Prior Authorization in Medicare: What You Need to Know

If you have ever been told that a medical service needs to be "approved" before your insurance will pay for it, you have encountered prior authorization. This process is a routine part of health insurance, and it plays a particularly significant role in Medicare Advantage plans. Understanding how prior authorization works, when it applies, and what to do if your request is denied can help you navigate the system with greater confidence and avoid unexpected bills.

What Is Prior Authorization?

Prior authorization is a requirement that your health plan approve a medical service, procedure, or prescription drug before it is provided. The purpose is for the plan to verify that the requested care is medically necessary and consistent with its coverage guidelines before committing to pay for it.

Here is how the process generally works:

• Your doctor determines that you need a specific service, test, procedure, or medication
• Your doctor's office submits a prior authorization request to your plan, along with supporting clinical documentation
• The plan reviews the request against its medical necessity criteria
• The plan either approves, denies, or requests additional information
• If approved, you can proceed with the service and the plan will cover it according to your benefit terms
• If denied, you have the right to appeal the decision

Prior authorization is sometimes called prior approval or precertification, although there are subtle differences between these terms that are discussed later in this article.

When Does Prior Authorization Apply?

Prior authorization requirements are far more common in Medicare Advantage plans than in Original Medicare. Under Original Medicare (Parts A and B), prior authorization is rarely required. Medicare generally pays for services that meet its coverage criteria without requiring advance approval, though there are limited exceptions for certain items like power wheelchairs and some home health services.

In Medicare Advantage plans, prior authorization may be required for:

• Elective surgeries such as joint replacements, spinal procedures, and bariatric surgery
• Advanced imaging including MRIs, CT scans, and PET scans
• Specialty medications particularly injectable or infusion drugs
• Durable medical equipment such as motorized wheelchairs, hospital beds, and oxygen equipment
• Certain outpatient procedures and specialist referrals depending on the plan
• Inpatient hospital admissions for non-emergency care
• Post-acute care including skilled nursing facility stays and home health services

The specific services that require prior authorization vary from one MA plan to another. Your plan's Evidence of Coverage document lists all services that need advance approval.

Recent CMS Streamlining Rules

In response to widespread concerns about delays in care caused by prior authorization, the Centers for Medicare & Medicaid Services (CMS) has implemented rules aimed at streamlining the process for Medicare Advantage plans.

Key changes include:

• Faster decision timelines: Plans must issue standard decisions within seven calendar days for medical services and 72 hours for drugs. Expedited requests must be resolved within 24 to 72 hours.
• Electronic processing: CMS has pushed plans to adopt electronic systems for faster submissions and decisions.
• Transparency requirements: Plans must publish data on approval rates, denial rates, and processing times.
• Continuity of care: Previously approved authorizations may be honored for a transition period when you switch plans.
• Reducing unnecessary requirements: CMS has encouraged plans to remove prior authorization for services with historically high approval rates.

These reforms reduce the burden of prior authorization, though the process remains a significant factor in how quickly you can access care under many MA plans.

Prior Authorization vs. Pre-Certification

While the terms are sometimes used interchangeably, they are not identical. Prior authorization is a clinical determination that the requested service is medically necessary, based on your medical records. Pre-certification (also called pre-notification) is primarily an administrative process that notifies the plan about an upcoming service, focusing on confirming coverage eligibility rather than medical necessity.

In practice, many MA plans combine these into a single step. However, a pre-certification approval does not always guarantee payment if the plan later determines the service was not medically necessary.

What to Do If Your Prior Authorization Is Denied

A denial does not have to be the final word. If your prior authorization request is denied, you have the right to appeal through a structured process. Here is what to do:

1. Understand the reason for denial. Your plan must provide a written explanation of why the request was denied, including the specific criteria that were not met.

2. Gather supporting documentation. Work with your doctor to compile medical records, test results, treatment history, and a letter of medical necessity that addresses the plan's stated reasons for denial.

3. File a Level 1 appeal (plan reconsideration). Submit your appeal to the plan within 60 days of receiving the denial notice. The plan must decide within 30 days for standard requests or 72 hours for expedited requests.

4. Escalate if necessary. If the plan upholds the denial, you can appeal to an Independent Review Entity (IRE), which is an outside organization that reviews the case independently. Further appeal levels include an Administrative Law Judge hearing, the Medicare Appeals Council, and federal court.

5. Request an expedited review if delaying the service could seriously harm your health. Expedited appeals have shorter timelines to ensure you receive a timely decision.

Statistics show that a meaningful percentage of prior authorization denials are overturned on appeal, particularly when additional clinical information is provided. Do not assume that an initial denial means the service will not be covered.

How Prior Authorization Affects Access to Care

The impact of prior authorization on patient care is a subject of ongoing debate. Supporters argue that it prevents unnecessary procedures and controls costs, which benefits the health care system as a whole. Critics point to legitimate concerns:

• Delays in treatment: The time required to obtain authorization can postpone needed care by days or weeks
• Administrative burden on providers: Doctors and their staff spend significant time completing authorization paperwork, which takes resources away from patient care
• Potential for inappropriate denials: Some authorization requests are denied based on rigid criteria that may not account for individual patient circumstances
• Patient frustration and confusion: Navigating the authorization process can be stressful, particularly for beneficiaries who are dealing with serious health conditions

If you are enrolled in a Medicare Advantage plan, being proactive about prior authorization can help minimize disruptions. Ask your doctor's office whether prior authorization is needed before scheduling any procedure, and follow up to confirm approval before your appointment date. Review your Evidence of Coverage to understand which services require it, keep copies of all authorization correspondence, and exercise your right to appeal any denial. Prior authorization is a reality of modern health insurance, but understanding how it works puts you in a stronger position to advocate for the care you need.