Q00-Q99
Medium Complexity

Other congenital malformations

Primary Specialty: Pediatrics
Last Updated: 2025-09-10

ICD-10 Codes (200)

180 billable
0 category headers
Q01
Encephalocele
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Q01.0
Billable
Frontal encephalocele
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Q01.1
Billable
Nasofrontal encephalocele
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Q01.2
Billable
Occipital encephalocele
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Q01.8
Billable
Encephalocele of other sites
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Q01.9
Billable
Encephalocele, unspecified
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Q02
Billable
Microcephaly
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Q03
Congenital hydrocephalus
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Q03.0
Billable
Malformations of aqueduct of Sylvius
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Q03.1
Billable
Atresia of foramina of Magendie and Luschka
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Q03.8
Billable
Other congenital hydrocephalus
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Q03.9
Billable
Congenital hydrocephalus, unspecified
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Q04
Other congenital malformations of brain
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Q04.0
Billable
Congenital malformations of corpus callosum
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Q04.1
Billable
Arhinencephaly
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Q04.2
Billable
Holoprosencephaly
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Q04.3
Billable
Other reduction deformities of brain
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Q04.4
Billable
Septo-optic dysplasia of brain
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Q04.5
Billable
Megalencephaly
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Q04.6
Billable
Congenital cerebral cysts
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Q04.8
Billable
Other specified congenital malformations of brain
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Q04.9
Billable
Congenital malformation of brain, unspecified
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Q05
Billable
Spina bifida
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Q05.0
Billable
Cervical spina bifida with hydrocephalus
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Q05.1
Billable
Thoracic spina bifida with hydrocephalus
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Q05.2
Billable
Lumbar spina bifida with hydrocephalus
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Q05.3
Billable
Sacral spina bifida with hydrocephalus
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Q05.4
Billable
Unspecified spina bifida with hydrocephalus
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Q05.5
Billable
Cervical spina bifida without hydrocephalus
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Q05.6
Billable
Thoracic spina bifida without hydrocephalus
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Q05.7
Billable
Lumbar spina bifida without hydrocephalus
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Q05.8
Billable
Sacral spina bifida without hydrocephalus
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Q05.9
Billable
Spina bifida, unspecified
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Q06
Other congenital malformations of spinal cord
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Q06.0
Billable
Amyelia
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Q06.1
Billable
Hypoplasia and dysplasia of spinal cord
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Q06.2
Billable
Diastematomyelia
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Q06.3
Billable
Other congenital cauda equina malformations
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Q06.4
Billable
Hydromyelia
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Q06.8
Billable
Other specified congenital malformations of spinal cord
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Q06.9
Billable
Congenital malformation of spinal cord, unspecified
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Q07
Other congenital malformations of nervous system
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Q07.0
Billable
Arnold-Chiari syndrome
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Q07.00
Billable
Arnold-Chiari syndrome without spina bifida or hydrocephalus
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Q07.01
Billable
Arnold-Chiari syndrome with spina bifida
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Q07.02
Billable
Arnold-Chiari syndrome with hydrocephalus
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Q07.03
Billable
Arnold-Chiari syndrome with spina bifida and hydrocephalus
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Q07.8
Billable
Other specified congenital malformations of nervous system
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Q07.9
Billable
Congenital malformation of nervous system, unspecified
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Q10
Congenital malformations of eyelid, lacrimal apparatus and orbit
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Q10.0
Billable
Congenital ptosis
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Q10.1
Billable
Congenital ectropion
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Q10.2
Billable
Congenital entropion
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Q10.3
Billable
Other congenital malformations of eyelid
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Q10.4
Billable
Absence and agenesis of lacrimal apparatus
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Q10.5
Billable
Congenital stenosis and stricture of lacrimal duct
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Q10.6
Billable
Other congenital malformations of lacrimal apparatus
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Q10.7
Billable
Congenital malformation of orbit
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Q11
Anophthalmos, microphthalmos and macrophthalmos
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Q11.0
Billable
Cystic eyeball
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Q11.1
Billable
Other anophthalmos
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Q11.2
Billable
Microphthalmos
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Q11.3
Billable
Macrophthalmos
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Q12
Congenital lens malformations
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Q12.0
Billable
Congenital cataract
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Q12.1
Billable
Congenital displaced lens
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Q12.2
Billable
Coloboma of lens
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Q12.3
Billable
Congenital aphakia
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Q12.4
Billable
Spherophakia
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Q12.8
Billable
Other congenital lens malformations
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Q12.9
Billable
Congenital lens malformation, unspecified
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Q13
Congenital malformations of anterior segment of eye
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Q13.0
Billable
Coloboma of iris
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Q13.1
Billable
Absence of iris
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Q13.2
Billable
Other congenital malformations of iris
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Q13.3
Billable
Congenital corneal opacity
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Q13.4
Billable
Other congenital corneal malformations
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Q13.5
Billable
Blue sclera
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Q13.8
Billable
Other congenital malformations of anterior segment of eye
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Q13.81
Billable
Rieger anomaly
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Q13.89
Billable
Other congenital malformations of anterior segment of eye
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Q13.9
Billable
Congenital malformation of anterior segment of eye, unspecified
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Q14
Congenital malformations of posterior segment of eye
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Q14.0
Billable
Congenital malformation of vitreous humor
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Q14.1
Billable
Congenital malformation of retina
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Q14.2
Billable
Congenital malformation of optic disc
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Q14.3
Billable
Congenital malformation of choroid
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Q14.8
Billable
Other congenital malformations of posterior segment of eye
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Q14.9
Billable
Congenital malformation of posterior segment of eye, unspecified
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Q15
Other congenital malformations of eye
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Q15.0
Billable
Congenital glaucoma
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Q15.8
