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MS-DRG 601: NON-MALIGNANT BREAST DISORDERS WITHOUT CC/MCC

DRGMedicalMDC 09

MS-DRG 601 is non-malignant breast disorders without cc/mcc, in MDC 09 (a medical DRG), at the without-CC/MCC level. Its FY2027 relative weight is 0.6017, so a case here pays less than the average Medicare inpatient stay (weight 1.0), with a geometric mean length of stay of 2.30 days. 93 ICD-10-CM principal diagnoses group into MS-DRGs 600–601 under the CMS definitions manual; the most-searched are listed below.

FY2027 payment factors

Relative weight
0.6017
Geometric mean LOS
2.30
Arithmetic mean LOS
2.90
Post-acute transfer
No

Principal diagnoses that group to MS-DRGs 600–601

From the CMS MS-DRG definitions manual’s principal-diagnosis index: 93 ICD-10-CM codes route here, and the CC/MCC status of the secondary diagnoses decides which of 600–601 the case lands in. The 24 most-searched:

  • N62Hypertrophy of breast
  • N64.4Mastodynia
  • R92.2Inconclusive mammogram
  • R92.8Other abnormal and inconclusive findings on diagnostic imaging of breast
  • R92.30Dense breasts, unspecified
  • N63.0Unspecified lump in unspecified breast
  • N63.10Unspecified lump in the right breast, unspecified quadrant
  • N63.20Unspecified lump in the left breast, unspecified quadrant
  • N61.1Abscess of the breast and nipple
  • N64.89Other specified disorders of breast
  • R92.333Mammographic heterogeneous density, bilateral breasts
  • N61.0Mastitis without abscess
  • R92.1Mammographic calcification found on diagnostic imaging of breast
  • N60.02Solitary cyst of left breast
  • N60.11Diffuse cystic mastopathy of right breast
  • N63.11Unspecified lump in the right breast, upper outer quadrant
  • N63.12Unspecified lump in the right breast, upper inner quadrant
  • N63.13Unspecified lump in the right breast, lower outer quadrant
  • N63.21Unspecified lump in the left breast, upper outer quadrant
  • N63.25Unspecified lump in the left breast, overlapping quadrants
  • N64.52Nipple discharge
  • N64.59Other signs and symptoms in breast
  • N64.81Ptosis of breast
  • N64.9Disorder of breast, unspecified

69 more codes group here. Open any code above for its full hierarchy, or check a whole claim in the free DRG calculator.

The severity splits

Same base DRG, split by whether a secondary diagnosis is a CC or MCC. The last column is the weight change from MS-DRG 601.

600NON-MALIGNANT BREAST DISORDERS WITH CC/MCC0.9975+0.3958
601NON-MALIGNANT BREAST DISORDERS WITHOUT CC/MCC0.6017

All FY2027 MS-DRGs · MDC 09

MS-DRG (IPPS Table 5)FY2027