MS-DRG 091Medical

Other Disorders of Nervous System with MCC

Major Diagnostic Category 01·Grouped by diagnosis·FY 2027

MS-DRG 091 is a Medical Medicare Severity Diagnosis Related Group under Major Diagnostic Category 01 (MDC 01) with a Major Complication or Comorbidity (MCC). It maps to 771 ICD-10-CM diagnosis codes. For FY 2027 it carries a relative weight of 1.7046 with a geometric mean length of stay of 4.3 days and an arithmetic mean of 6.1 days. Hospitals use this grouping to determine reimbursement for inpatient stays under Medicare.

FY 2027 payment data

From Table 5 of the FY 2027 IPPS Final Rule (CMS).

Relative weight:: 1.7046 (payment multiplier vs. the average case (1.0))
Geometric mean stay:: 4.3 days (used for transfer payments)
Average stay:: 6.1 days (arithmetic mean)
Post-acute transfer policy:: Yes (early transfers can be paid less)

Same condition, other severity levels

CMS splits one condition into separate DRGs by how sick the patient is. With MCC pays more than with CC, which pays more than without CC/MCC.

DRG	Title	Relative weight	Mean stay
091	Other Disorders of Nervous System with MCC (this page)	1.7046	4.3 days
092	Other Disorders of Nervous System with CC	1.0239	3 days
093	Other Disorders of Nervous System without CC/MCC	0.7783	2.2 days

Diagnosis codes (771)

As the principal diagnosis, these ICD-10-CM codes can group to DRG 091. 100% of the codes listed are billable.