Q23 is the ICD-10 code for Congenital malformations of aortic and mitral valves. It is a three-character category divided into 7 subcodes; use the subcode whenever the record supports that level of detail. It belongs to the block Q20–Q28 (Congenital malformations of the circulatory system) in Chapter XVII, Congenital malformations, deformations and chromosomal abnormalities.
- Code type
- Category (3 characters)
- Chapter
- XVII · Q00–Q99
- Classification
- WHO ICD-10, 2019 version
Subcodes of Q23
- Q23.0Congenital stenosis of aortic valve
- Q23.1Congenital insufficiency of aortic valve
- Q23.2Congenital mitral stenosis
- Q23.3Congenital mitral insufficiency
- Q23.4Hypoplastic left heart syndrome
- Q23.8Other congenital malformations of aortic and mitral valves
- Q23.9Congenital malformation of aortic and mitral valves, unspecified
Q23 in national editions
Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.
DQ23Medfødte misdannelser af aorta- og mitralklapperne
Q23Aorttaläpän ja hiippaläpän synnynnäiset epämuodostumat
Q23Angeborene Fehlbildungen der Aorten- und der Mitralklappe
Q23Malformations congénitales des valvules aortique et mitrale
Q23congenitale misvormingen van aorta- en mitraliskleppen
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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