A long-standing feature of Original Medicare is quietly being tested away in six states. Traditional fee-for-service Medicare has historically let a beneficiary and doctor schedule a covered procedure without asking the program’s permission first, but a new pilot is inserting prior authorization into that path for a specific set of outpatient services. The model, called Wasteful and Inappropriate Service Reduction, or WISeR, took hold for services on or after January 15, 2026. The money consequence is the point: if a listed procedure is not approved in advance, Medicare can refuse to pay, turning a covered service into an out-of-pocket bill.
Where the pilot runs and what it covers
The test is limited by geography and by procedure, which is why many affected beneficiaries have not heard of it. Six states are in the model: New Jersey, Ohio, Oklahoma, Texas, Arizona, and Washington. Within those states, it applies to Original Medicare, the traditional fee-for-service side of the program, rather than to Medicare Advantage plans, which already use prior authorization heavily. That distinction matters because the roughly tens of millions of people in traditional Medicare chose it in part to avoid exactly this kind of gatekeeping.
The procedure list is targeted rather than broad. According to a review of the WISeR model, the services subject to review include epidural steroid injections, cervical fusion, lumbar spine decompression, vertebral augmentation, skin substitutes, and implanted nerve stimulators, delivered in outpatient settings such as hospital outpatient departments, ambulatory surgery centers, offices, and the home. These are procedures CMS flags as prone to overuse, and the model requires that a request be submitted and cleared before the service is performed.
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Why a denied authorization becomes a money problem
The financial risk lives in the gap between scheduling a procedure and getting it paid. Under the model, a request for a listed service goes to a CMS contractor for a decision before the procedure happens. If the request is approved, the authorization is valid for 120 days, giving time to schedule and complete the service. If it is not approved and the procedure goes ahead anyway, Medicare can deny the claim, and the cost can fall on the patient or the provider rather than the program.
How those decisions are made has drawn scrutiny. Reporting on the pilot describes CMS contracting with third-party technology vendors that use artificial intelligence and machine learning tools, alongside human clinical reviewers, to judge whether a requested service meets existing Medicare coverage rules. Supporters frame this as a check on wasteful care; critics worry that automated screening could slow or block procedures that a physician considers necessary, adding a layer of delay to time-sensitive treatment.
For a beneficiary, the practical exposure is twofold. The first is delay, because a procedure cannot proceed on the old schedule until the authorization clears. The second is cost, because a service performed outside the approval process risks a denied claim. In a program that patients specifically chose for its freedom from these hurdles, both effects are a departure from what traditional Medicare has meant.
The model does carve out where it will not reach, which narrows the exposure. Emergency and other urgent services are excluded, as are inpatient-only procedures, so the review applies to scheduled outpatient care rather than to anything a patient needs on short notice. A denied request is not necessarily final, either: a provider can resubmit with additional clinical documentation, and a beneficiary retains the standard Medicare appeal rights that apply to any coverage denial. Those backstops matter because the practical harm the pilot’s critics fear is delay, and a resubmission or appeal that drags on can push a scheduled procedure weeks past its original date even when the service is ultimately approved.
Documentation is the quiet variable in all of it. Because approval turns on whether a request shows the service meets Medicare’s existing coverage criteria, a procedure backed by thorough clinical notes clears faster than one submitted with thin paperwork, and a patient can reasonably ask a provider’s office how it intends to substantiate the request before a date is set.
What a patient in a test state can do
The single most useful habit in a WISeR state is to confirm the coverage path before agreeing to a listed procedure. A beneficiary can ask the treating provider whether the planned service is one of the procedures subject to the model, and whether the provider has submitted and received prior authorization. Because the provider typically initiates the request, a patient’s protection is to verify that the step has been taken rather than to assume it.
The model’s structure, described on the CMS Innovation Center page for WISeR, is a demonstration that runs through the end of 2031, meaning it is an ongoing test rather than a permanent nationwide rule. That timeline is a reason to track it: what happens in these six states over the next several years will shape whether prior authorization spreads further into traditional Medicare or is scaled back.
The unresolved question is whether a program built on avoiding gatekeeping can adopt it without eroding the trust that made it attractive. For now, the change is bounded to six states and a short list of outpatient procedures, and the beneficiary most protected is the one who treats a listed service as requiring approval first, confirms that approval exists, and understands that a skipped step can convert a covered procedure into a bill the program declines to pay.
This article was produced with AI assistance and reviewed against primary sources by The Money Overview editorial team.
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