O.R. Procedures with Principal Diagnosis of Mental Illness
MDC 19 — Mental Diseases and Disorders
CMS publishes classification in the Definitions Manual and weights in Table 5 of the IPPS rule, one spreadsheet per year. These are the 9 versions this grouper supports.
| Version | Fiscal year | Effective | Relative weight |
|---|---|---|---|
| V44.0 | FY 2027 | 2026-10-01 | 3.6897 |
| V43.1 | FY 2026 (Apr-Sep) | 2026-04-01 | 3.8649 |
| V43.0 | FY 2026 (Oct-Mar) | 2025-10-01 | 3.8649 |
| V42.1 | FY 2025 (Apr-Sep) | 2025-04-01 | 3.9296 |
| V42.0 | FY 2025 (Oct-Mar) | 2024-10-01 | 3.9296 |
| V41.1 | FY 2024 (Apr-Sep) | 2024-04-01 | 3.7315 |
| V41.0 | FY 2024 (Oct-Mar) | 2023-10-01 | 3.7315 |
| V40.1 | FY 2023 (Apr-Sep) | 2023-04-01 | 3.1963 |
| V40.0 | FY 2023 (Oct-Mar) | 2022-10-01 | 3.1963 |
Range 3.1963 to 3.9296. A dash means the DRG did not exist in that version.
Relative weight is not payment: actual reimbursement also applies wage index, capital, DSH and IME adjustments, and outliers. Group an encounter to see which DRG it actually lands in.
Open the MS-DRG grouper