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