Republicans block bill to end Medicare AI prior-authorization pilot

A Senate vote on Thursday failed to halt a Medicare pilot that uses artificial intelligence to approve or deny care. The measure, backed by Democrats, was rejected by a 46‑to‑50 vote, with Republicans opposing the effort to stop the program.

The pilot, known as WISeR, allows the use of AI in prior authorization decisions within original Medicare, a setting where such requirements are rarely applied. Medicare officials have highlighted potential benefits of the test, distributing informational handouts to lawmakers.

The vote reflects broader partisan disagreement over the role of AI and prior authorization in the Medicare system. While Republicans sought to rein in prior‑authorization practices, the administration and Democratic supporters argue the AI tool could improve efficiency and consistency in care decisions.