MS-DRG · FY 2026 v43.0

MS-DRG 298 – Cardiac Arrest, Unexplained without CC/MCC

A Medical DRG in MDC 05 (Diseases & Disorders of the Circulatory System). Inpatient cases group to DRG 298 when the ICD-10-CM principal diagnosis is one of the 3 codes listed below and no secondary diagnosis on the CC or MCC lists is present. Its FY 2026 relative weight is 0.4551 with a geometric mean length of stay of 1.1 days.

Medical DRG – assigned by principal diagnosis✓ Official CMS v43.0 dataset
0.4551
Relative Weight
1.1
Geometric Mean LOS (days)
1.2
Arithmetic Mean LOS (days)
3
Principal Diagnosis Codes

Severity family

DRG 296with MCCWeight 1.5619 · GMLOS 2.0 daysDRG 297with CCWeight 0.6235 · GMLOS 1.3 daysDRG 298without CC/MCCWeight 0.4551 · GMLOS 1.1 days
How a case is assigned to DRG 298

The grouper first assigns the case to MDC 05 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 → 296; with CC → 297; without CC/MCC → 298.

ICD-10-CM

Principal Diagnosis Codes 3 codes · 1 category

I46 Cardiac arrest3 codes
  • I46.2 Cardiac arrest due to underlying cardiac condition
  • I46.8 Cardiac arrest due to other underlying condition
  • I46.9 Cardiac arrest, cause unspecified
ICD-10-PCS

Procedure Codes

Procedure codes do not drive assignment for this DRG. DRG 298 is a Medical DRG, assigned from the principal diagnosis above.

Frequently Asked Questions

What is MS-DRG 298?

MS-DRG 298 (Cardiac Arrest, Unexplained without CC/MCC) is a medical DRG in MDC 05 (Diseases & Disorders of the Circulatory System). Its FY 2026 relative weight is 0.4551 with a geometric mean length of stay of 1.1 days.

What is the difference between DRG 296, 297, 298?

All 3 share the same base category; the severity of secondary diagnoses separates them: 296 (with MCC), 297 (with CC), 298 (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 298?

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

What is the relative weight of DRG 298?

The FY 2026 relative weight of this DRG is 0.4551, meaning reimbursement of roughly 0.46 times the average Medicare inpatient case. Multiply by a hospital's blended base rate for the approximate payment.

← PreviousDRG 297 – Cardiac Arrest, Unexplained 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.