601 MS-DRG: NON-MALIGNANT BREAST DISORDERS WITHOUT CC/MCC
MS-DRG 601 groups Medicare inpatient hospital stays for: NON-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 | 0.6017 |
| Relative Weight (10% Cap Applied) | 0.6017 |
| Geometric Mean Length of Stay | 2.3 days |
| Arithmetic Mean Length of Stay | 2.9 days |
| Post-Acute Transfer DRG | No |
| Special Pay Transfer DRG | No |
Defining Codes (FY2027)
93 diagnosis codes can drive assignment here: D49.3, I97.2, N60.01, N60.02, N60.09, N60.11, N60.12, N60.19, N60.21, N60.22, N60.29, N60.31 and 81 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 601 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 (93)
- D49.3 — Neoplasm of unspecified behavior of breast[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- I97.2 — Postmastectomy lymphedema syndrome[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- N60.01 — Solitary cyst of right breast[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- N60.02 — Solitary cyst of left breast[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- N60.09 — Solitary cyst of unspecified breast[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- N60.11 — Diffuse cystic mastopathy of right breast[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- N60.12 — Diffuse cystic mastopathy of left breast[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- N60.19 — Diffuse cystic mastopathy of unspecified breast[Grouper diagnosis]— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
- and 85 more
DRG family
- DRG 600 — NON-MALIGNANT BREAST DISORDERS WITH CC/MCC[DRG family]: “NON-MALIGNANT BREAST DISORDERS WITH CC/MCC — same CMS DRG family (600-601), split by severity.”— CMS MS-DRG Definitions Manual (DRG family 600-601) · 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 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 20, 2026 · All releases and sources