All ICD10 Codes
MS-DRG 599Medical

Malignant Breast Disorders without CC/MCC

Major Diagnostic Category 09·Grouped by diagnosis·FY 2027

MS-DRG 599 is a Medical Medicare Severity Diagnosis Related Group under Major Diagnostic Category 09 (MDC 09) without a significant Complication or Comorbidity. It maps to 74 ICD-10-CM diagnosis codes. For FY 2027 it carries a relative weight of 0.6925 with a geometric mean length of stay of 1.8 days and an arithmetic mean of 2.2 days. Hospitals use this grouping to determine reimbursement for inpatient stays under Medicare.

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FY 2027 payment data

From Table 5 of the FY 2027 IPPS Final Rule (CMS).

Relative weight:
0.6925 (payment multiplier vs. the average case (1.0))
Geometric mean stay:
1.8 days (used for transfer payments)
Average stay:
2.2 days (arithmetic mean)
Post-acute transfer policy:
No (not subject to it)

Same condition, other severity levels

CMS splits one condition into separate DRGs by how sick the patient is. With MCC pays more than with CC, which pays more than without CC/MCC.

DRGTitleRelative weightMean stay
597Malignant Breast Disorders with MCC1.73834.8 days
598Malignant Breast Disorders with CC1.09623.3 days
599Malignant Breast Disorders without CC/MCC (this page)0.69251.8 days

Diagnosis codes (74)

As the principal diagnosis, these ICD-10-CM codes can group to DRG 599. 100% of the codes listed are billable.