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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  • Q38.1—

    Ankyloglossia

  • Q38.2—

    Macroglossia

  • Q38.3—

    Other congenital malformations of tongue

  • Q38.4—

    Congenital malformations of salivary glands and ducts

  • Q38.5—

    Congenital malformations of palate, not elsewhere classified

  • Q38.6—

    Other congenital malformations of mouth

  • Q38.7—

    Congenital pharyngeal pouch

  • Q38.8—

    Other congenital malformations of pharynx

  • Q39—

    Congenital malformations of esophagus

  • Q39.0—

    Atresia of esophagus without fistula

  • Q39.1—

    Atresia of esophagus with tracheo-esophageal fistula

  • Q39.2—

    Congenital tracheo-esophageal fistula without atresia

  • Q39.3—

    Congenital stenosis and stricture of esophagus

  • Q39.4—

    Esophageal web

  • Q39.5—

    Congenital dilatation of esophagus

  • Q39.6—

    Congenital diverticulum of esophagus

  • Q39.8—

    Other congenital malformations of esophagus

  • Q39.9—

    Congenital malformation of esophagus, unspecified

  • Q40—

    Other congenital malformations of upper alimentary tract

  • Q40.0—

    Congenital hypertrophic pyloric stenosis

  • Q40.1—

    Congenital hiatus hernia

  • Q40.2—

    Other specified congenital malformations of stomach

  • Q40.3—

    Congenital malformation of stomach, unspecified

  • Q40.8—

    Other specified congenital malformations of upper alimentary tract

  • Q40.9—

    Congenital malformation of upper alimentary tract, unspecified

  • Q41—

    Congenital absence, atresia and stenosis of small intestine

  • Q41.0—

    Congenital absence, atresia and stenosis of duodenum

  • Q41.1—

    Congenital absence, atresia and stenosis of jejunum

  • Q41.2—

    Congenital absence, atresia and stenosis of ileum

  • Q41.8—

    Congenital absence, atresia and stenosis of other specified parts of small intestine

  • Q41.9—

    Congenital absence, atresia and stenosis of small intestine, part unspecified

  • Q42—

    Congenital absence, atresia and stenosis of large intestine

  • Q42.0—

    Congenital absence, atresia and stenosis of rectum with fistula

  • Q42.1—

    Congenital absence, atresia and stenosis of rectum without fistula

  • Q42.2—

    Congenital absence, atresia and stenosis of anus with fistula

  • Q42.3—

    Congenital absence, atresia and stenosis of anus without fistula

  • Q42.8—

    Congenital absence, atresia and stenosis of other parts of large intestine

  • Q42.9—

    Congenital absence, atresia and stenosis of large intestine, part unspecified

  • Q43—

    Other congenital malformations of intestine

  • Q43.0—

    Meckel's diverticulum (displaced) (hypertrophic)

  • Q43.1—

    Hirschsprung's disease

  • Q43.2—

    Other congenital functional disorders of colon

  • Q43.3—

    Congenital malformations of intestinal fixation

  • Q43.4—

    Duplication of intestine

  • Q43.5—

    Ectopic anus

  • Q43.6—

    Congenital fistula of rectum and anus

  • Q43.7—

    Persistent cloaca

  • Q43.8—

    Other specified congenital malformations of intestine

  • Q43.9—

    Congenital malformation of intestine, unspecified

  • Q44—

    Congenital malformations of gallbladder, bile ducts and liver

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