relevant lab results, prior medication history (including drugs tried and failed), and a clear statement of medical necessity.
Follow up proactively. Call the PBM or check your online account 48 hours after submission to verify the request was received and is being processed. If additional information is needed, prompt your doctor to respond quickly.
Know your appeal rights. If denied, do not give up. The appeal process exists for a reason, and a significant percentage of denials are overturned. Ask your doctor to submit a detailed letter explaining why the prescribed medication is the best clinical option for your situation. For medication-specific prior authorization strategies, we have a dedicated guide.
Prior Authorization Reform
Frustration with prior authorization has driven legislative action at both the state and federal levels. The CMS Interoperability and Prior Authorization Final Rule, finalized in 2024, requires Medicare Advantage and Medicaid managed care plans to implement electronic prior authorization systems and respond to standard requests within 7 days and urgent requests within 72 hours by 2026.
Several states have enacted their own reforms, including “gold card” laws that exempt physicians with high approval rates from prior authorization requirements. Texas was the first state to implement such a program, and others have followed. These reforms aim to reduce administrative burden while preserving the cost-control function of prior authorization.
At the federal level, bipartisan bills have sought to standardize prior authorization timelines, require real-time electronic decisions, and mandate transparency around denial rates. PBM reform efforts frequently include prior authorization provisions.
Frequently Asked Questions
Can I pay cash to avoid prior authorization?
Yes. If you pay the full cash price for a medication, prior authorization is not required because you are not using your insurance. Discount programs like GoodRx can sometimes reduce the cash price significantly. However, cash payments do not count toward your deductible or out-of-pocket maximum.
How do I know if my medication needs prior authorization?
Check your plan’s formulary on the PBM’s website. Medications requiring prior authorization are typically marked with “PA” or a similar designation. You can also call the member services number on your insurance card and ask before filling the prescription.
What happens if prior authorization is denied?
If denied, you receive a written explanation of the denial reason. Your options include appealing the decision with additional clinical documentation, asking your doctor to prescribe an alternative medication that does not require prior authorization, or paying the full cash price out of pocket.
Does prior authorization expire?
Yes. Prior authorizations are approved for a specific period — typically 6 to 12 months, though it varies by plan and medication. When the authorization expires, a new request must be submitted. Your doctor should receive notification before the expiration date.
Is prior authorization the same as a referral?
No. A referral is a recommendation from one doctor to see another. Prior authorization is insurance approval for a specific treatment, medication, or service. Some plans require both — a referral to a specialist and prior authorization for the treatment the specialist recommends.
Navigating Prior Authorization Successfully
Understanding what a prior authorization is — and why it exists — puts you in a stronger position. Stay proactive: check coverage before your doctor prescribes, ensure the submission is complete, and follow up promptly. If you face a denial, exercise your right to appeal. The system is bureaucratic, but persistence often pays off.
For guidance on how prior authorization fits into Medicare specifically, or to understand the broader policy landscape, explore our healthcare policy guide.