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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  • Q83.3—

    Accessory nipple

  • Q83.8—

    Other congenital malformations of breast

  • Q83.9—

    Congenital malformation of breast, unspecified

  • Q84.0—

    Congenital alopecia

  • Q84.1—

    Congenital morphological disturbances of hair, not elsewhere classified

  • Q84.2—

    Other congenital malformations of hair

  • Q84.3—

    Anonychia

  • Q84.4—

    Congenital leukonychia

  • Q84.5—

    Enlarged and hypertrophic nails

  • Q84.6—

    Other congenital malformations of nails

  • Q84.8—

    Other specified congenital malformations of integument

  • Q84.9—

    Congenital malformation of integument, unspecified

  • Q85.00—

    Neurofibromatosis, unspecified

  • Q85.01—

    Neurofibromatosis, type 1

  • Q85.02—

    Neurofibromatosis, type 2

  • Q85.03—

    Schwannomatosis

  • Q85.09—

    Other neurofibromatosis

  • Q85.1—

    Tuberous sclerosis

  • Q85.81—

    PTEN hamartoma tumor syndrome

  • Q85.82—

    Other Cowden syndrome

  • Q85.83—

    Von Hippel-Lindau syndrome

  • Q85.89—

    Other phakomatoses, not elsewhere classified

  • Q85.9—

    Phakomatosis, unspecified

  • Q86.0—

    Fetal alcohol syndrome (dysmorphic)

  • Q86.1—

    Fetal hydantoin syndrome

  • Q86.2—

    Dysmorphism due to warfarin

  • Q86.8—

    Other congenital malformation syndromes due to known exogenous causes

  • Q87.0—

    Congenital malformation syndromes predominantly affecting facial appearance

  • Q87.11—

    Prader-Willi syndrome

  • Q87.19—

    Other congenital malformation syndromes predominantly associated with short stature

  • Q87.2—

    Congenital malformation syndromes predominantly involving limbs

  • Q87.3—

    Congenital malformation syndromes involving early overgrowth

  • Q87.40—

    Marfan syndrome, unspecified

  • 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

  • Q87.81—

    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

  • Q89.01—

    Asplenia (congenital)

  • Q89.09—

    Congenital malformations of spleen

  • Q89.1—

    Congenital malformations of adrenal gland

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