CMS removes 637 more services from the inpatient only list and adds at least 619 procedures (618 in the rule summary, plus CPT 64629) to the ASC covered procedures list for CY 2027
Published November 8, 2026 · Coverage November 1–7, 2026, Pacific · Medium priority
In the second year of a three-year phase-out, CMS finalized removal of 637 services from the inpatient only (IPO) list for CY 2027, from the auditory, digestive, endocrine, female genital, hemic and lymphatic, integumentary, male genital, maternity care and delivery, mediastinum and diaphragm, respiratory and urinary families; 1,438 services had remained on the list. The remaining families, which include the neurological and cardiovascular families and solid organ, intestinal and islet cell transplants, are expected to come off for CY 2028. CMS added 618 of the removed procedures to the ambulatory surgical center (ASC) covered procedures list (CPL) plus CPT 64629 at commenters' request. CMS restated that procedures removed from the IPO list since January 1, 2021, are exempt from site-of-service claim denials, initial medical review contractor referrals to Recovery Audit Contractors (RACs) and RAC patient-status reviews until Medicare claims data for a single calendar year show the procedure performed more than 50 percent of the time on an outpatient basis; CMS also noted that the end of each procedure's exemption would be announced through rulemaking, so the threshold alone does not end it. CMS also restated that MA plans must follow the 2-midnight benchmark.
Background
The IPO list, established with the initial implementation of the outpatient prospective payment system in 2000, names procedures that Medicare pays only when furnished in the inpatient hospital setting under Medicare Part A. CMS finalized a 3-year elimination of the list in its CY 2021 rule, halted it in its CY 2022 rule, and in its CY 2026 rule again finalized elimination over three years, beginning by removing 285 mostly musculoskeletal procedures for CY 2026.
Who this affects
Hospitals (inpatient and outpatient surgery, utilization review, case management), ASCs, surgeons; Medicare Advantage interactions with inpatient admission decisions.
Why it matters
Utilization review and case management need updated procedure lists so the physician's inpatient versus outpatient decision is documented for newly removed procedures. Inference: expect more MA plan pressure toward outpatient status for these procedures; CMS treats MA as out of scope but restates the 2-midnight requirement. Chargemaster and scheduling systems need the new ambulatory payment classification (APC) and status indicator assignments.
Recommended action
- Download the Final Procedures Removed from the IPO List for CY 2027 and Final Additions to the List of ASC Covered Procedures for CY 2027 public use files and update UR screening tools
- Brief surgeons and UR staff on the 2-midnight review exemption for removed procedures
- Track MA denials for inpatient admissions involving newly removed procedures
Implementation playbook
- Obtain the code-level list of the 637 services and update inpatient-only edits, scheduling rules and authorization logic. Owner: Revenue Integrity and Utilization Management. Due: 2026-12-31, ahead of the January 1, 2027 effective date.
- Brief surgeons, physician advisors and case management on patient-status decisions for the removed procedures under the 2-midnight rule. Owner: Utilization Management. Due: 2026-12-31.
- Systems that own ambulatory surgical centers: update the covered procedures list. Owner: ASC Operations. Due: 2026-12-31.
- Review Medicare Advantage authorization and status practices against CMS's restatement that plans must follow the 2-midnight benchmark. Owner: Managed Care. Due: 2027-01-31.
Scope and timing
- Authority status
- Final
- Responsible owner
- Utilization Review / Case Management (primary); Revenue Cycle; Perioperative Services
- Publication date
- 2026-11-06
- Effective date
- 2027-01-01
- Other dates
- Remaining IPO services expected to be removed for CY 2028 (third and final phase)
Not established
Code-level IPO and ASC CPL lists not retrieved. ASC CPL removals (for example CPT 0967T) and G0681/G0683 additions noted in the text but not worked up. The 619 in the title is the rule summary's 618 plus CPT 64629; the rule also finalizes adding G0681 and G0683, so this entry does not state a complete total.
Sources
Complete edition and supplemental material
This article in the complete report →
Executive triage, source-coverage limitations, context and forward horizons remain in the complete report.
Read the entire Medicare & Medicaid Sweep report →