The block Q90–Q99 of ICD-10 is titled “Chromosomal abnormalities, not elsewhere classified”. It is part of Chapter XVII, Congenital malformations, deformations and chromosomal abnormalities, and holds 9 groups.
Codes in Q90–Q99
- Q91.0Trisomy 18, meiotic nondisjunction
- Q91.1Trisomy 18, mosaicism (mitotic nondisjunction)
- Q91.2Trisomy 18, translocation
- Q91.3Edwards syndrome, unspecified
- Q91.4Trisomy 13, meiotic nondisjunction
- Q91.5Trisomy 13, mosaicism (mitotic nondisjunction)
- Q91.6Trisomy 13, translocation
- Q91.7Patau syndrome, unspecified
- Q92.0Whole chromosome trisomy, meiotic nondisjunction
- Q92.1Whole chromosome trisomy, mosaicism (mitotic nondisjunction)
- Q92.2Major partial trisomy
- Q92.3Minor partial trisomy
- Q92.4Duplications seen only at prometaphase
- Q92.5Duplications with other complex rearrangements
- Q92.6Extra marker chromosomes
- Q92.7Triploidy and polyploidy
- Q92.8Other specified trisomies and partial trisomies of autosomes
- Q92.9Trisomy and partial trisomy of autosomes, unspecified
- Q93.0Whole chromosome monosomy, meiotic nondisjunction
- Q93.1Whole chromosome monosomy, mosaicism (mitotic nondisjunction)
- Q93.2Chromosome replaced with ring or dicentric
- Q93.3Deletion of short arm of chromosome 4
- Q93.4Deletion of short arm of chromosome 5
- Q93.5Other deletions of part of a chromosome
- Q93.6Deletions seen only at prometaphase
- Q93.7Deletions with other complex rearrangements
- Q93.8Other deletions from the autosomes
- Q93.9Deletion from autosomes, unspecified
- Q95.0Balanced translocation and insertion in normal individual
- Q95.1Chromosome inversion in normal individual
- Q95.2Balanced autosomal rearrangement in abnormal individual
- Q95.3Balanced sex/autosomal rearrangement in abnormal individual
- Q95.4Individuals with marker heterochromatin
- Q95.5Individuals with autosomal fragile site
- Q95.8Other balanced rearrangements and structural markers
- Q95.9Balanced rearrangement and structural marker, unspecified
- Q98.0Klinefelter syndrome karyotype 47,XXY
- Q98.1Klinefelter syndrome, male with more than two X chromosomes
- Q98.2Klinefelter syndrome, male with 46,XX karyotype
- Q98.3Other male with 46,XX karyotype
- Q98.4Klinefelter syndrome, unspecified
- Q98.5Karyotype 47,XYY
- Q98.6Male with structurally abnormal sex chromosome
- Q98.7Male with sex chromosome mosaicism
- Q98.8Other specified sex chromosome abnormalities, male phenotype
- Q98.9Sex chromosome abnormality, male phenotype, 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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