Medicare beneficiaries in six states now face a new requirement before receiving certain medical services: getting approval from the federal government first. The Centers for Medicare and Medicaid Services launched the Wasteful and Inappropriate Service Reduction Model, known as WISeR, applying prior authorization and pre-payment review to selected items and services under Original Medicare in New Jersey, Ohio, Oklahoma, Texas, Arizona, and Washington. The program, which took effect at the start of 2026, represents the first time Original Medicare has imposed broad prior authorization requirements on fee-for-service beneficiaries, a process previously associated almost exclusively with private Medicare Advantage plans.
How WISeR changes the rules for six states
Prior authorization requires a provider to obtain approval from an insurer or payer before delivering a service. For decades, that friction point existed mainly in commercial insurance and Medicare Advantage. Original Medicare, which covers roughly 30 million Americans on a fee-for-service basis, largely operated without it. The WISeR Model changes that dynamic by requiring providers in the six participating states to submit prior authorization requests or face pre-payment review for specified services before claims are paid.
CMS has described the model as a tool to reduce spending on services the agency considers wasteful or inappropriate. The agency’s materials indicate it will rely on technology partners to support an expedited prior authorization process, with providers able to submit requests directly to model participants or through the existing Medicare Administrative Contractor forwarding process. CMS issued a formal Change Request to implement the model’s prior authorization and medical review procedures, and the agency noted that the supporting attachments, labeled A through F, are subject to quarterly updates. That built-in revision schedule means the list of services requiring approval can expand or contract every three months without a new rulemaking cycle.
The timeline introduces some complexity. CMS documentation states the WISeR Model began January 1, 2026. A separate demonstration for ambulatory surgery centers lists prior authorization requests beginning January 5, 2026, with dates of service starting on or after January 19, 2026. Whether these two programs overlap in scope or run as parallel tracks in the same states has not been fully clarified in publicly available CMS documents, leaving providers to interpret how the initiatives interact in day-to-day billing.
Digital tools and the push for faster decisions
WISeR does not exist in isolation. It arrives as CMS promotes a broader shift toward automated and electronic approvals. The agency’s overview of electronic prior authorization outlines a strategy to move away from fax- and phone-based processes and toward standardized, real-time exchanges between providers and payers. In principle, those tools could blunt some of the administrative burden WISeR introduces, especially if providers can submit documentation directly from their electronic health record systems and receive decisions quickly enough to avoid rescheduling procedures.
How effectively that vision translates into practice for fee-for-service Medicare remains an open question. Many smaller practices in the six WISeR states may not yet have fully integrated electronic prior authorization capabilities. If the technology infrastructure lags behind the policy, the model’s promise of streamlined review could give way to manual workarounds, longer phone calls with contractors, and delays in scheduling care.
Early signals on whether prior authorization will reduce utilization
A central question is whether the WISeR Model will produce a measurable drop in the use of targeted services within the six states compared to states where the model does not apply. With roughly five months of the program now elapsed, the first two quarters of 2026 claims data should begin to show whether providers are ordering fewer of the flagged services, whether beneficiaries are experiencing delays, or whether the approval process is functioning as a procedural formality with high acceptance rates.
CMS has not published projected savings figures or expected denial rates for WISeR. No beneficiary impact data or appeals statistics from the six states have appeared in publicly available agency materials. The absence of baseline modeling makes it difficult to judge the program against its own goals. Research on prior authorization in Medicare Advantage and commercial insurance has generally shown that such requirements reduce utilization of targeted services, but they also generate administrative costs and can delay care. Whether those patterns will replicate in fee-for-service Medicare, with its different incentives and provider relationships, is not yet known.
For now, the most immediate effects are operational. Hospitals, physician groups, and ambulatory centers in the six states must identify which procedures fall under WISeR, update scheduling workflows to account for approval timelines, and train staff to submit complete documentation on the first attempt. Beneficiaries, meanwhile, may encounter new conversations at the point of care about whether a service must be approved first and what happens if a request is denied.
As CMS refines the model’s attachments and potentially adjusts the list of targeted services each quarter, stakeholders will be watching for signs of course correction. Strong evidence that WISeR can curb inappropriate care without widespread delays or denials could encourage expansion to additional states. Conversely, if early data show high administrative burden with limited savings, pressure may grow to narrow the program or rethink how prior authorization fits within Original Medicare. Until those results emerge, WISeR stands as a significant test of how far federal officials are willing to extend utilization controls into the traditional Medicare program.
Free for readers: The free Retirement Shield newsletter sends plain-English help keeping more of your money in retirement — the scams to dodge, the benefits you’re owed, and what’s changing with Social Security and Medicare, a couple times a week. Get the free newsletter.
