306 MS-DRG: CARDIAC CONGENITAL AND VALVULAR DISORDERS WITH MCC
MS-DRG 306 groups Medicare inpatient hospital stays for: CARDIAC CONGENITAL AND VALVULAR DISORDERS WITH 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 | MCC |
| Relative Weight | 1.546 |
| Relative Weight (10% Cap Applied) | 1.546 |
| Geometric Mean Length of Stay | 3.8 days |
| Arithmetic Mean Length of Stay | 5.2 days |
| Post-Acute Transfer DRG | No |
| Special Pay Transfer DRG | No |
Defining Codes (FY2027)
146 diagnosis codes can drive assignment here: A52.01, A52.02, B33.21, I01.1, I05.0, I05.1, I05.2, I05.8, I05.9, I06.0, I06.1, I06.2 and 134 more.
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 306 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 (146)
- A52.01 — Syphilitic aneurysm of aorta[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- A52.02 — Syphilitic aortitis[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- B33.21 — Viral endocarditis[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- I01.1 — Acute rheumatic endocarditis[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- I05.0 — Rheumatic mitral stenosis[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- I05.1 — Rheumatic mitral insufficiency[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- I05.2 — Rheumatic mitral stenosis with insufficiency[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- I05.8 — Other rheumatic mitral valve diseases[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- and 138 more
DRG family
- DRG 307 — CARDIAC CONGENITAL AND VALVULAR DISORDERS WITHOUT MCC[DRG family]: “CARDIAC CONGENITAL AND VALVULAR DISORDERS WITHOUT MCC — same CMS DRG family (306-307), split by severity.”— CMS MS-DRG Definitions Manual (DRG family 306-307) · 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 28, 2026 · All releases and sources