599 MS-DRG: MALIGNANT BREAST DISORDERS WITHOUT CC/MCC
MS-DRG 599 groups Medicare inpatient hospital stays for: MALIGNANT BREAST DISORDERS WITHOUT CC/MCC. This is a medical MS-DRG. It falls under MDC 09 (Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast).
Payment & Classification Data
Official CMS values from the FY2027 IPPS Final Rule Table 5.
| Major Diagnostic Category | MDC 09 — Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast |
| DRG Type | Medical |
| Severity Level | None |
| Relative Weight | 0.6759 |
| Relative Weight (10% Cap Applied) | 0.6925 |
| Geometric Mean Length of Stay | 1.8 days |
| Arithmetic Mean Length of Stay | 2.2 days |
| Post-Acute Transfer DRG | No |
| Special Pay Transfer DRG | No |
Defining Codes (FY2027)
74 diagnosis codes can drive assignment here: C50.011, C50.012, C50.019, C50.021, C50.022, C50.029, C50.111, C50.112, C50.119, C50.121, C50.122, C50.129 and 62 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 599 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 09 — Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast[MDC]— CMS MS-DRG Definitions Manual · FY2027
Defining diagnoses (74)
- C50.011 — Malignant neoplasm of nipple and areola, right female breast[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- C50.012 — Malignant neoplasm of nipple and areola, left female breast[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- C50.019 — Malignant neoplasm of nipple and areola, unspecified female breast[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- C50.021 — Malignant neoplasm of nipple and areola, right male breast[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- C50.022 — Malignant neoplasm of nipple and areola, left male breast[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- C50.029 — Malignant neoplasm of nipple and areola, unspecified male breast[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- C50.111 — Malignant neoplasm of central portion of right female breast[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- C50.112 — Malignant neoplasm of central portion of left female breast[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- and 66 more
DRG family
- DRG 597 — MALIGNANT BREAST DISORDERS WITH MCC[DRG family]: “MALIGNANT BREAST DISORDERS WITH MCC — same CMS DRG family (597-599), split by severity.”— CMS MS-DRG Definitions Manual (DRG family 597-599) · FY2027
- DRG 598 — MALIGNANT BREAST DISORDERS WITH CC[DRG family]: “MALIGNANT BREAST DISORDERS WITH CC — same CMS DRG family (597-599), split by severity.”— CMS MS-DRG Definitions Manual (DRG family 597-599) · 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