298 MS-DRG: CARDIAC ARREST, UNEXPLAINED WITHOUT CC/MCC
MS-DRG 298 groups Medicare inpatient hospital stays for: CARDIAC ARREST, UNEXPLAINED WITHOUT CC/MCC. This is a medical MS-DRG. It falls under MDC 05 (Diseases and Disorders of the Circulatory System).
Payment & Classification Data
Official CMS values from the FY2027 IPPS Final Rule Table 5.
| Major Diagnostic Category | MDC 05 — Diseases and Disorders of the Circulatory System |
| DRG Type | Medical |
| Severity Level | None |
| Relative Weight | 0.4946 |
| Relative Weight (10% Cap Applied) | 0.4946 |
| Geometric Mean Length of Stay | 1 days |
| Arithmetic Mean Length of Stay | 1 days |
| Post-Acute Transfer DRG | No |
| Special Pay Transfer DRG | No |
Defining Codes (FY2027)
3 diagnosis codes can drive assignment here: I46.2, I46.8, I46.9.
From the CMS MS-DRG Definitions Manual (Appendices B and E). Assignment also depends on severity, discharge status and the rest of the claim.
Contextual Map
Every relationship of 298 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.
Major Diagnostic Category
- MDC 05 — Diseases and Disorders of the Circulatory System[MDC]— CMS MS-DRG Definitions Manual · FY2027
Defining diagnoses
- I46.2 — Cardiac arrest due to underlying cardiac condition[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- I46.8 — Cardiac arrest due to other underlying condition[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- I46.9 — Cardiac arrest, cause unspecified[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
DRG family
- DRG 296 — CARDIAC ARREST, UNEXPLAINED WITH MCC[DRG family]: “CARDIAC ARREST, UNEXPLAINED WITH MCC — same CMS DRG family (296-298), split by severity.”— CMS MS-DRG Definitions Manual (DRG family 296-298) · FY2027
- DRG 297 — CARDIAC ARREST, UNEXPLAINED WITH CC[DRG family]: “CARDIAC ARREST, UNEXPLAINED WITH CC — same CMS DRG family (296-298), split by severity.”— CMS MS-DRG Definitions Manual (DRG family 296-298) · FY2027
Read from: CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v44. All data sources · How to read the labels · How MedCoder verifies its implementation
Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 20, 2026 · All releases and sources