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Ch. XVII
ICD-10
Ch. XVII
Q90.9
Q90.9
Down syndrome, unspecified
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Coding guidance (WHO 2019)
Trisomy 21 NOS
Sibling codes
Q90
Down syndrome
Q90.0
Trisomy 21, meiotic nondisjunction
Q90.1
Trisomy 21, mosaicism (mitotic nondisjunction)
Q90.2
Trisomy 21, translocation
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