Steven Lee Corso

What CMS’s 2026 Hospital Outpatient Payment Rule Means for Patients and Health Systems - Brian “Weence” Bateman What changed—and why it matters Beginning January 1, 2026, Medicare will pay hospitals and ambulatory surgery centers (ASCs) under updated rules finalized by the Centers for Medicare & Medicaid Services (CMS). The annual Hospital Outpatient Prospective Payment System (OPPS) and ASC rule sets how much Medicare pays for thousands of outpatient services—from imaging tests and chemotherapy infusions to minor surgical procedures. For patients, the key point is this: most Medicare beneficiaries pay 20% coinsurance under Part B for outpatient services. So when Medicare’s allowed payment amount changes, your out-of-pocket cost can change, too. The 2026 rule also continues broader policy shifts that may influence where care is delivered—hospital outpatient department, ambulatory surgery center, or physician office. 1. What the 2026 OPPS/ASC rule covers The OPPS applies to services provided in hospital outpatient departments. The ASC payment system applies to procedures performed in Medicare-certified ambulatory surgery centers—freestanding facilities that perform same-day surgeries. Each year, CMS updates payment rates, quality reporting requirements, and certain coverage or billing policies. According to the CMS CY 2026 OPPS/ASC Final Rule Fact Sheet, the changes take effect January 1, 2026 and apply nationwide. 2. Payment rate updates: how Medicare sets outpatient payments Under OPPS, CMS assigns services to payment groups called Ambulatory Payment Classifications (APCs). Each APC has a relative weight based on the typical resources required to provide that service. CMS then applies a conversion factor—updated annually—to determine the dollar payment amount. The ASC system uses a related methodology tied in part to hospital outpatient rates. For 2026, CMS finalized an overall payment update for hospital outpatient departments and ASCs, reflecting statutory formulas and adjustments for inflation and productivity. CMS calculates these updates using a hospital market basket index (which estimates changes in the costs of goods and services hospitals purchase) and applies required productivity adjustments. What this means in practical terms: some outpatient services will see modest increases in Medicare’s allowed payment amounts, while others may remain flat or shift based on reclassification or updated cost data. Importantly, Medicare payment increases do not automatically mean your bill goes up. Your coinsurance is typically 20% of Medicare’s allowed amount for a given service under Part B. If the allowed amount rises, coinsurance may rise slightly; if it falls, coinsurance may fall. Supplemental coverage (such as Medigap or employer retiree plans) may cover some or all of that cost-sharing. 3. Site-neutral payment policies: where care happens “Site-neutral” payment policies aim to reduce differen