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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  • Q89.2—

    Congenital malformations of other endocrine glands

  • Q89.3—

    Situs inversus

  • Q89.4—

    Conjoined twins

  • Q89.7—

    Multiple congenital malformations, not elsewhere classified

  • Q89.81—

    Kabuki syndrome

  • Q89.89—

    Other specified congenital malformations

  • Q89.9—

    Congenital malformation, unspecified

  • Q90.0—

    Trisomy 21, nonmosaicism (meiotic nondisjunction)

  • Q90.1—

    Trisomy 21, mosaicism (mitotic nondisjunction)

  • Q90.2—

    Trisomy 21, translocation

  • Q90.9—

    Down syndrome, unspecified

  • Q91.0—

    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

  • Q92.0—

    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

  • Q92.61—

    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

  • Q92.9—

    Trisomy and partial trisomy of autosomes, unspecified

  • Q93.0—

    Whole chromosome monosomy, nonmosaicism (meiotic nondisjunction)

  • Q93.1—

    Whole chromosome monosomy, mosaicism (mitotic nondisjunction)

  • Q93.2—

    Chromosome replaced with ring, dicentric or isochromosome

  • Q93.3—

    Deletion of short arm of chromosome 4

  • Q93.4—

    Deletion of short arm of chromosome 5

  • Q93.51—

    Angelman syndrome

  • Q93.52—

    Phelan-McDermid syndrome

  • Q93.59—

    Other deletions of part of a chromosome

  • Q93.7—

    Deletions with other complex rearrangements

  • Q93.81—

    Velo-cardio-facial syndrome

  • Q93.82—

    Williams syndrome

  • Q93.88—

    Other microdeletions

  • Q93.89—

    Other deletions from the autosomes

  • Q93.9—

    Deletion from autosomes, unspecified

  • Q95.0—

    Balanced translocation and insertion in normal individual

  • Q95.1—

    Chromosome inversion in normal individual

  • Q95.2—

    Balanced autosomal rearrangement in abnormal individual

  • Q95.3—

    Balanced sex/autosomal rearrangement in abnormal individual

  • Q95.5—

    Individual with autosomal fragile site

  • Q95.8—

    Other balanced rearrangements and structural markers

  • Q95.9—

    Balanced rearrangement and structural marker, unspecified

  • Q96.0—

    Karyotype 45, X

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