Chromosomal abnormalities, not elsewhere classified (Q90-Q99)
Q91: Trisomy 18 and Trisomy 13
Q91.0: Trisomy 18, nonmosaicism (meiotic nondisjunction)
Q91.1: Trisomy 18, mosaicism (mitotic nondisjunction)
Q91.2: Trisomy 18, translocation
Q91.3: Trisomy 18, unspecified
Q91.4: Trisomy 13, nonmosaicism (meiotic nondisjunction)
Q91.5: Trisomy 13, mosaicism (mitotic nondisjunction)
Q91.6: Trisomy 13, translocation
Q91.7: Trisomy 13, unspecified

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