CMS is expected to release its fiscal year 2027 hospital inpatient final rule within days. The proposed version (CMS-1849-P), issued April 10, 2026, set a net 2.4% payment update for acute-care hospitals: a 3.2% market basket increase cut by a 0.8-point productivity adjustment, worth about $1.9 billion more than FY2026 (CMS fact sheet; AHA summary). The comment period closed June 9, and last year’s FY2026 final rule landed July 31, so a late-July or early-August release fits the calendar.
The trade press reads this as a hospital-margin story. For workers’ compensation self-insureds, it is a severity story.
Who it affects
Roughly three-quarters of states with inpatient hospital price regulation set their workers’ comp maximums off Medicare’s diagnosis-related group (DRG) system, per the Workers Compensation Research Institute (WCRI). Many peg reimbursement to a fixed percentage of the Medicare DRG rate. When CMS lifts the DRG base rate 2.4%, the workers’ comp allowed amount in those states moves with it, mechanically, on the rule’s effective date.
That hits self-insured employers and public entities with construction, manufacturing, transportation, and heavy-industry payrolls, the exposures that generate surgical and trauma admissions. A back fusion, a crush injury, a burn: these are the inpatient claims where the DRG base rate does the work.
The reserve mechanism
The lever is severity on the inpatient slice of workers’ comp medical, and it is a base-rate reset, not a trend estimate. In a percent-of-Medicare state, a 2.4% DRG update lifts the per-admission benchmark by roughly that much overnight for admissions on or after the effective date. It does not fade in like wage inflation; it steps.
Two features sharpen the point. First, market basket rebasing to a 2023 base year changes the mix of cost weights feeding the update, so the transmission is not perfectly uniform across DRGs. Second, CMS proposed about $464 million in new-technology add-on payments layered on top of the base rate. Those add-ons attach to the highest-cost admissions, the exact claims that drive the tail on a workers’ comp medical triangle. The base rate is what buyers watch; the add-on is what quietly moves the long end.
Keep this rule separate from the CMS outpatient rule. The FY2027 IPPS governs inpatient DRGs; the calendar-year OPPS rule resets the outpatient and ambulatory-surgery fee schedules that many states also tie to Medicare. They move on different clocks and hit different rows of your medical trend. We covered the outpatient channel in the CMS 2027 OPPS site-neutral piece.
Where this shows up in your reserves
Look at the inpatient hospital line of your medical development, split by state of jurisdiction. In percent-of-Medicare states, paid severity per inpatient admission should step up on the effective date for new admissions; if your trend assumption blends inpatient and outpatient into one factor, that step gets smeared and understated. On the workers’ comp IBNR side, the add-on payments show up in the large-claim tail, so check your excess-of-severity layers, not just the mean.
What this means for your next review
Ask your actuary to confirm the medical trend separates inpatient (DRG-linked) severity from outpatient (OPPS-linked) severity, and to state how fast an IPPS update flows into open inpatient case reserves in your percent-of-Medicare states. If you are a self-insured hospital, the same margin and staffing pressure that the rule signals is a leading frequency indicator for hospital professional liability, worth flagging to whoever owns that HPL reserve.
Watch the final number against the 2.4% proposal, and any change to the new-technology add-on total. The base-rate line is the headline; the add-on line is where the tail sits.