13 services need Medicare's new AI prior authorization. Physical therapy isn't one, but your referrals are.

"Medicare using artificial intelligence to approve or deny care" is the kind of headline that makes an independent PT practice owner brace for new paperwork before reading past the first sentence. That instinct is reasonable. The conclusion, in this specific case, is wrong, or at least incomplete.

The Wasteful and Inappropriate Service Reduction Model, WISeR for short, is a Centers for Medicare and Medicaid Services pilot that uses AI and machine learning alongside human clinical review to decide whether Medicare will pay for 13 specific procedures in six states (Centers for Medicare and Medicaid Services, WISeR Model overview, cms.gov, 2026). Physical therapy is not one of the 13. But two of them, knee arthroscopy for osteoarthritis and epidural steroid injections for chronic pain, sit directly upstream and downstream of patients a physical therapy practice already treats. That is the part worth six minutes of your attention, not the AI headline itself.

Below are the six questions PT practice owners are actually typing into Google about WISeR, answered with the primary sources rather than the alarm.

1. Does Medicare's WISeR AI prior authorization model apply to physical therapy?

No. WISeR's prior authorization requirement covers 13 defined service categories: procedures such as knee arthroscopic lavage and debridement for osteoarthritis, epidural steroid injections for pain management, cervical fusion, percutaneous vertebral augmentation (kyphoplasty) for spinal compression fractures, skin and tissue substitutes, and several types of nerve stimulator implants (Centers for Medicare and Medicaid Services, WISeR Provider and Supplier Guide, 2026). Physical therapy CPT codes are not among them, a point the American Physical Therapy Association confirmed when the pilot was first announced (American Physical Therapy Association, "CMS Launches Voluntary Prior Authorization Model for Traditional Medicare," July 22, 2025). Your own claims do not go through this AI review process.

So what for you: nothing changes in how you bill Medicare directly. What changes is upstream, and that is the more useful question.

2. What is the WISeR model, and which states and services does it cover?

WISeR launched for dates of service on or after January 15, 2026, in six states: New Jersey, Ohio, Oklahoma, Texas, Arizona, and Washington, and is scheduled to run through December 31, 2031 (CMS, WISeR Model overview, 2026). It sits inside the CMS Innovation Center and pairs AI and machine learning tools, operated by contracted technology vendors, with a human clinical reviewer before a final decision. The 13 covered categories cluster around pain management, orthopedics, and a handful of device-based procedures federal auditors flagged for unusually high spending growth: skin substitute billing rose nearly 700% over two years, according to a Department of Health and Human Services Inspector General report cited in reporting on the rollout (HHS Office of Inspector General, via KFF Health News, June 23, 2026).

So what for you: if your practice sits outside the six pilot states, none of this affects you yet. If it doesn't, the relevant question isn't your billing, it's your referral pipeline.

3. Does WISeR require documentation that a patient tried physical therapy first?

Yes, and this is the detail most coverage of WISeR misses. For procedures like knee arthroscopic debridement and epidural steroid injections, WISeR's medical-necessity review looks for documented prior conservative treatment, physical therapy, medication trials, and non-surgical management, alongside imaging that supports the diagnosis (Noridian Medicare, WISeR Model provider guidance, 2026; Muni Health, "CMS WISeR Model Prior Authorization 2026: Complete Provider Guide," 2026). A referring orthopedist or pain specialist in one of the six pilot states now has a sharper administrative reason to have a physical therapy trial on file before submitting a request for one of the 13 covered procedures.

So what for you: this is a referral conversation worth having proactively with the orthopedists and pain clinics who send you patients, or the ones you send patients to. A documented course of physical therapy is no longer just good clinical practice, it's part of what gets a WISeR request approved faster.

4. How long does WISeR prior authorization actually take?

CMS states a 72-hour turnaround for standard requests submitted through a WISeR participant's electronic portal, and two days for expedited requests where a delay could seriously affect the patient (CMS, WISeR Model Frequently Asked Questions, cms.gov, 2026). In practice, KFF Health News and CBS News reporting published June 23, 2026 and updated July 6, 2026 found six-to-eight-week delays on some kyphoplasty claims in Oklahoma, a Phoenix pain physician still unpaid for nine epidural procedures as of May 2026, and nearly 100 patients waiting on epidural injections at the University of Washington's medical system earlier in the year, per an April 2026 report from Senator Maria Cantwell's office. The same reporting cites Humata Health's chief executive stating an 88% immediate-approval rate in cases where the clinical documentation already supports the request.

So what for you: the gap between the 88% immediate-approval cases and the delayed minority tracks closely with documentation quality, which is the one part of this process a referring clinician, or you, can actually influence.

5. Is the WISeR AI review causing real problems for patients and providers?

By multiple independent accounts, yes, in its first six months. Physicians quoted by KFF Health News describe denials citing information contradicted by the submitted chart, what several called AI-driven documentation errors, alongside payment backlogs still being resolved as of April 2026. CMS's Innovation Center director, Abe Sutton, has acknowledged the agency is accounting for a rise in appeal volume and says there are currently no planned changes to which 13 services are covered, but that the agency "continues to assess" (KFF Health News, June 23, 2026, updated July 6, 2026). Separately, a KFF poll from January 2026 found 69% of insured US adults already consider prior authorization a burden to their care, before WISeR's AI layer is factored in.

So what for you: treat early friction as expected, not exceptional. If a referred procedure stalls, the delay is far more likely to sit with the WISeR review than with anything in your own documentation or scheduling.

6. Should a PT practice owner do anything differently because of WISeR?

Two things, both low-cost. First, if you're in one of the six pilot states and regularly exchange referrals with orthopedics or pain management around knee osteoarthritis or chronic back and neck pain, confirm your discharge notes and treatment summaries are structured clearly enough to serve as the conservative-treatment documentation a WISeR reviewer looks for: dates, frequency, and outcome measures, not narrative prose. Second, set expectations with patients referred out for one of the 13 covered procedures that a delay, if one happens, is coming from the federal review process, not from you or the surgeon. One family physician quoted in the same reporting expects the pilot to expand to more procedures if it demonstrates savings (Mary Clarke, Stillwater, Oklahoma, quoted in KFF Health News, June 23, 2026); that is her opinion, not confirmed CMS policy, and worth watching rather than acting on today.

So what for you: WISeR is not a threat to your Medicare billing in 2026. It's a reason to tighten the paperwork you hand off to the specialists you already work with.

The bottom line

WISeR will not touch a physical therapy claim directly before at least 2031, and CMS says it has no current plans to add PT to the 13 covered categories. What has already changed, in six states, is how much weight a documented course of physical therapy carries inside a specialist's own prior authorization request. If you already have a working referral relationship with orthopedics or pain management in New Jersey, Ohio, Oklahoma, Texas, Arizona, or Washington, that relationship, and the paperwork behind it, is a more useful place to spend attention this quarter than the AI headline itself. For the wider administrative cost prior authorization already imposes on PT practices regardless of WISeR, see the $34,000 a year most PTs already lose to prior authorization.

Related: $34,000 a year: prior authorization's true cost for PTs  ·  $15 vs $150: the physio AI scribe decision  ·  6 AI ROI questions solo clinicians ask, with actual numbers

This article is for informational purposes only and does not constitute legal, clinical, or billing advice. Prior authorization requirements and pilot program details can change; confirm current rules with CMS or your Medicare Administrative Contractor before acting on any referral or billing decision.