MS-DRG v44.0 · MDC PRE: Pre-MDC
999 — Ungroupable
Source: CMS MS-DRG v44.0 and FY2027 IPPS final rule. Page updated September 29, 2026.
- Relative weight
- —
- Geometric mean LOS
- —
- Arithmetic mean LOS
- —
- Type
- —
About MS-DRG 999
MS-DRG 999, Ungroupable, is a DRG in Pre-MDC under MS-DRG version 44.0, which applies to inpatient discharges from October 1, 2026 through September 30, 2027.
ICD-10-CM codes that group to DRG 999 (0)
This DRG is assigned by procedure, not by a diagnosis list.
Common questions about DRG 999
What is the relative weight of DRG 999?
- CMS doesn't publish a relative weight for DRG 999.
Is DRG 999 medical or surgical?
- DRG 999 isn't classified as medical or surgical.