MS-DRG v44.0 · MDC 09: Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast
601 — Non-Malignant Breast Disorders without CC/MCC
- Relative weight
- 0.6017
- Geometric mean LOS
- 2.3 days
- Arithmetic mean LOS
- 2.9 days
- Type
- Medical
About MS-DRG 601
MS-DRG 601, Non-Malignant Breast Disorders without CC/MCC, is a medical DRG in MDC 09 (Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast) under MS-DRG version 44.0, which applies to inpatient discharges from October 1, 2026 through September 30, 2027.
Its FY2027 relative weight is 0.6017, so Medicare's base payment for this DRG is about 0.60 times the average inpatient case (below average), before hospital-specific adjustments. The geometric mean length of stay is 2.3 days and the arithmetic mean is 2.9 days.
It belongs to a 2-level severity family: DRG 600 (with CC/MCC, weight 0.9975) and DRG 601 (without CC/MCC, weight 0.6017). The highest-severity level carries 1.7 times the weight of the lowest, which is why documenting CC and MCC conditions matters.
93 ICD-10-CM diagnosis codes are part of this DRG's grouping logic; they are listed below.
ICD-10-CM codes that group to DRG 601 (93)
Chapter 2: Neoplasms
Chapter 9: Diseases of the circulatory system
Chapter 14: Diseases of the genitourinary system
- N60.01Solitary cyst of right breast
- N60.02Solitary cyst of left breast
- N60.09Solitary cyst of unspecified breast
- N60.11Diffuse cystic mastopathy of right breast
- N60.12Diffuse cystic mastopathy of left breast
- N60.19Diffuse cystic mastopathy of unspecified breast
- N60.21Fibroadenosis of right breast
- N60.22Fibroadenosis of left breast
- N60.29Fibroadenosis of unspecified breast
- N60.31Fibrosclerosis of right breast
- N60.32Fibrosclerosis of left breast
- N60.39Fibrosclerosis of unspecified breast
- N60.41Mammary duct ectasia of right breast
- N60.42Mammary duct ectasia of left breast
- N60.49Mammary duct ectasia of unspecified breast
- N60.81Other benign mammary dysplasias of right breast
- N60.82Other benign mammary dysplasias of left breast
- N60.89Other benign mammary dysplasias of unspecified breast
- N60.91Unspecified benign mammary dysplasia of right breast
- N60.92Unspecified benign mammary dysplasia of left breast
- N60.99Unspecified benign mammary dysplasia of unspecified breast
- N61.0Mastitis without abscess
- N61.1Abscess of the breast and nipple
- N61.20Granulomatous mastitis, unspecified breast
- N61.21Granulomatous mastitis, right breast
- N61.22Granulomatous mastitis, left breast
- N61.23Granulomatous mastitis, bilateral breast
- N62Hypertrophy of breast
- N63.0Unspecified lump in unspecified breast
- N63.10Unspecified lump in the right breast, unspecified quadrant
- 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
- N63.14Unspecified lump in the right breast, lower inner quadrant
- N63.15Unspecified lump in the right breast, overlapping quadrants
- N63.20Unspecified lump in the left breast, unspecified quadrant
- N63.21Unspecified lump in the left breast, upper outer quadrant
- N63.22Unspecified lump in the left breast, upper inner quadrant
- N63.23Unspecified lump in the left breast, lower outer quadrant
- N63.24Unspecified lump in the left breast, lower inner quadrant
- N63.25Unspecified lump in the left breast, overlapping quadrants
- N63.31Unspecified lump in axillary tail of the right breast
- N63.32Unspecified lump in axillary tail of the left breast
- N63.41Unspecified lump in right breast, subareolar
- N63.42Unspecified lump in left breast, subareolar
- N64.0Fissure and fistula of nipple
- N64.1Fat necrosis of breast
- N64.2Atrophy of breast
- N64.3Galactorrhea not associated with childbirth
- N64.4Mastodynia
- N64.51Induration of breast
- N64.52Nipple discharge
- N64.53Retraction of nipple
- N64.59Other signs and symptoms in breast
- N64.81Ptosis of breast
- N64.82Hypoplasia of breast
- N64.89Other specified disorders of breast
- N64.9Disorder of breast, unspecified
- N65.0Deformity of reconstructed breast
- N65.1Disproportion of reconstructed breast
- N99.860Intraoperative and postprocedural nipple ischemia
- N99.861Intraoperative and postprocedural nipple necrosis
Chapter 17: Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders
Chapter 18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
- R92.0Mammographic microcalcification found on diagnostic imaging of breast
- R92.1Mammographic calcification found on diagnostic imaging of breast
- R92.2Inconclusive mammogram
- R92.30Dense breasts, unspecified
- R92.311Mammographic fatty tissue density, right breast
- R92.312Mammographic fatty tissue density, left breast
- R92.313Mammographic fatty tissue density, bilateral breasts
- R92.321Mammographic fibroglandular density, right breast
- R92.322Mammographic fibroglandular density, left breast
- R92.323Mammographic fibroglandular density, bilateral breasts
- R92.331Mammographic heterogeneous density, right breast
- R92.332Mammographic heterogeneous density, left breast
- R92.333Mammographic heterogeneous density, bilateral breasts
- R92.341Mammographic extreme density, right breast
- R92.342Mammographic extreme density, left breast
- R92.343Mammographic extreme density, bilateral breasts
- R92.8Other abnormal and inconclusive findings on diagnostic imaging of breast
Chapter 19: Injury, poisoning and certain other consequences of external causes
- T85.41XABreakdown (mechanical) of breast prosthesis and implant, initial encounter
- T85.42XADisplacement of breast prosthesis and implant, initial encounter
- T85.43XALeakage of breast prosthesis and implant, initial encounter
- T85.44XACapsular contracture of breast implant, initial encounter
- T85.49XAOther mechanical complication of breast prosthesis and implant, initial encounter
Chapter 21: Factors influencing health status and contact with health services
Common questions about DRG 601
What is the relative weight of DRG 601?
- 0.6017 for FY2027 (MS-DRG v44.0), from the IPPS final rule Table 5.
What is the average length of stay for DRG 601?
- The geometric mean length of stay is 2.3 days; the arithmetic mean is 2.9 days.
Is DRG 601 medical or surgical?
- DRG 601 is a medical DRG.