Table of Neoplasms: Anatomical Sites Starting With O ICD-10-CM
The letter O section of the FY 2026 Table of Neoplasms covers 32 anatomical site entries under 14 top-level anatomical sites. Each row carries up to six ICD-10-CM codes, one per behavior column, and sub-entries are indented under their parent exactly as the printed CMS table nests them.
Table of Neoplasms: O 32 entries
Indented rows are sub-entries of the entry above them. The filter matches the full path, so typing a parent term finds its sub-entries too.
Questions About This Page
How do I pick the right column?
The pathology or clinical documentation names the behavior. When the description of the neoplasm names the behavior, that description overrides the Index guidance, and the matching column supplies the code.
Why are some cells empty?
Not every site has a code for every behavior. An empty cell means the classification does not provide a code in that column for that site, and the parent row or the main Index should be consulted.
Related References
Source: official CMS FY 2026 ICD-10-CM release, effective October 1, 2025 through September 30, 2026.
