MS-DRG 600 – Non-Malignant Breast Disorders with CC/MCC
A Medical DRG in MDC 09 (Diseases & Disorders of the Skin, Subcutaneous Tissue & Breast). Inpatient cases group to DRG 600 when the ICD-10-CM principal diagnosis is one of the 91 codes listed below and a secondary diagnosis on the CC or MCC lists is present. Its FY 2026 relative weight is 1.0416 with a geometric mean length of stay of 3.2 days.
Severity family
The grouper first assigns the case to MDC 09 from the principal diagnosis and finds no qualifying operating-room procedure (this is a Medical DRG; ICD-10-PCS codes do not drive assignment here), then applies the severity split from secondary diagnoses: with CC/MCC → 600; without CC/MCC → 601.
Principal Diagnosis Codes 91 codes · 12 categories
D49 Neoplasms of unspecified behavior1 code
- D49.3 Neoplasm of unspecified behavior of breast
I97 Intraoperative and postprocedural complications and disorders of circulatory system, not elsewhere classified1 code
- I97.2 Postmastectomy lymphedema syndrome
N60 Benign mammary dysplasia21 codes
- N60.01 Solitary cyst of right breast
- N60.02 Solitary cyst of left breast
- N60.09 Solitary cyst of unspecified breast
- N60.11 Diffuse cystic mastopathy of right breast
- N60.12 Diffuse cystic mastopathy of left breast
- N60.19 Diffuse cystic mastopathy of unspecified breast
- N60.21 Fibroadenosis of right breast
- N60.22 Fibroadenosis of left breast
- N60.29 Fibroadenosis of unspecified breast
- N60.31 Fibrosclerosis of right breast
- N60.32 Fibrosclerosis of left breast
- N60.39 Fibrosclerosis of unspecified breast
- N60.41 Mammary duct ectasia of right breast
- N60.42 Mammary duct ectasia of left breast
- N60.49 Mammary duct ectasia of unspecified breast
- N60.81 Other benign mammary dysplasias of right breast
- N60.82 Other benign mammary dysplasias of left breast
- N60.89 Other benign mammary dysplasias of unspecified breast
- N60.91 Unspecified benign mammary dysplasia of right breast
- N60.92 Unspecified benign mammary dysplasia of left breast
- N60.99 Unspecified benign mammary dysplasia of unspecified breast
N61 Inflammatory disorders of breast6 codes
N62 Hypertrophy of breast1 code
- N62 Hypertrophy of breast
N63 Unspecified lump in breast17 codes
- N63.0 Unspecified lump in unspecified breast
- N63.10 Unspecified lump in the right breast, unspecified quadrant
- N63.11 Unspecified lump in the right breast, upper outer quadrant
- N63.12 Unspecified lump in the right breast, upper inner quadrant
- N63.13 Unspecified lump in the right breast, lower outer quadrant
- N63.14 Unspecified lump in the right breast, lower inner quadrant
- N63.15 Unspecified lump in the right breast, overlapping quadrants
- N63.20 Unspecified lump in the left breast, unspecified quadrant
- N63.21 Unspecified lump in the left breast, upper outer quadrant
- N63.22 Unspecified lump in the left breast, upper inner quadrant
- N63.23 Unspecified lump in the left breast, lower outer quadrant
- N63.24 Unspecified lump in the left breast, lower inner quadrant
- N63.25 Unspecified lump in the left breast, overlapping quadrants
- N63.31 Unspecified lump in axillary tail of the right breast
- N63.32 Unspecified lump in axillary tail of the left breast
- N63.41 Unspecified lump in right breast, subareolar
- N63.42 Unspecified lump in left breast, subareolar
N64 Other disorders of breast13 codes
- N64.0 Fissure and fistula of nipple
- N64.1 Fat necrosis of breast
- N64.2 Atrophy of breast
- N64.3 Galactorrhea not associated with childbirth
- N64.4 Mastodynia
- N64.51 Induration of breast
- N64.52 Nipple discharge
- N64.53 Retraction of nipple
- N64.59 Other signs and symptoms in breast
- N64.81 Ptosis of breast
- N64.82 Hypoplasia of breast
- N64.89 Other specified disorders of breast
- N64.9 Disorder of breast, unspecified
N65 Deformity and disproportion of reconstructed breast2 codes
Q83 Congenital malformations of breast6 codes
R92 Abnormal and inconclusive findings on diagnostic imaging of breast17 codes
- R92.0 Mammographic microcalcification found on diagnostic imaging of breast
- R92.1 Mammographic calcification found on diagnostic imaging of breast
- R92.2 Inconclusive mammogram
- R92.30 Dense breasts, unspecified
- R92.311 Mammographic fatty tissue density, right breast
- R92.312 Mammographic fatty tissue density, left breast
- R92.313 Mammographic fatty tissue density, bilateral breasts
- R92.321 Mammographic fibroglandular density, right breast
- R92.322 Mammographic fibroglandular density, left breast
- R92.323 Mammographic fibroglandular density, bilateral breasts
- R92.331 Mammographic heterogeneous density, right breast
- R92.332 Mammographic heterogeneous density, left breast
- R92.333 Mammographic heterogeneous density, bilateral breasts
- R92.341 Mammographic extreme density, right breast
- R92.342 Mammographic extreme density, left breast
- R92.343 Mammographic extreme density, bilateral breasts
- R92.8 Other abnormal and inconclusive findings on diagnostic imaging of breast
T85 Complications of other internal prosthetic devices, implants and grafts5 codes
- T85.41XA Breakdown (mechanical) of breast prosthesis and implant, initial encounter
- T85.42XA Displacement of breast prosthesis and implant, initial encounter
- T85.43XA Leakage of breast prosthesis and implant, initial encounter
- T85.44XA Capsular contracture of breast implant, initial encounter
- T85.49XA Other mechanical complication of breast prosthesis and implant, initial encounter
Z40 Encounter for prophylactic surgery1 code
- Z40.01 Encounter for prophylactic removal of breast
Procedure Codes
Frequently Asked Questions
What is MS-DRG 600?
MS-DRG 600 (Non-Malignant Breast Disorders with CC/MCC) is a medical DRG in MDC 09 (Diseases & Disorders of the Skin, Subcutaneous Tissue & Breast). Its FY 2026 relative weight is 1.0416 with a geometric mean length of stay of 3.2 days.
What is the difference between DRG 600, 601?
All 2 share the same base category; the severity of secondary diagnoses separates them: 600 (with CC/MCC), 601 (without CC/MCC). A major complication or comorbidity (MCC) places the case in the highest-weighted DRG of the family; a CC in the middle; neither in the lowest.
How many diagnosis codes group to DRG 600?
91 ICD-10-CM principal diagnosis codes group to this DRG, spanning 12 three-character categories.
What is the relative weight of DRG 600?
The FY 2026 relative weight of this DRG is 1.0416, meaning reimbursement of roughly 1.04 times the average Medicare inpatient case. Multiply by a hospital's blended base rate for the approximate payment.
