Chapter 17
Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders
Q00–QA1
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FY 2027 effective October 1, 2026 · 89 categories in this chapter
Blocks in This Chapter
ICD-10-CM groups this chapter's categories into 12 blocks of three-character categories.
- Q00 –Q07 Congenital malformations of the nervous system
- Q10 –Q18 Congenital malformations of eye, ear, face and neck
- Q20 –Q28 Congenital malformations of the circulatory system
- Q30 –Q34 Congenital malformations of the respiratory system
- Q35 –Q37 Cleft lip and cleft palate
- Q38 –Q45 Other congenital malformations of the digestive system
- Q50 –Q56 Congenital malformations of genital organs
- Q60 –Q64 Congenital malformations of the urinary system
- Q65 –Q79 Congenital malformations and deformations of the musculoskeletal system
- Q80 –Q89 Other congenital malformations
- Q90 –Q99 Chromosomal abnormalities, not elsewhere classified
- QA0 –QA1 Genetic disorders, not elsewhere classified
Categories
Congenital malformations of the nervous system (Q00-Q07)
- Q00 Anencephaly and similar malformations Has subcategories
- Q01 Encephalocele Has subcategories
- Q02 Microcephaly
- Q03 Congenital hydrocephalus Has subcategories
- Q04 Other congenital malformations of brain Has subcategories
- Q05 Spina bifida Has subcategories
- Q06 Other congenital malformations of spinal cord Has subcategories
- Q07 Other congenital malformations of nervous system Has subcategories
Congenital malformations of eye, ear, face and neck (Q10-Q18)
- Q10 Congenital malformations of eyelid, lacrimal apparatus and orbit Has subcategories
- Q11 Anophthalmos, microphthalmos and macrophthalmos Has subcategories
- Q12 Congenital lens malformations Has subcategories
- Q13 Congenital malformations of anterior segment of eye Has subcategories
- Q14 Congenital malformations of posterior segment of eye Has subcategories
- Q15 Other congenital malformations of eye Has subcategories
- Q16 Congenital malformations of ear causing impairment of hearing Has subcategories
- Q17 Other congenital malformations of ear Has subcategories
- Q18 Other congenital malformations of face and neck Has subcategories
Congenital malformations of the circulatory system (Q20-Q28)
- Q20 Congenital malformations of cardiac chambers and connections Has subcategories
- Q21 Congenital malformations of cardiac septa Has subcategories
- Q22 Congenital malformations of pulmonary and tricuspid valves Has subcategories
- Q23 Congenital malformations of aortic and mitral valves Has subcategories
- Q24 Other congenital malformations of heart Has subcategories
- Q25 Congenital malformations of great arteries Has subcategories
- Q26 Congenital malformations of great veins Has subcategories
- Q27 Other congenital malformations of peripheral vascular system Has subcategories
- Q28 Other congenital malformations of circulatory system Has subcategories
Congenital malformations of the respiratory system (Q30-Q34)
- Q30 Congenital malformations of nose Has subcategories
- Q31 Congenital malformations of larynx Has subcategories
- Q32 Congenital malformations of trachea and bronchus Has subcategories
- Q33 Congenital malformations of lung Has subcategories
- Q34 Other congenital malformations of respiratory system Has subcategories
Cleft lip and cleft palate (Q35-Q37)
Other congenital malformations of the digestive system (Q38-Q45)
- Q38 Other congenital malformations of tongue, mouth and pharynx Has subcategories
- Q39 Congenital malformations of esophagus Has subcategories
- Q40 Other congenital malformations of upper alimentary tract Has subcategories
- Q41 Congenital absence, atresia and stenosis of small intestine Has subcategories
- Q42 Congenital absence, atresia and stenosis of large intestine Has subcategories
- Q43 Other congenital malformations of intestine Has subcategories
- Q44 Congenital malformations of gallbladder, bile ducts and liver Has subcategories
- Q45 Other congenital malformations of digestive system Has subcategories
Congenital malformations of genital organs (Q50-Q56)
- Q50 Congenital malformations of ovaries, fallopian tubes and broad ligaments Has subcategories
- Q51 Congenital malformations of uterus and cervix Has subcategories
- Q52 Other congenital malformations of female genitalia Has subcategories
- Q53 Undescended and ectopic testicle Has subcategories
- Q54 Hypospadias Has subcategories
- Q55 Other congenital malformations of male genital organs Has subcategories
- Q56 Indeterminate sex and pseudohermaphroditism Has subcategories
Congenital malformations of the urinary system (Q60-Q64)
- Q60 Renal agenesis and other reduction defects of kidney Has subcategories
- Q61 Cystic kidney disease Has subcategories
- Q62 Congenital obstructive defects of renal pelvis and congenital malformations of ureter Has subcategories
- Q63 Other congenital malformations of kidney Has subcategories
- Q64 Other congenital malformations of urinary system Has subcategories
Congenital malformations and deformations of the musculoskeletal system (Q65-Q79)
- Q65 Congenital deformities of hip Has subcategories
- Q66 Congenital deformities of feet Has subcategories
- Q67 Congenital musculoskeletal deformities of head, face, spine and chest Has subcategories
- Q68 Other congenital musculoskeletal deformities Has subcategories
- Q69 Polydactyly Has subcategories
- Q70 Syndactyly Has subcategories
- Q71 Reduction defects of upper limb Has subcategories
- Q72 Reduction defects of lower limb Has subcategories
- Q73 Reduction defects of unspecified limb Has subcategories
- Q74 Other congenital malformations of limb(s) Has subcategories
- Q75 Other congenital malformations of skull and face bones Has subcategories
- Q76 Congenital malformations of spine and bony thorax Has subcategories
- Q77 Osteochondrodysplasia with defects of growth of tubular bones and spine Has subcategories
- Q78 Other osteochondrodysplasias Has subcategories
- Q79 Congenital malformations of musculoskeletal system, not elsewhere classified Has subcategories
Other congenital malformations (Q80-Q89)
- Q80 Congenital ichthyosis Has subcategories
- Q81 Epidermolysis bullosa Has subcategories
- Q82 Other congenital malformations of skin Has subcategories
- Q83 Congenital malformations of breast Has subcategories
- Q84 Other congenital malformations of integument Has subcategories
- Q85 Phakomatoses, not elsewhere classified Has subcategories
- Q86 Congenital malformation syndromes due to known exogenous causes, not elsewhere classified Has subcategories
- Q87 Other specified congenital malformation syndromes affecting multiple systems Has subcategories
- Q89 Other congenital malformations, not elsewhere classified Has subcategories
Chromosomal abnormalities, not elsewhere classified (Q90-Q99)
- Q90 Down syndrome Has subcategories
- Q91 Trisomy 18 and Trisomy 13 Has subcategories
- Q92 Other trisomies and partial trisomies of the autosomes, not elsewhere classified Has subcategories
- Q93 Monosomies and deletions from the autosomes, not elsewhere classified Has subcategories
- Q95 Balanced rearrangements and structural markers, not elsewhere classified Has subcategories
- Q96 Turner's syndrome Has subcategories
- Q97 Other sex chromosome abnormalities, female phenotype, not elsewhere classified Has subcategories
- Q98 Other sex chromosome abnormalities, male phenotype, not elsewhere classified Has subcategories
- Q99 Other chromosome abnormalities, not elsewhere classified Has subcategories