CMS published the FY 2027 Inpatient Rehabilitation Facility Prospective Payment System final rule (CMS-1845-F) in the Federal Register on August 3, 2026, and it takes effect for Medicare discharges beginning October 1, 2026. On the surface it looks like a routine annual update — a modest payment increase and refreshed case-mix tables. But buried in the rule are two revised conditions of Medicare coverage, a major compression of quality reporting deadlines, and a strong signal about where IRF payment policy is headed next. Here is what health information management and rehab leaders should know.
The payment picture: a 2.3% update with a friendlier outlier threshold
CMS finalized a net 2.3% payment update for FY 2027, reflecting a 3.2% market basket increase reduced by a 0.9 percentage point productivity adjustment. The standard payment conversion factor rises to $19,868, and CMS estimates the average overall increase in IRF payments at approximately 2.7% once all provisions are accounted for.
The quieter but meaningful change is the high-cost outlier threshold, which drops from $10,141 to $8,857. A lower threshold means more medically complex cases will qualify for outlier payments in FY 2027. For facilities, that raises the stakes on complete, accurate coding: outlier eligibility is calculated from the costs and the case-mix group assignment on each claim, so undercoded comorbidities leave money on the table twice — once in tier assignment, and again at the outlier margin.
As always, the CMG relative weights and average length-of-stay values were updated in a budget-neutral manner. The ALOS values matter beyond payment modeling: they determine when a discharge meets the definition of a short-stay transfer, which triggers a per-diem payment adjustment. Coding and billing teams should have the new tables loaded before the first FY 2027 discharge.
The 36-hour rule now unambiguously means all therapies
The most consequential compliance change in the rule is a revision to 42 CFR 412.622(a)(3)(ii). Effective October 1, 2026, all therapy treatments and/or therapy evaluations ordered at admission must begin no later than 36 hours from midnight following the day of admission — not just the first therapy discipline.
CMS acknowledges that outdated 2010 sub-regulatory guidance created ambiguity about whether one therapy or all therapies had to start within the window. The final rule closes that door. A patient admitted Tuesday at 2:00 p.m. must have every ordered therapy initiated by Thursday at 12:00 p.m.
- Therapy evaluations count as initiation, so a completed PT, OT, or SLP evaluation within the window satisfies the requirement for that discipline.
- Therapies ordered later in the stay are outside the requirement — the 36-hour clock applies to therapies ordered at admission through the preadmission screening and physician concurrence.
- CMS declined to add flexibilities for staffing shortages, despite extensive comment. Claims that miss the window fail the "reasonable and necessary" standard, and compliance will be assessed through medical record audits.
Initial IDT meetings move to day 4
CMS also finalized a revision to the interdisciplinary team meeting requirement at 412.622(a)(5)(ii). The first IDT meeting must now occur on or before the fourth day of admission, with the day of admission counting as day 1 — so a patient admitted Thursday needs an initial IDT meeting by Sunday at 11:59 p.m. Subsequent meetings must occur within 7 days of the prior meeting.
CMS clarified that IDT documentation must be maintained separately from the plan-of-care documentation, and that only the rehabilitation physician may participate remotely — all other team members must attend in person. Facilities whose IDT meetings run on a fixed weekly schedule will likely need a second weekly meeting slot to stay compliant for patients admitted mid-cycle.
What CMS did not finalize
Two proposals from April's proposed rule did not survive:
- Current functional status in the preadmission screening. CMS withdrew its proposal to require documentation of the patient's current functional status in the PAS after commenters raised concerns about compliance risk and assessment methodology. PAS requirements are unchanged for now, though CMS signaled it may return with a more specific proposal.
- A midnight-based IDT deadline. The finalized IDT requirement runs from the date of admission, not from midnight — a small but meaningful clarification for anyone building compliance timelines.
Quality reporting deadlines are shrinking to 45 days
Beginning with the FY 2029 IRF QRP — which covers data collected starting January 2027 — IRF-PAI assessment data and CDC NHSN measure data, including corrections, will be due by the 15th day of the second month after the end of each calendar quarter. That is roughly 45 days, down from the current 4.5 months.
CMS's own analysis shows over 99% of IRF-PAI assessments are already submitted within 45 days, so the initial submission is rarely the problem. The real operational change is the correction window: the months of runway facilities currently have to review, correct, and resubmit assessment data collapses to weeks. The first shortened deadline arrives in mid-May 2027 for Q1 2027 data. IRFs that treat IRF-PAI completion as a back-burner reconciliation task will feel this one.
The bigger signal: IRF payment reform is coming
Tucked into the rule is a request for information on modernizing the IRF PPS by adapting the clinical classification and comorbidity score methodology used in the Skilled Nursing Facility Patient-Driven Payment Model (PDPM). CMS is openly exploring whether to restructure how IRF patients are grouped for payment.
Anyone who lived through the SNF transition to PDPM in 2019 knows what that kind of change means for coding and documentation operations: diagnosis coding moves from a supporting role to the primary payment driver. Nothing is finalized — this was comment-gathering only — but IRFs should read it as a clear directional signal. Facilities with disciplined, audit-ready ICD-10-CM coding practices will be positioned to adapt; facilities without them will be playing catch-up under a compressed timeline.
What IRFs should be doing now
Before October 1: load the FY 2027 CMG relative weights, ALOS values, and annual ICD-10-CM updates; confirm therapy start times and IDT meeting dates are captured cleanly and consistently in the medical record; and brief scheduling and therapy leadership on the all-therapies reading of the 36-hour rule.
Before January 2027: map your IRF-PAI completion and correction workflow against a 45-day quarterly cycle, and close the gaps while there is still slack in the schedule.
CODEMED, Inc. has provided medical coding, cancer registry, and revenue cycle services to hospitals and health systems for more than 27 years, including inpatient rehabilitation facility coding and IRF-PAI support. If your facility is preparing for the FY 2027 changes, contact us to talk about how we can help.
This article summarizes the FY 2027 IRF PPS Final Rule (91 FR 48982, Aug. 3, 2026) for general informational purposes and is not legal, compliance, or clinical advice.