DRG 601

Medical DRG

Non-Malignant Breast Disorders without CC/MCC

TypeMedicalMDC09Dx Codes91

What is MS-DRG 601?

MS-DRG 601 is a Medical Medicare Severity Diagnosis Related Group under Major Diagnostic Category 09 (MDC 09) without a significant Complication or Comorbidity. It maps to 91 ICD-10-CM diagnosis codes. For FY 2026 it carries a relative weight of 0.6050 with a geometric mean length of stay of 2.3 days and an arithmetic mean of 2.6 days. Hospitals use this grouping to determine reimbursement for inpatient stays under Medicare.

Classification
Medical DRG
Diagnosis-driven grouping
Linked Codes
91 diagnosis
Billable Dx
100%
91 of 91 shown

FY 2026 Payment Data

Official values from Table 5 of the FY 2026 IPPS Final Rule (CMS).

Relative Weight
0.6050
Payment multiplier vs. average case (1.0)
Geometric Mean LOS
2.3 days
Used for transfer payment calculations
Arithmetic Mean LOS
2.6 days
Average length of stay
Post-Acute Transfer
No
Not subject to the transfer policy

Related MS-DRGs in This Severity Group

The same clinical condition is split into separate DRGs by complication severity. MCC pays more than CC, which pays more than no CC/MCC.

DRGTitleRel. WeightGMLOS
600Non-Malignant Breast Disorders with CC/MCC1.04163.2 days
601Non-Malignant Breast Disorders without CC/MCCThis page0.60502.3 days

