Medicare's AI prior authorization pilot is under fire, and it runs through 2031
Denials contradicting medical records, 100 patients queued for injections, and reimbursements at quadruple the promised turnaround. The weekend's scrutiny of WISeR is a deployment eval in public.
- Weekend scrutiny of Medicare's WISeR AI prior authorization pilot intensified, with Ars Technica publishing an in-depth examination Saturday night after Senate Republicans blocked a halt effort 46 to 50 on Thursday.
- WISeR launched January 1 in six states and runs through 2031, applying AI assisted review to services like nerve stimulator implants, knee arthroscopy, and epidurals.
- KFF Health News documented roughly 100 patients waiting for epidurals at one hospital, 6 to 8 week reimbursement delays against a promised 15 days, and denials that contradicted medical records.
The largest consequential-decision AI deployment in American government is being evaluated in public, and the grades are rough. Scrutiny of WISeR, the Medicare pilot that uses an AI algorithm to help approve or deny certain claims, intensified over the weekend with an in-depth Ars Technica examination published Saturday night, days after Senate Republicans blocked a Democratic-led measure to halt the program, 46 to 50 along party lines on Thursday, per STAT.
WISeR, the Wasteful and Inappropriate Service Reduction Model run by the CMS Innovation Center, launched January 1 in six states: New Jersey, Ohio, Oklahoma, Texas, Arizona, and Washington. It runs six performance years through December 31, 2031, applying AI assisted prior authorization to services including skin substitutes, electrical nerve stimulator implants, knee arthroscopy, epidurals, and kyphoplasty.
The failure modes, documented
KFF Health News and CBS News reporting documented a rocky rollout: roughly 100 patients waiting for epidural injections at the University of Washington, reimbursement delays of 6 to 8 weeks against a promised 15 days, and denials that contradicted the medical records they were supposedly based on. Phoenix pain physician Jerry Sobel called the experience "horrendous," per KFF. CMS Innovation Center director Abe Sutton has defended the model as keeping prior authorization "efficient, fast, and streamlined," and the White House opposed the Senate measure, with CMS circulating pro-WISeR material to lawmakers, per STAT.
A deployment eval with no rubric
This desk usually covers evals that happen before deployment, from agent safety benchmarks to models shipping past their own thresholds. WISeR inverts the order: a system making medical necessity judgments at population scale, with error reports arriving via journalism instead of monitoring dashboards, and a six-year runway locked in. Whatever the model's true error rate is, nobody outside CMS can currently compute it. For a program whose failure mode is a denied epidural, that is the finding.