MS-DRG · FY 2026 v43.0

MS-DRG 90 – Concussion without CC/MCC

A Medical DRG in MDC 01 (Diseases & Disorders of the Nervous System). Inpatient cases group to DRG 90 when the ICD-10-CM principal diagnosis is one of the 4 codes listed below and no secondary diagnosis on the CC or MCC lists is present. Its FY 2026 relative weight is 0.8232 with a geometric mean length of stay of 1.9 days.

Medical DRG – assigned by principal diagnosis✓ Official CMS v43.0 dataset
0.8232
Relative Weight
1.9
Geometric Mean LOS (days)
2.3
Arithmetic Mean LOS (days)
4
Principal Diagnosis Codes

Severity family

DRG 88with MCCWeight 1.3518 · GMLOS 3.4 daysDRG 89with CCWeight 1.0986 · GMLOS 2.5 daysDRG 90without CC/MCCWeight 0.8232 · GMLOS 1.9 days
How a case is assigned to DRG 90

The grouper first assigns the case to MDC 01 from the principal diagnosis and finds no qualifying operating-room procedure (this is a Medical DRG; ICD-10-PCS codes do not drive assignment here), then applies the severity split from secondary diagnoses: with MCC → 88; with CC → 89; without CC/MCC → 90.

ICD-10-CM

Principal Diagnosis Codes 4 codes · 1 category

S06 Intracranial injury4 codes
  • S06.0X0A Concussion without loss of consciousness, initial encounter
  • S06.0X1A Concussion with loss of consciousness of 30 minutes or less, initial encounter
  • S06.0X9A Concussion with loss of consciousness of unspecified duration, initial encounter
  • S06.0XAA Concussion with loss of consciousness status unknown, initial encounter
ICD-10-PCS

Procedure Codes

Procedure codes do not drive assignment for this DRG. DRG 90 is a Medical DRG, assigned from the principal diagnosis above.

Frequently Asked Questions

What is MS-DRG 90?

MS-DRG 90 (Concussion without CC/MCC) is a medical DRG in MDC 01 (Diseases & Disorders of the Nervous System). Its FY 2026 relative weight is 0.8232 with a geometric mean length of stay of 1.9 days.

What is the difference between DRG 88, 89, 90?

All 3 share the same base category; the severity of secondary diagnoses separates them: 88 (with MCC), 89 (with CC), 90 (without CC/MCC). A major complication or comorbidity (MCC) places the case in the highest-weighted DRG of the family; a CC in the middle; neither in the lowest.

How many diagnosis codes group to DRG 90?

4 ICD-10-CM principal diagnosis codes group to this DRG, spanning 1 three-character category.

What is the relative weight of DRG 90?

The FY 2026 relative weight of this DRG is 0.8232, meaning reimbursement of roughly 0.82 times the average Medicare inpatient case. Multiply by a hospital's blended base rate for the approximate payment.

← PreviousDRG 89 – Concussion with CC
Source: CMS ICD-10 MS-DRG v43.0 Definitions Manual and the FY 2026 IPPS Final Rule (Table 5), effective October 1, 2025 through September 30, 2026. We publish the DRG assignments as CMS defines them and add the navigation, search, and code links.