Linked ICD-10-CM Diagnosis Mappings

  • D49.3

    Neoplasm of unspecified behavior of breast

    BillableChapter 2
  • I97.2

    Postmastectomy lymphedema syndrome

    BillableChapter 9
  • N60.01

    Solitary cyst of right breast

    BillableChapter 14
  • N60.02

    Solitary cyst of left breast

    BillableChapter 14
  • N60.09

    Solitary cyst of unspecified breast

    BillableChapter 14
  • N60.11

    Diffuse cystic mastopathy of right breast

    BillableChapter 14
  • N60.12

    Diffuse cystic mastopathy of left breast

    BillableChapter 14
  • N60.19

    Diffuse cystic mastopathy of unspecified breast

    BillableChapter 14
  • N60.21

    Fibroadenosis of right breast

    BillableChapter 14
  • N60.22

    Fibroadenosis of left breast

    BillableChapter 14
  • N60.29

    Fibroadenosis of unspecified breast

    BillableChapter 14
  • N60.31

    Fibrosclerosis of right breast

    BillableChapter 14
  • N60.32

    Fibrosclerosis of left breast

    BillableChapter 14
  • N60.39

    Fibrosclerosis of unspecified breast

    BillableChapter 14
  • N60.41

    Mammary duct ectasia of right breast

    BillableChapter 14
  • N60.42

    Mammary duct ectasia of left breast

    BillableChapter 14
  • N60.49

    Mammary duct ectasia of unspecified breast

    BillableChapter 14
  • N60.81

    Other benign mammary dysplasias of right breast

    BillableChapter 14
  • N60.82

    Other benign mammary dysplasias of left breast

    BillableChapter 14
  • N60.89

    Other benign mammary dysplasias of unspecified breast

    BillableChapter 14
  • N60.91

    Unspecified benign mammary dysplasia of right breast

    BillableChapter 14
  • N60.92

    Unspecified benign mammary dysplasia of left breast

    BillableChapter 14
  • N60.99

    Unspecified benign mammary dysplasia of unspecified breast

    BillableChapter 14
  • N61.0

    Mastitis without abscess

    BillableChapter 14
  • N61.1

    Abscess of the breast and nipple

    BillableChapter 14
  • N61.20

    Granulomatous mastitis, unspecified breast

    BillableChapter 14
  • N61.21

    Granulomatous mastitis, right breast

    BillableChapter 14
  • N61.22

    Granulomatous mastitis, left breast

    BillableChapter 14
  • N61.23

    Granulomatous mastitis, bilateral breast

    BillableChapter 14
  • N62

    Hypertrophy of breast

    BillableChapter 14
  • N63.0

    Unspecified lump in unspecified breast

    BillableChapter 14
  • N63.10

    Unspecified lump in the right breast, unspecified quadrant

    BillableChapter 14
  • N63.11

    Unspecified lump in the right breast, upper outer quadrant

    BillableChapter 14
  • N63.12

    Unspecified lump in the right breast, upper inner quadrant

    BillableChapter 14
  • N63.13

    Unspecified lump in the right breast, lower outer quadrant

    BillableChapter 14
  • N63.14

    Unspecified lump in the right breast, lower inner quadrant

    BillableChapter 14
  • N63.15

    Unspecified lump in the right breast, overlapping quadrants

    BillableChapter 14
  • N63.20

    Unspecified lump in the left breast, unspecified quadrant

    BillableChapter 14
  • N63.21

    Unspecified lump in the left breast, upper outer quadrant

    BillableChapter 14
  • N63.22

    Unspecified lump in the left breast, upper inner quadrant

    BillableChapter 14
  • N63.23

    Unspecified lump in the left breast, lower outer quadrant

    BillableChapter 14
  • N63.24

    Unspecified lump in the left breast, lower inner quadrant

    BillableChapter 14
  • N63.25

    Unspecified lump in the left breast, overlapping quadrants

    BillableChapter 14
  • N63.31

    Unspecified lump in axillary tail of the right breast

    BillableChapter 14
  • N63.32

    Unspecified lump in axillary tail of the left breast

    BillableChapter 14
  • N63.41

    Unspecified lump in right breast, subareolar

    BillableChapter 14
  • N63.42

    Unspecified lump in left breast, subareolar

    BillableChapter 14
  • N64.0

    Fissure and fistula of nipple

    BillableChapter 14
  • N64.1

    Fat necrosis of breast

    BillableChapter 14
  • N64.2

    Atrophy of breast

    BillableChapter 14
  • N64.3

    Galactorrhea not associated with childbirth

    BillableChapter 14
  • N64.4

    Mastodynia

    BillableChapter 14
  • N64.51

    Induration of breast

    BillableChapter 14
  • N64.52

    Nipple discharge

    BillableChapter 14
  • N64.53

    Retraction of nipple

    BillableChapter 14
  • N64.59

    Other signs and symptoms in breast

    BillableChapter 14
  • N64.81

    Ptosis of breast

    BillableChapter 14
  • N64.82

    Hypoplasia of breast

    BillableChapter 14
  • N64.89

    Other specified disorders of breast

    BillableChapter 14
  • N64.9

    Disorder of breast, unspecified

    BillableChapter 14
  • N65.0

    Deformity of reconstructed breast

    BillableChapter 14
  • N65.1

    Disproportion of reconstructed breast

    BillableChapter 14
  • Q83.0

    Congenital absence of breast with absent nipple

    BillableChapter 17
  • Q83.1

    Accessory breast

    BillableChapter 17
  • Q83.2

    Absent nipple

    BillableChapter 17
  • Q83.3

    Accessory nipple

    BillableChapter 17
  • Q83.8

    Other congenital malformations of breast

    BillableChapter 17
  • Q83.9

    Congenital malformation of breast, unspecified

    BillableChapter 17
  • R92.0

    Mammographic microcalcification found on diagnostic imaging of breast

    BillableChapter 18
  • R92.1

    Mammographic calcification found on diagnostic imaging of breast

    BillableChapter 18
  • R92.2

    Inconclusive mammogram

    BillableChapter 18
  • R92.30

    Dense breasts, unspecified

    BillableChapter 18
  • R92.311

    Mammographic fatty tissue density, right breast

    BillableChapter 18
  • R92.312

    Mammographic fatty tissue density, left breast

    BillableChapter 18
  • R92.313

    Mammographic fatty tissue density, bilateral breasts

    BillableChapter 18
  • R92.321

    Mammographic fibroglandular density, right breast

    BillableChapter 18
  • R92.322

    Mammographic fibroglandular density, left breast

    BillableChapter 18
  • R92.323

    Mammographic fibroglandular density, bilateral breasts

    BillableChapter 18
  • R92.331

    Mammographic heterogeneous density, right breast

    BillableChapter 18
  • R92.332

    Mammographic heterogeneous density, left breast

    BillableChapter 18
  • R92.333

    Mammographic heterogeneous density, bilateral breasts

    BillableChapter 18
  • R92.341

    Mammographic extreme density, right breast

    BillableChapter 18
  • R92.342

    Mammographic extreme density, left breast

    BillableChapter 18
  • R92.343

    Mammographic extreme density, bilateral breasts

    BillableChapter 18
  • R92.8

    Other abnormal and inconclusive findings on diagnostic imaging of breast

    BillableChapter 18
  • T85.41XA

    Breakdown (mechanical) of breast prosthesis and implant, initial encounter

    BillableChapter 19
  • T85.42XA

    Displacement of breast prosthesis and implant, initial encounter

    BillableChapter 19
  • T85.43XA

    Leakage of breast prosthesis and implant, initial encounter

    BillableChapter 19
  • T85.44XA

    Capsular contracture of breast implant, initial encounter

    BillableChapter 19
  • T85.49XA

    Other mechanical complication of breast prosthesis and implant, initial encounter

    BillableChapter 19
  • Z40.01

    Encounter for prophylactic removal of breast

    BillableChapter 21