N21 is the ICD-10 code for Calculus of lower urinary tract. It is a three-character category divided into 4 subcodes; use the subcode whenever the record supports that level of detail. It belongs to the block N20–N23 (Urolithiasis) in Chapter XIV, Diseases of the genitourinary system.
- Code type
- Category (3 characters)
- Chapter
- XIV · N00–N99
- Classification
- WHO ICD-10, 2019 version
What N21 includes
Conditions and terms that are coded here.
- with cystitis and urethritis
Subcodes of N21
N21 in national editions
Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.
DN21Sten i nedre urinveje
N21Alempien virtsateiden kivitauti
N21Stein in den unteren Harnwegen
N21Calcul des voies urinaires inférieures
N21stenen van lagere urinewegen
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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