All ICD10 Codes
Chapter 17

Q00–Q99: Congenital Malformations, Deformations and Chromosomal Abnormalities

Congenital Malformations, Deformations and Chromosomal Abnormalities diagnostic classification updated for 2026.

Chapter Instructions

Excludes2(Not included here. Code separately if applicable.)
  • inborn errors of metabolism (E70-E88)
All CodesBillable Only
Internal Codes
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  • Q87.410—

    Marfan syndrome with aortic dilation

  • Q87.418—

    Marfan syndrome with other cardiovascular manifestations

  • Q87.42—

    Marfan syndrome with ocular manifestations

  • Q87.43—

    Marfan syndrome with skeletal manifestation

  • Q87.5—

    Other congenital malformation syndromes with other skeletal changes

  • Q87.8—

    Other specified congenital malformation syndromes, not elsewhere classified

  • Q87.81—

    Alport syndrome

  • Q87.82—

    Arterial tortuosity syndrome

  • Q87.83—

    Bardet-Biedl syndrome

  • Q87.84—

    Laurence-Moon syndrome

  • Q87.85—

    MED13L syndrome

  • Q87.86—

    Kleefstra syndrome

  • Q87.87—

    Hao-Fountain Syndrome

  • Q87.88—

    CTNNB1 syndrome

  • Q87.89—

    Other specified congenital malformation syndromes, not elsewhere classified

  • Q89—

    Other congenital malformations, not elsewhere classified

  • Q89.0—

    Congenital absence and malformations of spleen

  • Q89.01—

    Asplenia (congenital)

  • Q89.09—

    Congenital malformations of spleen

  • Q89.1—

    Congenital malformations of adrenal gland

  • Q89.2—

    Congenital malformations of other endocrine glands

  • Q89.3—

    Situs inversus

  • Q89.4—

    Conjoined twins

  • Q89.7—

    Multiple congenital malformations, not elsewhere classified

  • Q89.8—

    Other specified congenital malformations

  • Q89.81—

    Kabuki syndrome

  • Q89.89—

    Other specified congenital malformations

  • Q89.9—

    Congenital malformation, unspecified

  • Q90—

    Down syndrome

  • Q90.0—

    Trisomy 21, nonmosaicism (meiotic nondisjunction)

  • Q90.1—

    Trisomy 21, mosaicism (mitotic nondisjunction)

  • Q90.2—

    Trisomy 21, translocation

  • Q90.9—

    Down syndrome, unspecified

  • 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

  • Q92.0—

    Whole chromosome trisomy, nonmosaicism (meiotic nondisjunction)

  • Q92.1—

    Whole chromosome trisomy, mosaicism (mitotic nondisjunction)

  • Q92.2—

    Partial trisomy

  • Q92.5—

    Duplications with other complex rearrangements

  • Q92.6—

    Marker chromosomes

  • Q92.61—

    Marker chromosomes in normal individual

  • Q92.62—

    Marker chromosomes in abnormal individual

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