ICD-10 Code for Mastopathy
The default ICD-10-CM 2027 code for mastopathy, mastopathia is N64.9 – Disorder of breast, unspecified. More specific codes depend on the details documented, as listed in the official index (4 codes, 2 billable).
- Main code
N64.9– Disorder of breast, unspecified- Billable
- Yes
Index entries for Mastopathy
- chronica cystica – see Mastopathy, cystic
- cystic (chronic) (diffuse) –
N60.1-(header)- with epithelial proliferation –
N60.3-(header)
- with epithelial proliferation –
- diffuse cystic – see Mastopathy, cystic
- estrogenic, oestrogenica, oestrogenic –
N64.89 - ovarian origin –
N64.89
How to choose the right code
Start with the main term, then pick the indented subterm that matches the documentation (type, cause, site, laterality, episode of care). Always confirm the code in the tabular list: follow its Excludes1/Excludes2, “code first” and “use additional code” notes, and add a 7th character where required.
Source: CDC/NCHS ICD-10-CM FY2027 alphabetic index.