C21.0 is the ICD-10 code for Malignant neoplasm: Anus, unspecified. It is a four-character subcategory of C21 (Malignant neoplasm of anus and anal canal), the most specific level in the WHO edition. It belongs to the block C15–C26 (Malignant neoplasms of digestive organs) in Chapter II, Neoplasms.
- Code type
- Subcategory (4 characters)
- Chapter
- II · C00–D48
- Classification
- WHO ICD-10, 2019 version
What C21.0 excludes
Conditions that look similar but belong under another code.
C21.0 in national editions
Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.
C21.0Ondartet svulst i uspesifisert del av endetarmsåpning
DC210Kræft i endetarmsåbningen UNS
C21.0Anus, nicht näher bezeichnet
C21.0Anus, sans précision
C21.0anus, niet-gespecificeerd
C21.0Malignant neoplasm of anus, unspecified
Based on the World Health Organization’s International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10), 2019 version, and the national editions published by each country’s health authority. This page is a reference, not coding advice; follow your national coding rules when you report.
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