Regulation Resources

ACOs are impacted by a number of regulations governing care delivery and payment. The annual Medicare Physician Fee Schedule (MPFS) Rule includes numerous policies affecting Medicare physician payment and changes to the Medicare Shared Savings Program (MSSP). This webpage also includes resources on key regulatory issues for ACOs, including telehealth, COVID-19 and the public health emergency (PHE), health IT and data, and substance use disorder.

Check out NAACOS’ member resources on the 2025 Federal government shutdown.

Medicare Physician Fee Schedule

NAACOS member resources

NAACOS public resources

CMS resources

2026

Final Rule:

Proposed Rule:

Comments: Proposed Rule (09/25)

Physician Fee Schedule: CY 2026 Proposed Rule

2025

Final Rule:
Proposed 2025 MPFS Rule

2024

Final Rule:

Statement: Final rule (11/23)
Comments: Proposed rule (09/23)

Final 2024 MPFS Rule

2023

Final Rule:

Webinar: Proposed financial methodology changes for MSSP (07/22)
ACO Guide: Quality Payment Program (MACRA implementation)

Statement: Final rule (11/22)
Comments: Proposed rule (09/22)

Final 2023 MPFS Rule

2022

Final Rule:

Statement: Final rule (11/21)
Comments: Proposed rule (09/21)

Final 2022 MPFS Rule

2021

Final Rule:

Statement: Final rule (12/20)
Comments: Proposed rule (09/20)

Final 2021 MPFS Rule

Other Regulatory Issues

NAACOS member resources

NAACOS public resources

Federal resources

Health Technology Ecosystem

HTI-5 Proposed Rule (01/26)


Health Data Technology, and Interoperability (HTI-2, HTI-3, and HTI-4) Rules_HTI-2 Update (01/26)


Information Blocking for ACOs (08/24)


Coalition letter to CMS: Repeal new PI requirements (04/24)


Health IT “Information Blocking” Rules: What ACOs Need to Know (11/23)


Information Blocking Disincentives proposed rule (01/24)


Summary: Interoperability and Prior Authorization final rule (01/24)

Coalition Letter to CMS: Repeal Promoting Interoperability Requirements (04/24)

Final rule: ONC certification program updates Final rule: ADT notification

FAQs: CMS Waivers, Flexibilities, and the End of the COVID-19 PHE (05/23)
MSSP: CMS Flexibilities to Fight COVID-19 (02/23)

Behavioral Health

Comments: HIPAA and Part 2 parity proposed rule (01/23)

Proposed rule: HIPAA and Part 2 parity (12/22)

Inpatient Hospital & Post-Acute Care

FY 2026 Hospital Inpatient Prospective Payment (IPPS) and Long-Term Care Hospital (LTCH) Prospective Payment Systems (8/25)

The “Transforming Episode Accountability Model” (TEAM) (8/25)

Price Transparency Requirements for Hospitals to Make Standard Charges Public (7/25)

Comments: FY2026 Inpatient Prospective Payment Systems Proposed Rule (06/25)
Comments: Proposed Transforming Episode Accountability Model (06/24)

Acute Inpatient PPS Home Page

Long-Term Care Hospital PPS Home Page

Skilled Nursing Facility PPS Home Page

FY 2026 IPPS and LTCH PPS Final Rule Fact Sheet

FY 2026 IPPS Proposed Rule Home Page

Outpatient Hospital

A Summary of the CY 2026 Hospital Outpatient Prospective Payment System (OPPS) and Ambulatory Surgery Center (ASC) Payment System Proposed Rule (7/25)

Hospital Outpatient PPS Rule Home Page

Medicare Advantage

2026 NAACOS Resources:

2025 NAACOS Resources:

  • CY27 MA Proposed Rule Summary (11/25)
  • CY26 MA Final Rule: Summary (4/25)
  • CY26 Rate Announcement: Summary (4/25)
  • CY26 MA Advance Notice Summary (01/25)

2024 NAACOS Resources:

  • CY26 MA Proposed Rule: Summary (11/24)

Other MA resources:

Contract Year (CY) 2026 Policy and Technical Changes to the Medicare Advantage (MA) and Prescription Drug Benefit Programs (4/25)

Contract Year (CY) 2025 Policy and Technical Changes to the Medicare Advantage and Medicare Prescription Drug Benefit Programs (4/24)

CY 2024 Policy And Technical Changes To The Medicare Advantage And Prescription Drug Benefit Programs (4/23)

Comments: Unleashing Prosperity Through Deregulation of the Medicare Program RFI (1/26)

Comments: CY2027 Medicare Advantage and Part D Proposed Rule (1/26)

Comments: CY2026 Medicare Advantage and Part D Proposed Rule (1/25)

NAACOS responds to CMS’s request for information on improving the data collection and transparency of Medicare Advantage Data (05/24)

Comments: Medicare Advantage risk adjustment proposed rule (03/23) 

CY27 MA Proposed Rule

CY26 MA Final Rule

CY26 Rate Announcement:

CY26 MA Advance Notice: