N60 vs N60.1
N60 and N60.1 can never be reported together. ICD-10-CM declares them mutually exclusive with an Excludes1 note, meaning the two conditions cannot occur in the same patient — so exactly one of them is correct for any given encounter.
The official note, declared on N60.1
diffuse cystic mastopathy with epithelial proliferation (N60.3-)
N60
Benign mammary dysplasia
Not billable
- Chapter 14
- Diseases of the genitourinary system
- Section
- N60-N65
Use when the record says
- fibrocystic mastopathy
N60.1
Diffuse cystic mastopathy
Not billable
- Chapter 14
- Diseases of the genitourinary system
- Section
- N60-N65
Use when the record says
- Cystic breast
- Fibrocystic disease of breast
Indexed under
- Mastopathy, mastopathia › cystic
Excludes1 is not always absolute: where two conditions covered by the note are genuinely unrelated, CMS guidance permits reporting both. Document the reasoning rather than assuming it. More on Excludes1 vs Excludes2 · FY2027