Medicare Handed Prior Authorization to AI. Here’s What Went Wrong.
Unanswered requests, error screens instead of approvals, and vendors quietly warned by CMS. Newly released records reveal the first months of Medicare’s AI prior authorization pilot — and Congress declined to stop it.
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The story in 60 seconds
- Since January 2026, traditional Medicare in six states has required prior authorization for selected services, reviewed by private technology vendors using AI.
- Records obtained through a FOIA lawsuit show CMS flagged problems with at least four of the six vendors within the first three months.
- One request sat for 83 days against a required 72-hour turnaround; in Texas, approval rates rose from 62% to 84% once humans reviewed the AI’s decisions.
- A Senate effort to cancel the program failed 46–50 in July 2026. The pilot is scheduled to run through 2031.
01What is WISeR?
For decades, traditional Medicare required very little prior authorization. That has started to change.
The Wasteful and Inappropriate Service Reduction (WISeR) Model is a CMS pilot that brings prior authorization — long familiar from Medicare Advantage and commercial plans — into traditional, fee-for-service Medicare. CMS announced it on July 1, 2025, and it went live in January 2026 in six states: Arizona, New Jersey, Ohio, Oklahoma, Texas and Washington, covering roughly 6.4 million beneficiaries.
The model targets services CMS considers at high risk of overuse, including skin substitutes, electrical nerve stimulators, knee arthroscopy and certain spinal procedures. Requests are reviewed by private technology companies that use AI tools, with clinicians making final denial decisions. Providers who skip prior authorization can expect the claim to go through pre-payment medical review instead.
Vendors are paid partly based on the savings from services that don’t happen. CMS’s own internal records reportedly acknowledged that this structure could reward denials, with quality penalties limited to 5–10% of vendor payments.
02What the records revealed
The Electronic Frontier Foundation sued CMS under the Freedom of Information Act in March 2026. More than 1,800 pages released in September and October 2026 paint a picture of a rocky launch:
According to the records, some vendor systems returned error messages instead of tracking numbers, delaying authorizations for patients waiting on spinal injections. One vendor’s provider portal wasn’t ready at launch. A single status report from March 30, 2026 recorded 5,944 denials from just two vendors. None of these corrective actions were made public while CMS was defending the program before Congress.
03How it unfolded
CMS announces the WISeR Model.
The model launches in six states; technical issues push the effective start to mid-January.
CMS quietly sends information requests and corrective action requests to vendors over delays, inaccurate denials and portal problems.
CMS delays two of the model’s services.
The Government Accountability Office rules that WISeR is a “rule” subject to the Congressional Review Act, opening the door to a repeal vote.
The Senate rejects a motion to take up the repeal resolution, 46–50.
FOIA records are released showing the early vendor problems.
04Why it matters to your practice
If you bill traditional Medicare in one of the six states for any covered service, prior authorization is now part of your workflow — and a delay or wrong denial is a cash-flow problem. But even practices outside those states should pay attention:
- It’s a six-year pilot. WISeR is scheduled to run through 2031, and CMS has signaled it could expand to more services or regions.
- Medicare Advantage already does this. The same AI-assisted review is spreading across MA and commercial plans, so the lessons apply broadly.
- Denials are expensive to work. Every wrongly denied authorization means staff time, appeals, rescheduled patients — and some services that never get done. See our Denial Prevention Playbook.
- Documentation is your defense. When a human reviewer looks at a complete record, approval odds go up. Weak notes give an algorithm nothing to approve.
05What to do now
- Check your exposure. List every service you bill to traditional Medicare in the six WISeR states and match it against the covered service list on the CMS model page.
- Submit early and completely. Send prior authorization requests as soon as the service is ordered, with notes, imaging and prior treatment history attached.
- Track every request. Log the submission date, tracking number and deadline. If a decision is late, escalate and document it.
- Ask for peer-to-peer review when a denial doesn’t match the clinical picture, and appeal promptly — Medicare redeterminations must be filed within 120 days. Our appeal guide covers each level.
- Tighten prior authorization workflows across all payers. Our guide to retro authorization explains why “we’ll get it after” rarely works.
- Watch your wound care billing closely. Skin substitutes are a target of both WISeR and federal enforcement. See our wound care billing guidelines.
06What we’re watching
Expect continued pressure from Congress, patient advocates and provider groups, more records from the ongoing FOIA case, and any CMS announcement about expanding the model. We’ll cover major developments in future issues.
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Frequently asked questions
Which states are in the WISeR Model?
Arizona, New Jersey, Ohio, Oklahoma, Texas and Washington. It applies to traditional (fee-for-service) Medicare, not Medicare Advantage.
Do I have to request prior authorization under WISeR?
For covered services in the model states, providers can submit a prior authorization request. If they don’t, the claim can be subject to pre-payment medical review, which can delay payment.
Can an AI deny my request on its own?
CMS says AI tools help review requests but licensed clinicians make final denial decisions. The released records suggest human review can change outcomes significantly, so asking for reconsideration is worthwhile.
Will WISeR expand to other states?
The pilot runs through 2031 and CMS has indicated it could expand its scope. No specific expansion has been announced.
What if a decision is late?
Document the submission date and tracking number, escalate through the vendor’s provider support process, and keep records. Late decisions were among the problems CMS raised with vendors.
Sources
- Tech Times: Medicare AI prior auth — CMS penalized four vendors (Oct 28, 2026)
- Georgetown CHIR: WISeR faces potential repeal following GAO determination
- U.S. Senate Roll Call Vote 199 on S.J.Res. 198 (July 16, 2026)
- Medicare Rights Center: New records on WISeR (Sept 24, 2026)
- Hall Render: DOJ’s $6.5 billion health care fraud takedown
Related resources
This newsletter summarizes publicly reported information as of November 2026 and is not legal or compliance advice. Program details can change — confirm requirements with CMS and your MAC.
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