N60.42 Mammary duct ectasia of left breast

Billable ICD-10-CM code, FY2026.

Applies from N60 Benign mammary dysplasia

Includes

• fibrocystic mastopathy

MS-DRG index

Defines the logic of DRG(s) 600-601 in MDC 09.

Approximate ICD-9-CM (GEMs)

• 610.4 Mammary duct ectasia (approximate)

Code annotations containing back-references to N60.42

Back-references to N60

• Type 2 Excludes: D24 Benign neoplasm of breast ("benign cyst of breast (N60.-)")
• Type 2 Excludes: D24 Benign neoplasm of breast ("benign mammary dysplasia (N60.-)")
• Type 2 Excludes: D24 Benign neoplasm of breast ("fibrocystic disease of breast (N60.-)")

Nearby codes

• N60.31 Fibrosclerosis of right breast
• N60.32 Fibrosclerosis of left breast
• N60.39 Fibrosclerosis of unspecified breast
• N60.4 Mammary duct ectasia
• N60.41 Mammary duct ectasia of right breast
• N60.42 Mammary duct ectasia of left breast (this code)
• N60.49 Mammary duct ectasia of unspecified breast
• N60.8 Other benign mammary dysplasias
• 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