IPF PPS FY 2027 Final Rule: Update Per-Diem Rates by October 1
FR-2026-15588 finalizes FY 2027 IPF PPS per-diem base rates, wage index values, and outlier thresholds effective October 1, 2026.
Action required by
October 1, 2026
Review the Action Required section below and ensure your team has completed all compliance steps before this date.
The Centers for Medicare & Medicaid Services published FR-2026-15588, the FY 2027 Inpatient Psychiatric Facility Prospective Payment System (IPF PPS) Rate Update Final Rule, in the Federal Register on July 31, 2026, with an effective date of October 1, 2026. This is a Final Rule — not proposed — meaning all rate and policy changes are binding as of the start of Federal Fiscal Year 2027. The single most critical compliance implication: every IPF billing system must reflect the updated per-diem base rates, revised wage index values, and the new outlier threshold before the first claim with a discharge date on or after October 1, 2026 is submitted.
Regulatory Background
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Quick answers
Does the FY 2027 wage index update in FR-2026-15588 apply automatically through my MAC, or do I need to load new values manually?
The MAC applies the wage index at claim adjudication based on the IPF's provider record and CBSA assignment on file with CMS. However, your internal charge capture system, cost report forecasting tools, and any prospective payment estimators will not update automatically — you must manually load the FY 2027 wage index values from FR-2026-15588 into those systems before billing October 1, 2026 discharges. Confirm with your MAC that your CBSA assignment reflects any FY 2027 reclassifications before the go-live date.
What is the compliance risk if we submit FY 2027 IPF outlier claims before updating our cost-to-charge ratio inputs to the refined outlier methodology?
If your claims system or manual outlier calculation still uses the FY 2026 outlier threshold and cost-to-charge ratio parameters after October 1, 2026, claims may either understate outlier costs (resulting in underpayment and unrealized revenue) or overstate them (resulting in overpayment and recoupment liability under post-payment review). FR-2026-15588 refines the outlier methodology effective October 1, 2026; any outlier claim for a discharge on or after that date must be calculated under the new parameters. Calendar an internal audit of the first 30 days of FY 2027 outlier claims to catch miscalculations early.
Is the new standardized IPF patient assessment instrument required at every discharge starting October 1, 2026, or only for specific patient populations?
Based on FR-2026-15588, the standardized IPF patient assessment instrument is described as a discharge requirement — the source material does not identify a limited patient population carve-out. Treat it as applicable to all IPF discharges on or after October 1, 2026 until CMS sub-regulatory guidance specifies otherwise. Refer to the full text of FR-2026-15588 for the exact instrument specifications and any population-level exceptions.
Content summarized from publicly available federal publications including CMS, MAC contractors, and the Federal Register. CLV Intelligence is not affiliated with or endorsed by any government agency. This is not legal or medical advice.