Q90.1 is the ICD-10 code for Trisomy 21, mosaicism (mitotic nondisjunction). It is a four-character subcategory of Q90 (Down syndrome), the most specific level in the WHO edition. It belongs to the block Q90–Q99 (Chromosomal abnormalities, not elsewhere classified) in Chapter XVII, Congenital malformations, deformations and chromosomal abnormalities.
- Code type
- Subcategory (4 characters)
- Chapter
- XVII · Q00–Q99
- Classification
- WHO ICD-10, 2019 version
Q90.1 in national editions
Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.
Q90.1Trisomi 21, mosaikk (mitotisk nondisjunksjon)
DQ901Trisomi 21, mosaik, mitotisk nondisjunktion
- DQ901ATrisomi 21-22, mosaik, mitotisk nondisjunktion
Q90.1Trisomia 21, mosaikismi (mitoottinen nondisjunktio)
Q90.1Trisomie 21, Mosaik (mitotische Non-disjunction)
Q90.1Trisomie 21, mosaïque chromosomique (non-disjonction mitotique)
Q90.1trisomie 21, mosaïcisme (mitotische non-disjunctie)
Q90.1Trisomy 21, mosaicism (mitotic nondisjunction)
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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