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  3. Ch. Q00-QA0
  4. Sec. Q90-Q99
  5. Category Q91
Category Q91

Trisomy 18 and Trisomy 13

Clinical Classification Guidelines

Specific Diagnosis Codes

Trisomy 18, nonmosaicism (meiotic nondisjunction)
Q91.0
Trisomy 18, mosaicism (mitotic nondisjunction)
Q91.1
Trisomy 18, translocation
Q91.2
Trisomy 18, unspecified
Q91.3
Trisomy 13, nonmosaicism (meiotic nondisjunction)
Q91.4
Trisomy 13, mosaicism (mitotic nondisjunction)
Q91.5
Trisomy 13, translocation
Q91.6
Trisomy 13, unspecified
Q91.7
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Data updated for October 2025 release.

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