What Is Prior Authorization in Health Insurance?

By the Florida Plan Finder Team · Licensed Florida Health Insurance Producer · NPN #21249133 · Last Updated: April 8, 2026

Prior authorization — sometimes called precertification or preapproval — is one of the most common points of friction in the health insurance system. It is the process by which your insurance company requires advance approval before agreeing to cover a specific medical service, procedure, or medication. While it is designed to ensure services are medically necessary and cost-effective, it can also create delays and frustration for patients and providers. Understanding how prior authorization works, which services require it, and what to do when it is denied gives you the tools to navigate the process effectively.

Why Insurers Require Prior Authorization

Prior authorization exists for several reasons, all rooted in cost management and clinical appropriateness:

• Medical necessity review: The insurer verifies that the requested service is clinically appropriate for your condition based on evidence-based guidelines.
• Cost control: Prior auth ensures that less expensive but equally effective alternatives are considered before approving costly procedures or drugs.
• Preventing unnecessary procedures: Some services carry risks (e.g., surgery, contrast imaging) and prior review ensures they are warranted.
• Step therapy enforcement: For medications, the insurer may require you to try a lower-cost drug first before approving a more expensive one.

According to the American Medical Association, 88% of physicians report that prior authorization requirements have increased over the past five years, and the administrative burden is a leading source of provider frustration.

Services That Commonly Require Prior Authorization

While each plan has its own prior authorization list, the following services commonly require preapproval on Florida ACA marketplace plans:

• Advanced imaging: MRI, CT scan, PET scan
• Elective surgery: Joint replacement, bariatric surgery, spinal procedures
• Inpatient hospital admissions: Planned hospitalizations (emergency admissions are typically authorized retroactively)
• Specialty medications: Biologics, cancer drugs, immunosuppressants, and other Tier 4 drugs
• Durable medical equipment (DME): Wheelchairs, CPAP machines, prosthetics
• Outpatient procedures: Certain diagnostic procedures, physical therapy beyond initial visits, some mental health services
• Home health services: Skilled nursing visits, home infusion therapy

Preventive care services mandated by the ACA — annual physicals, recommended screenings, immunizations — never require prior authorization on ACA-compliant plans.

How the Prior Authorization Process Works

The process follows a standard flow, though timelines and specifics vary by insurer:

• 1. Your doctor determines a service is needed — specialist referral, imaging study, surgery, or medication.
• 2. Your doctor's office submits a prior authorization request to your insurer, including clinical documentation (diagnosis, medical history, previous treatments tried, clinical rationale).
• 3. The insurer reviews the request against clinical guidelines and coverage criteria. A medical reviewer (often a nurse or physician) evaluates whether the service meets the plan's standards for medical necessity.
• 4. The insurer issues a decision: approved, denied, or approved with modifications (e.g., approving a different imaging type or a lower-cost medication alternative).
• 5. If approved, the service can proceed and the claim will be covered under your plan's normal cost-sharing rules.
• 6. If denied, the insurer must provide a written explanation of the denial reason and inform you of your appeal rights.

Timelines: Standard vs. Urgent

Under ACA-related rules, insurers must respond to prior authorization requests within specific timeframes:

If the insurer needs additional information, they may request it from your provider, which can extend the timeline. If the insurer fails to respond within the required timeframe, some state regulations treat the authorization as deemed approved — though this varies by jurisdiction.

What Happens If You Skip Prior Authorization

If a service requires prior authorization and you receive it without obtaining approval, the consequences can be severe:

• The insurer may deny the claim entirely, leaving you responsible for the full cost of the service.
• Some plans offer retroactive authorization in genuine emergencies, but this is not guaranteed and requires documentation that the situation was truly urgent.
• Even if the service was medically necessary, the lack of prior auth alone can be grounds for denial — the insurer's objection is procedural, not clinical.

How to Appeal a Prior Authorization Denial

If your prior authorization request is denied, you and your provider have several options:

• Peer-to-peer review: Your doctor can request a direct conversation with the insurer's medical reviewer to discuss the clinical rationale. This often resolves denials that are based on insufficient documentation.
• Internal appeal: Submit a formal written appeal within the insurer's specified timeframe (typically 180 days). Include additional clinical evidence, letters of medical necessity from your provider, and any relevant guidelines.
• External review: If the internal appeal is denied, request an independent external review. Under the ACA, this is conducted by an independent organization and the decision is binding on the insurer.
• Florida OIR complaint: File a complaint with the Florida Office of Insurance Regulation for additional investigation and potential intervention.

Tips for Avoiding Prior Authorization Delays

• Ask your doctor's office to submit the prior auth request as early as possible — don't wait until the week of your procedure.
• Provide complete and accurate information upfront to avoid back-and-forth requests for additional documentation.
• Check your plan's prior authorization list (available on your insurer's website or by calling member services) before scheduling services.
• Follow up with both your provider and your insurer if you haven't heard back within the expected timeline.
• If you're switching plans during Open Enrollment, check whether your current treatments will require new prior authorizations under the new plan.