Original Medicare has always let patients see any provider or supplier who accepts it, with claims paid after the fact under long-published coverage rules. A new model launched this year adds a layer that looks more like commercial insurance: outside companies using artificial intelligence and machine learning to help decide, in advance in some cases, whether a specific service should be paid for at all. The companies doing that reviewing are compensated based on how much unnecessary spending they help avoid.
What the WISeR Model Actually Reviews
The Wasteful and Inappropriate Service Reduction Model, known as WISeR, is run by the CMS Innovation Center and covers a narrow list of services rather than all of Original Medicare. The selected items are skin and tissue substitutes, electrical nerve stimulators, and knee arthroscopy for knee osteoarthritis. Each was chosen because it can pose patient-safety concerns if used inappropriately, already has publicly available coverage criteria CMS can measure against, and has a documented history of fraud, waste or abuse complaints. The model deliberately excludes inpatient-only services, emergency care, and anything that would pose a substantial risk to a patient if delayed for review.
Those specifics come from CMS’s own model fact sheet, which sets the model to run for six performance years, from January 1, 2026 through December 31, 2031.
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How the Companies Reviewing Claims Get Paid
The participants CMS selected for WISeR are companies with existing experience managing prior authorization for other payers using enhanced technology, and they’re required to employ clinicians qualified to conduct medical reviews. Their payment isn’t a flat fee for processing volume. According to the model’s own overview, participants receive a percentage of the reduction in savings that CMS can attribute to their work reducing wasteful or inappropriate care for each selected service. In practice, that means a reviewer’s revenue rises as more requests are denied or reduced, which is the same savings-share structure used in several other value-based arrangements the CMS Innovation Center has tested for non-Medicare payers.
What Happens When a Claim Gets Flagged
Providers and suppliers in the model’s assigned regions aren’t required to use prior authorization at all. They can instead let a claim go through a post-service, pre-payment medical review once the service has already been delivered. Providers who do seek prior authorization can send the request either straight to the model participant or through their Medicare Administrative Contractor, which forwards it along. Either way, any recommendation not to pay a claim has to be made by an appropriately licensed clinician applying standardized, transparent, evidence-based procedures, not by an algorithm acting alone. CMS says existing administrative appeal rights are unaffected, so a denial can still be challenged through the same channels providers already use.
Why CMS Built This Model in the First Place
CMS frames WISeR as an answer to a specific waste problem, not a general cost-cutting exercise. The model’s own materials cite Medicare Payment Advisory Commission estimates that the program spent up to $5.8 billion in 2022 on services with little to no clinical benefit, and note that waste of this kind can represent up to a quarter of national health care spending broadly. WISeR sits inside the CMS Innovation Center, the unit created specifically to develop and test new Medicare and Medicaid payment and delivery approaches before deciding whether to expand them system-wide. Testing a savings-share prior authorization model on three narrow, well-documented service categories, rather than rolling it out across all of Original Medicare immediately, fits that unit’s standard approach of running a bounded pilot with defined performance years before any broader policy decision gets made.
What Doesn’t Change for Patients
CMS is explicit that WISeR does not change Medicare coverage or payment policy, and that people with Original Medicare keep full freedom to see any provider or supplier who accepts it. Payment amounts for covered services aren’t changing either; the model is testing how a claim gets reviewed before payment, not what Medicare pays once a claim is approved. It’s also worth knowing what WISeR doesn’t touch at all: it has no application to people enrolled in Medicare Advantage, since those plans already run their own prior authorization processes outside this model. That distinction matters for anyone trying to figure out whether this applies to their own coverage: a person’s Medicare card or plan type, not their diagnosis or the state they live in, determines whether WISeR’s review process could ever touch one of their claims.
CMS says it will track participant performance across three areas: how often decisions are challenged and reversed, how quickly and clearly determinations are communicated to patients and providers, and clinical measures like whether patients end up needing alternative services, over the model’s full run through 2031. CMS also says it will publish model data and independent evaluation results as WISeR progresses, the same transparency practice it applies to its other Innovation Center models, so the program’s actual denial and appeal-reversal rates should become publicly checkable well before the six-year test ends.
This article was produced with AI assistance and reviewed by a human editor. Figures are linked to their primary sources; where a claim could not be verified from the public record, we say so.
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