N60.19 Diffuse cystic mastopathy of unspecified breast

Billable ICD-10-CM code, FY2026.

Applies from N60 Benign mammary dysplasia

Includes

• fibrocystic mastopathy

Applies from N60.1 Diffuse cystic mastopathy

Applicable to

• Cystic breast
• Fibrocystic disease of breast

Excludes1 (never code together)

• diffuse cystic mastopathy with epithelial proliferation (N60.3-)

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 610.1 Diffuse cystic mastopathy (approximate)

Medicare Code Edits (MCE v43.1 (April 2026))

• Adult diagnoses (age 15 through 124): Age conflict edit. These diagnoses are clinically expected only in patients age 15 through 124.

Code annotations containing back-references to N60.19

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

• N60.02 Solitary cyst of left breast
• N60.09 Solitary cyst of unspecified breast
• N60.1 Diffuse cystic mastopathy
• N60.11 Diffuse cystic mastopathy of right breast
• N60.12 Diffuse cystic mastopathy of left breast
• N60.19 Diffuse cystic mastopathy of unspecified breast (this code)
• N60.2 Fibroadenosis of breast
• N60.21 Fibroadenosis of right breast
• N60.22 Fibroadenosis of left breast
• N60.29 Fibroadenosis of unspecified breast
• N60.3 Fibrosclerosis of breast