AHA Coding Clinic® for HCPCS - 2026 Quarter 1; In This Issue
Medicare Inpatient Only List Update
With the publication of the Calendar Year (CY) 2026 Outpatient Prospective Payment System (OPPS) and Ambulatory Surgical Center (ASC) final rule, the Centers for Medicare & Medicaid Services (CMS) has recommitted to phasing out the Inpatient-Only (IPO) List through a structured three-year period. The IPO list historically identified services payable only in the inpatient setting, for Medicare recipients, due to their complexity, invasiveness, recovery needs, or resource intensity. The list functioned as a regulatory restriction for facility billing, limiting where hospitals and ASCs could report certain surgical procedures. As medical practice has evolved, CMS determined that many of...
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Article Overview
This article explains CMS’s multi-year plan to phase out the Medicare Inpatient-Only (IPO) List and summarizes how the CY 2026 OPPS/ASC final rule changes outpatient and ASC eligibility. It is aimed at hospital outpatient, ASC, and facility coding staff who need to understand the scope of the annual update, the broader policy direction through CY 2028, and the operational areas affected by the revisions. The article also discusses related topics such as status indicators, APC assignment, medical review considerations, and the expansion of the ASC Covered Procedures List.
Why This Topic Matters
The update affects where certain procedures may be reported, how facilities manage coding and billing workflows, and how staff track annual CMS changes across OPPS and ASC settings.
Article Sections
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Overview of the IPO list phase-out
Introduces CMS’s planned transition away from the Inpatient-Only List and explains the broader policy context for Medicare facility billing.
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CY 2026 changes to the IPO list and ASC-CPL
Summarizes the annual update affecting procedure eligibility under OPPS and the ASC Covered Procedures List, including the general scope of the revisions.
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Medical review and site-of-service considerations
Describes the temporary review environment during the transition and the operational impact of changing site-of-service status.
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Implications for facility and ASC coding workflows
Covers the coding, billing, and internal process areas most affected by the annual rule changes, including review of status indicators and APC assignment.
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Examples of procedures removed from the IPO list
Provides a sample table of procedures affected by the CY 2026 update and notes their general outpatient or ASC status outcomes.
What You Will Learn
- How CMS’s IPO list phase-out is structured over multiple years
- What types of annual OPPS and ASC updates are included in the final rule
- Which operational areas in facility coding are affected by the policy changes
- Why status indicators, APC assignment, and medical review remain important during the transition
- How the article frames the relationship between IPO removal and ASC-CPL expansion
Who Should Read This
- Hospital outpatient coders
- ASC coders
- Facility billing staff
- Revenue cycle teams
- Coding compliance staff
- Health information management professionals
Codes Discussed
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