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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  • Q16.2—

    Absence of eustachian tube

  • Q16.3—

    Congenital malformation of ear ossicles

  • Q16.4—

    Other congenital malformations of middle ear

  • Q16.5—

    Congenital malformation of inner ear

  • Q16.9—

    Congenital malformation of ear causing impairment of hearing, unspecified

  • Q17—

    Other congenital malformations of ear

  • Q17.0—

    Accessory auricle

  • Q17.1—

    Macrotia

  • Q17.2—

    Microtia

  • Q17.3—

    Other misshapen ear

  • Q17.4—

    Misplaced ear

  • Q17.5—

    Prominent ear

  • Q17.8—

    Other specified congenital malformations of ear

  • Q17.9—

    Congenital malformation of ear, unspecified

  • Q18—

    Other congenital malformations of face and neck

  • Q18.0—

    Sinus, fistula and cyst of branchial cleft

  • Q18.1—

    Preauricular sinus and cyst

  • Q18.2—

    Other branchial cleft malformations

  • Q18.3—

    Webbing of neck

  • Q18.4—

    Macrostomia

  • Q18.5—

    Microstomia

  • Q18.6—

    Macrocheilia

  • Q18.7—

    Microcheilia

  • Q18.8—

    Other specified congenital malformations of face and neck

  • Q18.9—

    Congenital malformation of face and neck, unspecified

  • Q20—

    Congenital malformations of cardiac chambers and connections

  • Q20.0—

    Common arterial trunk

  • Q20.1—

    Double outlet right ventricle

  • Q20.2—

    Double outlet left ventricle

  • Q20.3—

    Discordant ventriculoarterial connection

  • Q20.4—

    Double inlet ventricle

  • Q20.5—

    Discordant atrioventricular connection

  • Q20.6—

    Isomerism of atrial appendages

  • Q20.8—

    Other congenital malformations of cardiac chambers and connections

  • Q20.9—

    Congenital malformation of cardiac chambers and connections, unspecified

  • Q21—

    Congenital malformations of cardiac septa

  • Q21.0—

    Ventricular septal defect

  • Q21.1—

    Atrial septal defect

  • Q21.10—

    Atrial septal defect, unspecified

  • Q21.11—

    Secundum atrial septal defect

  • Q21.12—

    Patent foramen ovale

  • Q21.13—

    Coronary sinus atrial septal defect

  • Q21.14—

    Superior sinus venosus atrial septal defect

  • Q21.15—

    Inferior sinus venosus atrial septal defect

  • Q21.16—

    Sinus venosus atrial septal defect, unspecified

  • Q21.19—

    Other specified atrial septal defect

  • Q21.2—

    Atrioventricular septal defect

  • Q21.20—

    Atrioventricular septal defect, unspecified as to partial or complete

  • Q21.21—

    Partial atrioventricular septal defect

  • Q21.22—

    Transitional atrioventricular septal defect

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