26 categories, 189 billing codes — Separate inpatient payment grouping (not a procedure code set). Curated representative subset of ~189 commonly-referenced MS-DRGs across the 25 MDCs + Pre-MDC, NOT exhaustive of the full ~773 active DRGs in CMS FY2025 Table 5. DRG numbers/titles drawn from general industry knowledge, not verified against a live CMS source — validate against official CMS Table 5 before billing/payment use..