# 119-s-3350: ACO Assignment Improvement Act of 2025

119-s-3350, ACO Assignment Improvement Act of 2025, is a 119th Congress bill sponsored by Sen. Barrasso, John [R-WY] (R-WY); status introduced; PRIA reads it as touching household money (as of 2026-04-21).

- Canonical: https://policyrisk.com/legislation/119-s-3350
- As of: 2026-04-21
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Bill: 119-s-3350
- Congress: 119
- Title: ACO Assignment Improvement Act of 2025
- Status: introduced
- Introduced: 2025-12-04
- Sponsor: Sen. Barrasso, John [R-WY] (R-WY)
- Cosponsors: 1
- Policy area: Health
- Touches household money: yes
- Last recorded action: 2026-04-21

## Summary

**Expands which primary care services count when assigning Medicare beneficiaries to Accountable Care Organizations (ACOs).** The bill would add primary care services furnished by ACO professionals described in 1899(h)(1)(B) to the Medicare Shared Savings Program attribution rules for performance years beginning on or after January 1, 2026. - Accountable Care Organizations (ACOs): Would see a broader set of primary care activity used to link beneficiaries to an ACO. That could change which patients are attributed to an ACO starting with the 2026 performance year. - Primary care professionals defined in 1899(h)(1)(B): Their primary care visits would count toward MSSP beneficiary assignment. Those services could influence which ACO gets credit for a patient. - Medicare beneficiaries: Some people could be attributed to different ACOs because more types of primary care services count toward assignment. The change applies to performance years beginning January 1, 2026. - Program administrators: The revision operates within the existing MSSP and Title XVIII framework and adjusts only the attribution basis for beneficiaries.

## Cosponsors (1)

- Sen. Whitehouse, Sheldon [D-RI] (D-RI), 2025-12-04T00:00:00.000Z

## Provisions PRIA read

- Medicare ACO assignment adds primary care: benefit, low. If enacted, this bill would change how Medicare assigns people to Accountable Care Organizations (ACOs). It would add primary care services furnished under title XVIII (Medicare) by ACO professionals described in subsection (h)(1)(B) to the Medicare Shared Savings Program assignment rules. This wou…

## Related bills

- 119-s-4949: Water Resources Development Act of 2026
- 119-s-1748: Kids Online Safety Act
- 119-s-2287: Palliative Care and Hospice Education and Training Act
- 119-s-5025: Lindsey O. Graham Sanctioning Russia Act of 2026
- 119-s-2461: Promotion and Expansion of Private Employee Ownership Act of 2025
- 119-s-1241: Sanctioning Russia Act of 2025

## Sources
- [119-s-3350 on Congress.gov](https://www.congress.gov/bill/119th-congress/senate-bill/3350)

## Related
- [119-s-4949: Water Resources Development Act of 2026](https://policyrisk.com/legislation/119-s-4949)
- [119-s-1748: Kids Online Safety Act](https://policyrisk.com/legislation/119-s-1748)
- [119-s-2287: Palliative Care and Hospice Education and Training Act](https://policyrisk.com/legislation/119-s-2287)
- [119-s-5025: Lindsey O. Graham Sanctioning Russia Act of 2026](https://policyrisk.com/legislation/119-s-5025)
- [119-s-2461: Promotion and Expansion of Private Employee Ownership Act of 2025](https://policyrisk.com/legislation/119-s-2461)
- [119-s-1241: Sanctioning Russia Act of 2025](https://policyrisk.com/legislation/119-s-1241)
- [All bills in Congress](https://policyrisk.com/legislation)

Source: PRIA, https://policyrisk.com/legislation/119-s-3350 (as of 2026-04-21).