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ICD-10-CM Diagnosis Codes

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17. Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)

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Q90-Q99 Chromosomal abnormalities, not elsewhere classified (Q90-Q99)

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Q90 Down syndrome

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Q90.0   Trisomy 21, nonmosaicism (meiotic nondisjunction)
Q90.1   Trisomy 21, mosaicism (mitotic nondisjunction)
Q90.2   Trisomy 21, translocation
Q90.9   Down syndrome, unspecified
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