Will My Original Medicare Service Need Prior Authorization in 2026?

Is prior authorization coming to Original Medicare in 2026?

Yes, prior authorization is coming to selected Original Medicare services in six states through the WISeR Model, which began on January 1, 2026, and is scheduled to continue through December 31, 2031. This is a limited test, not a new requirement for every doctor visit, supply, or procedure.

Prior authorization is a review before a service is furnished. Coverage rules are the standards Medicare already uses to decide whether it will pay. WISeR applies the second through the first: the review relies on existing National Coverage Determinations, Local Coverage Determinations, and the clinical documentation submitted with the request, according to the CMS WISeR Provider and Supplier Operational Guide.

That distinction matters. A prior-authorization request can receive a provisional affirmation or non-affirmation based on existing requirements, as CMS explains in its July 2025 Federal Register notice. The model is intended to use technology-enabled review for selected fee-for-service services; it does not rewrite what Original Medicare covers.

For many beneficiaries outside this pilot, the baseline remains familiar: Medicare.gov says Original Medicare generally does not require prior authorization for services or supplies. That is different from Medicare Advantage, where plans may require approval before covering certain services or supplies.

Which states are included in the Medicare WISeR pilot?

The WISeR pilot includes Arizona, New Jersey, Ohio, Oklahoma, Texas, and Washington. Location is the first filter: the model concerns selected services furnished in these states, rather than a beneficiary's nationwide Original Medicare coverage.

The affected setting can also be broader than readers expect. CMS lists hospital outpatient departments, ambulatory surgery centers, offices, and homes among the places where WISeR may operate for selected services. The practical question is not whether a service happens in a hospital; it is whether it is on the selected-service list, furnished in a pilot state, and covered by the model's current rules.

Medicare Advantage and Railroad Medicare are outside WISeR. CMS states directly that those beneficiaries are not impacted by the model. That does not mean a Medicare Advantage plan has no approval process; it means the plan's own rules, rather than WISeR, govern that question.

What services could require approval before Original Medicare pays?

In 2026, the selected-service list includes knee arthroscopy for osteoarthritis, several nerve stimulators, epidural steroid injections, vertebral augmentation, cervical fusion, hypoglossal nerve stimulation for sleep apnea, incontinence-control devices, impotence treatment, and specified skin and tissue substitute applications. CMS describes these as selected categories, so the service description and supporting record are important.

Providers and suppliers furnishing a selected WISeR service have two paths under the CMS operational guide. They can submit a prior-authorization request before furnishing the service, or furnish the service and have the resulting claim undergo pre-payment medical review. The first path creates a decision point before care; the second shifts review to the payment stage. Neither path guarantees payment or changes the underlying coverage criteria.

A four-part scheduling check

1. Confirm the coverage type and state. The relevant combination is Original Medicare, a WISeR pilot state, and a selected service.
2. Match the service to Medicare's existing requirements. The record needs to support the applicable National or Local Coverage Determination and the clinical facts CMS requires.
3. Identify the submission route. CMS says a request sent directly to a WISeR participant electronic portal has a 72-hour turnaround requirement. A request sent through a Medicare Administrative Contractor may take additional time.
4. Document urgency when it exists. CMS permits a requester to seek expedited review when a delay could seriously jeopardize the beneficiary's life or health, with supporting documentation.

This framework helps prevent a common confusion: an administrative delay and a coverage denial are not the same event. A portal response requirement does not establish that a service meets coverage criteria, and a longer route through a Medicare Administrative Contractor does not itself decide medical necessity. Keeping the submission record, clinical documentation, and decision notice together makes the next step clearer.

How to respond when approval delays or denies care

A delay calls for a status-and-urgency review. The provider or supplier can determine whether the request went through the WISeR participant portal or a Medicare Administrative Contractor, because CMS assigns the 72-hour turnaround requirement to the portal route. If the care delay could seriously jeopardize life or health, the CMS FAQ says expedited review may be requested with documentation supporting that urgency.

A non-affirmation calls for a documentation-and-rights review. It reflects the information submitted against existing Medicare requirements; it is not a change to benefits. CMS says WISeR does not change Medicare appeal rights, so an eventual Original Medicare coverage or payment decision can be addressed through the established appeals process.

According to Medicare.gov's Original Medicare appeals guidance, there are five appeal levels, beginning with a redetermination by the Medicare Administrative Contractor. The guidance says a beneficiary can use the Medicare Summary Notice or a Redetermination Request Form and include supporting evidence such as a doctor's note. Medicare.gov also states that the Medicare Administrative Contractor generally decides a Level 1 appeal within 60 days after receiving it.

For a budget-minded household, the useful system is recordkeeping rather than guesswork: retain the request, the clinical materials used to support it, the decision or notice, and dates tied to the service. For other Original Medicare cost questions, including the separate prescription-drug benefit, see How Do the 2026 Medicare Part D Deductible, 25% Coinsurance, and $2,100 Cap Work?.