MS-DRG · FY 2027 v44.0
MS-DRG 999 – Ungroupable
An MS-DRG in Ungrouped (Other).
✓ Official CMS v44.0 dataset
ICD-10-CM
Qualifying Diagnosis Codes
Diagnosis codes do not drive assignment for this DRG. Cases group here from the ICD-10-PCS procedure list.
ICD-10-PCS
Procedure Codes
Procedure codes do not drive assignment for this DRG.
Frequently Asked Questions
What is MS-DRG 999?
MS-DRG 999 (Ungroupable) is a medicare severity DRG in Ungrouped (Other).
Source: CMS ICD-10 MS-DRG v44.0 Definitions Manual and the FY 2027 IPPS Final Rule (Table 5), effective October 1, 2026 through September 30, 2027. We publish the DRG assignments as CMS defines them and add the navigation, search, and code links.
