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 additional code(s) to identify any associated physical conditions and degree of mental retardation (F70-F79)
 * Q90.0 Trisomy 21, nonmosaicism (meiotic nondisjunction)
 * Q90.1 Trisomy 21, mosaicism (mitotic nondisjunction)
 * Q90.2 Trisomy 21, translocation
 * Q90.9 Down's syndrome, unspecified
 * Trisomy 21 NOS

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

Q92 Other trisomies and partial trisomies of the autosomes, not elsewhere classified

 * Includes: unbalanced translocations and insertions
 * Excludes1: trisomies of chromosomes 13, 18, 21 (Q90-Q91)
 * Q92.0 Whole chromosome trisomy, nonmosaicism (meiotic nondisjunction)
 * Q92.1 Whole chromosome trisomy, mosaicism (mitotic nondisjunction)
 * Q92.2 Partial trisomy
 * Less than whole arm duplicated
 * Whole arm or more duplicated
 * Excludes1: partial trisomy due to unbalanced translocation (Q92.5)
 * Q92.5 Duplications with other complex rearrangements
 * Partial trisomy due to unbalanced translocations
 * Code also any associated deletions due to unbalanced translocations, inversions and insertions (Q93.7)
 * Q92.6 Marker chromosomes
 * Trisomies due to dicentrics
 * Trisomies due to extra rings
 * Trisomies due to isochromosomes
 * Individual with marker heterochromatin
 * Q92.61 Marker chromosomes in normal individual
 * Q92.62 Marker chromosomes in abnormal individual
 * Q92.7 Triploidy and polyploidy
 * Q92.8 Other specified trisomies and partial trisomies of autosomes
 * Duplications identified by fluorescence in situ hybridization (FISH)
 * Duplications identified by in situ hybridization (ISH)
 * Duplications seen only at prometaphase
 * Q92.9 Trisomy and partial trisomy of autosomes, unspecified

==Q93