Medicare expands ACO enrollment by adding nurse practitioners as assignment anchors
S. 3350 — ACO Assignment Improvement Act of 2025 · Filed by John Barrasso (R-WY) · 1 cosponsor · Introduced Dec 4, 2025 · Referred to committee
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What it does
This bill expands how Medicare assigns beneficiaries to Accountable Care Organizations (ACOs) by adding nurse practitioners, physician assistants, and clinical nurse specialists as eligible primary care providers for assignment purposes, starting in 2026. Currently, assignment is based on primary care from physicians; this change broadens the pool of providers whose patient relationships can anchor an ACO assignment, potentially allowing more beneficiaries to be assigned to ACOs and giving those providers a larger role in coordinating care.
Why we flagged it
The bill's operative mechanism is a straightforward amendment to the Medicare ACO assignment rule, expanding the set of qualifying primary care providers. It is a technical regulatory change, not a financial carve-out or deregulation, and it directly addresses the stated purpose of improving assignment methodology.
What the text implies
- Expanding ACO assignment based on non-physician providers may increase the volume of beneficiaries in ACO risk-sharing arrangements without corresponding expansion of quality oversight or beneficiary protections specific to non-physician-led care coordination.
- The bill does not specify how ACO performance incentives (shared savings, quality metrics) apply when assignment is anchored to a nurse practitioner, physician assistant, or clinical nurse specialist rather than a physician, creating potential ambiguity in accountability.
- Broadening the provider base for assignment may accelerate ACO growth in rural and underserved areas where non-physician providers are more prevalent, which could improve access but also concentrate Medicare payment risk in less-established care models.
- The effective date (January 1, 2026) is imminent; implementation may occur before CMS issues guidance on how non-physician-led ACOs will be monitored or how beneficiary protections will be enforced.
Section numbers refer to the bill text the analysis read — linked under Primary records below.
Who it affects
The bill may benefit beneficiaries by expanding access to coordinated care through ACOs and leveraging non-physician providers who often provide accessible primary care; however, it also expands ACO enrollment without explicit safeguards on quality, cost containment, or beneficiary choice, and shifts assignment authority to a broader set of providers whose performance under ACO incentives is not yet established.
Who stands to gain
- Accountable Care Organizations (ACOs)
- Nurse practitioners, physician assistants, and clinical nurse specialists (as expanded assignment an
- Healthcare systems and practices employing non-physician providers
Named in the bill
Centers for Medicare & Medicaid Services (CMS), Accountable Care Organizations (ACOs), Nurse practitioners, Physician assistants, Clinical nurse specialists, Social Security Act § 1899, Medicare shared savings program
Where it stands
1 cosponsor: 1 Democrats.
- Dec 4, 2025 — Introduced · Congress.gov: “Introduced in Senate”
- Dec 4, 2025 — Referred to Senate Committee on Finance · Congress.gov: “Read twice and referred to the Committee on Finance. (text: CR S8512)”
Dates and quoted wording are Congress.gov's action record; the timeline shows status changes, not every procedural step.
Money around this bill
8 lobbying clients named this bill on 11 disclosure filings across 2 quarters, Dec 2025 to Jun 2026. Those filings disclosed $1,899,936 in lobbying spend. A filing names 27 bills on average, so that figure is what each filing reported, not a share belonging to this bill.
More lobbying clients named this bill than 88% of bills with at least one filing.
John Barrasso, the sponsor, reported $408,500 in PAC receipts in the 2026 cycle.
- American Association of Nurse Practitioners — $950,000 on 2 filings
- National Association of Accountable Care Organizations — $276,869 on 2 filings
- American Nurses Association — $270,000 on 1 filing
- American Academy of Physician Associates — $160,000 on 1 filing
- American Association of Nurse Practitioners — $130,000 on 2 filings
Lobbying Disclosure Act filings through Jul 22, 2026. A filing shows who paid to lobby on a bill it names, not what changed.
How this was measured
Analysis — Quorum's AI read the bill text published by Congress.gov (611 characters) on Aug 13, 2026. Section numbers in the findings refer to that text, linked below; transparency and hidden-provision scores are compared against the median of 16,222 analysed bills.
Status and sponsors — Congress.gov's bill record — actions, committee referrals and cosponsors — loaded nightly. The timeline shows status changes, not every procedural action.
Money — Senate Lobbying Disclosure Act filings whose specific-issue field names this bill for quarters ending Dec 2025 to Jun 2026. A filing's amount is reported whole beside the median number of bills a filing names; it is never divided across them. PAC receipts are FEC-reported contributions to the sponsor's candidate committee in the 2026 cycle.
As of — lobbying records through Jul 22, 2026 · page rendered 2026-10-20.
“Medicare expands ACO enrollment by adding nurse practitioners as assignment anchors” QuorumCivic. https://share.quorumcivic.app/bill/119/s3350 Report an error
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