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ICD-10 diagnosis code

Q91.1 Trisomy 18, mosaicism (mitotic nondisjunction)

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Q91.1 is the ICD-10 code for Trisomy 18, mosaicism (mitotic nondisjunction). It is a four-character subcategory of Q91 (Edwards syndrome and Patau 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

Q91.1 in national editions

Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.

SwedenICD-10-SE

Q91.1Trisomi 18, mosaicism (mitotisk nondisjunction)

NorwayICD-10-NO

Q91.1Trisomi 18, mosaikk (mitotisk nondisjunksjon)

DenmarkICD-10-DK

DQ911Trisomi 18, mosaik mitotisk nondisjunktion

  • DQ911ATrisomi 17-18, mosaik mitotisk nondisjunktion
FinlandICD-10-FI

Q91.1Trisomia 18, mosaikismi (mitoottinen nondisjunktio)

GermanyICD-10-GM

Q91.1Trisomie 18, Mosaik (mitotische Non-disjunction)

FranceICD-10-FR

Q91.1Trisomie 18, mosaïque chromosomique (non-disjonction mitotique)

NetherlandsICD-10-NL

Q91.1trisomie 18, mosaïcisme (mitotische non-disjunctie)

United StatesICD-10-CM

Q91.1Trisomy 18, 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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