ICD-10-CM Alphabetic Index · FY 2026 7 Entries
Mastopathy in the ICD-10-CM Index ICD-10-CM
The main term Mastopathy, mastopathia carries 7 index entries pointing to 4 ICD-10-CM codes. The default entry is N64.9, the code the bare main term maps to; every indented line below refines the term by site, cause, or type. Verify any candidate code in the Tabular List before using it.
✓ Built from the official CMS FY 2026 index fileEffective Oct 1, 2025 – Sep 30, 2026
7
Index Entries
4
Codes Referenced
N64.9
Default Code
M
Letter
7 of 7 shown
ICD-10-CM
Index Entries Under Mastopathy 7 entries · 4 codes
Mastopathy, mastopathia N64.9
chronica cystica see Mastopathy, cystic
cystic (chronic) (diffuse) N60.1- Non-billable
with epithelial proliferation N60.3- Non-billable
diffuse cystic see Mastopathy, cystic
estrogenic, oestrogenica, oestrogenic N64.89
ovarian origin N64.89
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Related Index Terms
Source: Centers for Medicare & Medicaid Services, FY 2026 ICD-10-CM Index to Diseases and Injuries release files, effective October 1, 2025 through September 30, 2026.
