The WISeR Model Medicare pilot went live January 1, 2026, in six states, and it changes how practices get paid for a narrow list of services. It layers prior authorization or pre-payment review onto Original Medicare fee-for-service claims, a step traditional Medicare has almost never required before now.

What Is the WISeR Model in Medicare Right Now?

The WISeR Model Medicare pilot is a six-year CMS Innovation Center test running January 1, 2026 through December 31, 2031 in Arizona, New Jersey, Ohio, Oklahoma, Texas, and Washington. It requires prior authorization or pre-payment review for select outpatient services in Original Medicare, using AI-assisted contractors and mandatory human clinical review.

CMS built WISeR on a simple premise: fee-for-service Medicare pays for volume, and volume-based payment invites overuse. So the agency picked ten service categories with documented histories of low clinical value or fraud risk and handed their review to private technology vendors under six-year contracts. Each vendor covers a Medicare Administrative Contractor jurisdiction, not a single state, which matters for anyone billing across state lines within JH or JF territory.

This is not Medicare Advantage prior authorization wearing a new label. MA plans already run roughly 1.8 authorization determinations per enrollee, compared with a tiny fraction of that in traditional Medicare. WISeR imports that utilization-management posture into a program that historically ran on trust-then-verify, and billing teams built around post-payment audits now need front-end authorization workflows they’ve never operated at scale.

The four MAC jurisdictions involved are JL (New Jersey), J15 (Ohio), JH (Oklahoma and Texas), and JF (Arizona and Washington). A practice billing across a jurisdiction boundary, say a physician group with locations in both Texas and a neighboring non-WISeR state, needs separate workflows for each site rather than a single blanket policy, since the model applies to the beneficiary’s state of service, not the practice’s home office.

Which States and Services Does WISeR Actually Cover?

WISeR applies only in Arizona, New Jersey, Ohio, Oklahoma, Texas, and Washington, and only to Original Medicare beneficiaries receiving one of ten targeted service categories including knee arthroscopy, skin substitutes, and electrical nerve stimulators. Medicare Advantage and Railroad Medicare enrollees are unaffected everywhere.

The target list includes arthroscopic lavage and debridement for osteoarthritic knees, epidural steroid injections, incontinence control devices, impotence treatment, cervical spinal fusion, hypoglossal nerve stimulation, vagus and phrenic nerve stimulation, and bioengineered skin substitutes. Deep brain stimulation and percutaneous lumbar decompression were both delayed via an April 2026 Federal Register notice, so practices billing those codes in the six states get a reprieve while CMS reworks implementation timing.

Skin substitutes deserve special attention. KFF’s independent analysis found this single category drove most of the dollar growth in WISeR-eligible spending, and CMS separately capped skin substitute payment rates nationwide starting January 2026, a change expected to cut spending on that category by nearly 90 percent on its own, independent of anything WISeR’s prior authorization does.

How Does the Prior Authorization Workflow Actually Run?

Providers submit a request directly to their assigned WISeR technology vendor, or route it through their MAC first, and the vendor must return a decision within 72 hours for standard requests or 48 hours for expedited ones. Non-affirmed requests can be resubmitted an unlimited number of times, and providers may request a peer-to-peer clinical conversation before a final denial.

Skipping authorization isn’t optional in the way some billers assume. Decline to request it, and the claim instead routes into mandatory pre-payment medical review, meaning you’ve traded a front-end delay for a documentation-intensive back-end one. Either path demands the same clinical evidence; WISeR just moves the checkpoint earlier or later in the revenue cycle, never removes it.

For outpatient hospital and ambulatory surgery center claims, the Unique Tracking Number from an affirmed authorization must appear on the facility claim. Miss it, and the claim suspends for manual medical review regardless of whether the underlying service was appropriate. Associated services, anesthesia, implants, physician professional fees, ride the coattails of the primary service determination: deny the arthroscopy, and the anesthesiologist’s claim for the same encounter gets denied too.

What Financial and Compliance Risks Does WISeR Create?

WISeR’s technology vendors are paid a percentage of averted spending, not a flat fee, which creates a direct financial incentive tied to denial volume even though CMS says vendors are scored on accuracy, not raw denial counts. Practices face cash-flow exposure from resubmission cycles, claim suspension for missing UTNs, and denial cascades across linked professional and facility claims.

That compensation structure drew formal pushback. A House Appropriations Committee amendment to defund WISeR passed committee in September 2025 but didn’t survive into the Consolidated Appropriations Act signed in February 2026, so the model proceeded on schedule. Physician groups and some members of Congress remain vocal about the incentive alignment, and that scrutiny means documentation gaps that would have drawn a routine post-payment audit letter under legacy Medicare now trigger a same-day non-affirmation instead.

Coding teams should treat NCD and LCD citation accuracy as a first-pass gate, not a backstop. Appendix C of the CMS WISeR Provider and Supplier Operational Guide lists the ICD-10 codes that narrow each CPT code’s scope; bill a WISeR-listed CPT code without a matching Appendix C diagnosis code, and the claim falls outside the model’s own scope rules, which sounds like relief but usually just means a different denial reason on the same claim.

Can Providers Earn an Exemption From Ongoing Review?

CMS is building a “gold carding” exemption program for providers who submit at least ten prior authorization requests and maintain a 90 percent or higher affirmation rate during a defined review window. Exemption status begins rolling out on a quarterly basis starting in 2026, removing both prior authorization and pre-payment review for qualifying providers.

The mechanics matter for anyone doing volume forecasting. CMS and each WISeR participant will publish jurisdiction-specific exemption criteria in spring 2026, and providers won’t see notification of exemption status until participants begin issuing it in June 2026. That’s a five-month window where even a provider on track for exemption is still filing every authorization manually, so don’t build Q1 or Q2 staffing plans around an exemption that hasn’t activated yet.

Exemption status also isn’t permanent. CMS reviews the list quarterly, which means a provider who slips below the affirmation threshold after earning exempt status can be pulled back into full prior authorization with little warning. Practices that reach exemption should keep their documentation discipline intact rather than treating the milestone as a finish line, because the same clinical evidence standards apply whether or not a claim currently requires review.

What Should Billing Teams Do Before Their Next Claim?

Practices in the six WISeR states should confirm whether they bill any targeted service, verify CPT and ICD-10 pairings against Appendix A and Appendix C of the operational guide, and route affirmed UTNs onto every associated facility and professional claim. Skipping any of these three steps invites a stalled authorization or a downstream denial.

Start with a service-line audit. Cross-reference last year’s claims against the current CPT list, because CMS explicitly reserves the right to add services during the six-year run, and the KFF analysis of WISeR’s early spending impact shows the list has already shifted once via the April 2026 delay notice. A code that wasn’t in scope in February could be in scope by fall.

Build a submission checklist that captures beneficiary MBI, full legal name, date of birth, NPI, PTAN, the specific CPT or HCPCS code, matching ICD-10 diagnosis, anticipated place of service, and units needed within a 120-day window. Missing any single field is the most common dismissal reason cited in CMS’s own operational guide, and a dismissal resets your clock rather than pausing it.

Finally, track your affirmation rate the way you’d track a KPI, not an afterthought. If gold carding exemption depends on hitting 90 percent affirmed across at least ten requests, a single sloppy submission early in the performance year can push exemption eligibility out by a full review cycle. WISeR rewards precision on the front end, and that precision is exactly what most FFS billing teams have never had to build before.