S. 3350 · Where this bill is now
In committee
Introduced in the Senate, Dec 4, 2025
What this bill does
In plain words · AI-written from the official summaryExpands how Medicare assigns patients to care groups
Medicare uses accountable care organizations (ACOs)—groups of doctors and hospitals working together—to coordinate patient care and share savings when they spend less money. Right now, Medicare assigns patients to ACOs mainly based on primary care visits with physicians. This bill would expand that to also count visits with other practitioners like physician assistants, nurse practitioners, and clinical nurse specialists when deciding which ACO a patient belongs to.
How it affects you
If you're on Medicare, this could change which ACO you're assigned to, depending on which type of healthcare provider you see most often. The change may affect how your care is coordinated and which doctors and hospitals are considered your primary care team under the Medicare shared savings program.
Read the official summary (Introduced in Senate, Dec 4, 2025)
ACO Assignment Improvement Act of 2025
This bill establishes additional requirements for assigning Medicare fee-for-service beneficiaries to accountable care organizations (ACOs) under the Medicare shared savings program. Under current law, the program enables ACOs to receive payments for savings stemming from care coordination and management.
The bill requires the basis for assignment to reflect beneficiaries' utilization of not only primary care services provided by ACO physicians, but also those provided by other ACO practitioners—specifically, physician assistants, nurse practitioners, and clinical nurse specialists.
Written by AI (Claude) using only the official summary by the Congressional Research Service, the Library of Congress’s nonpartisan research staff. It can miss nuance, so check the official summary and the bill text for details.
1st SessionS. 3350
A BILL
ACO Assignment Improvement Act of 2025
Sponsor: Sen. John Barrasso (R-WY) · Introduced Dec 4, 2025 · Health · 1 version of the text
Sources: Congress.gov actions and votes · bill text from GovInfo · latest official action Dec 4, 2025: “Read twice and referred to the Committee on Finance. (text: CR S8512)”