Billable
Other specified congenital malformations of eye
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Q15.9
Billable
Congenital malformation of eye, unspecified
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Q16
Congenital malformations of ear causing impairment of hearing
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Q16.0
Billable
Congenital absence of (ear) auricle
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Q16.1
Billable
Congenital absence, atresia and stricture of auditory canal (external)
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Q16.2
Billable
Absence of eustachian tube
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Q16.3
Billable
Congenital malformation of ear ossicles
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Q16.4
Billable
Other congenital malformations of middle ear
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Q16.5
Billable
Congenital malformation of inner ear
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Q16.9
Billable
Congenital malformation of ear causing impairment of hearing, unspecified
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Q17
Other congenital malformations of ear
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Q17.0
Billable
Accessory auricle
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Q17.1
Billable
Macrotia
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Q17.2
Billable
Microtia
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Q17.3
Billable
Other misshapen ear
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Q17.4
Billable
Misplaced ear
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Q17.5
Billable
Prominent ear
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Q17.8
Billable
Other specified congenital malformations of ear
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Q17.9
Billable
Congenital malformation of ear, unspecified
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Q18
Other congenital malformations of face and neck
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Q18.0
Billable
Sinus, fistula and cyst of branchial cleft
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Q18.1
Billable
Preauricular sinus and cyst
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Q18.2
Billable
Other branchial cleft malformations
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Q18.3
Billable
Webbing of neck
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Q18.4
Billable
Macrostomia
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Q18.5
Billable
Microstomia
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Q18.6
Billable
Macrocheilia
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Q18.7
Billable
Microcheilia
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Q18.8
Billable
Other specified congenital malformations of face and neck
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Q18.9
Billable
Congenital malformation of face and neck, unspecified
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Q20
Congenital malformations of cardiac chambers and connections
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Q20.0
Billable
Common arterial trunk
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Q20.1
Billable
Double outlet right ventricle
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Q20.2
Billable
Double outlet left ventricle
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Q20.3
Billable
Discordant ventriculoarterial connection
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Q20.4
Billable
Double inlet ventricle
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Q20.5
Billable
Discordant atrioventricular connection
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Q20.6
Billable
Isomerism of atrial appendages
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Q20.8
Billable
Other congenital malformations of cardiac chambers and connections
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Q20.9
Billable
Congenital malformation of cardiac chambers and connections, unspecified
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Q21
Congenital malformations of cardiac septa
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Q21.0
Billable
Ventricular septal defect
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Q21.1
Billable
Atrial septal defect
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Q21.10
Billable
Atrial septal defect, unspecified
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Q21.11
Billable
Secundum atrial septal defect
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Q21.12
Billable
Patent foramen ovale
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Q21.13
Billable
Coronary sinus atrial septal defect
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Q21.14
Billable
Superior sinus venosus atrial septal defect
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Q21.15
Billable
Inferior sinus venosus atrial septal defect
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Q21.16
Billable
Sinus venosus atrial septal defect, unspecified
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Q21.19
Billable
Other specified atrial septal defect
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Q21.2
Billable
Atrioventricular septal defect
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Q21.20
Billable
Atrioventricular septal defect, unspecified as to partial or complete
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Q21.21
Billable
Partial atrioventricular septal defect
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Q21.22
Billable
Transitional atrioventricular septal defect
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Q21.23
Billable
Complete atrioventricular septal defect
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Q21.3
Billable
Tetralogy of Fallot
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Q21.4
Billable
Aortopulmonary septal defect
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Q21.8
Billable
Other congenital malformations of cardiac septa
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Q21.9
Billable
Congenital malformation of cardiac septum, unspecified
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Q22
Congenital malformations of pulmonary and tricuspid valves
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Q22.0
Billable
Pulmonary valve atresia
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Q22.1
Billable
Congenital pulmonary valve stenosis
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Q22.2
Billable
Congenital pulmonary valve insufficiency
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Q22.3
Billable
Other congenital malformations of pulmonary valve
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Q22.4
Billable
Congenital tricuspid stenosis
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Q22.5
Billable
Ebstein's anomaly
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Q22.6
Billable
Hypoplastic right heart syndrome
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Q22.8
Billable
Other congenital malformations of tricuspid valve
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Q22.9
Billable
Congenital malformation of tricuspid valve, unspecified
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Q23
Congenital malformations of aortic and mitral valves
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Q23.0
Billable
Congenital stenosis of aortic valve
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Q23.1
Billable
Congenital insufficiency of aortic valve
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Q23.2
Billable
Congenital mitral stenosis
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Q23.3
Billable
Congenital mitral insufficiency
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Q23.4
Billable
Hypoplastic left heart syndrome
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Q23.8
Billable
Other congenital malformations of aortic and mitral valves
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Q23.81
Billable
Bicuspid aortic valve
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Q23.82
Billable
Congenital mitral valve cleft leaflet
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Q23.88
Billable
Other congenital malformations of aortic and mitral valves
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Q23.9
Billable
Congenital malformation of aortic and mitral valves, unspecified
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Q24
Other congenital malformations of heart
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Q24.0
Billable
Dextrocardia
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Q24.1
Billable
Levocardia
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Q24.2
Billable
Cor triatriatum
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Q24.3
Billable
Pulmonary infundibular stenosis
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Q24.4
Billable
Congenital subaortic stenosis
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Q24.5
Billable
Malformation of coronary vessels
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Q24.6
Billable
Congenital heart block
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Q24.8
Billable
Other specified congenital malformations of heart
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Q24.9
Billable
Congenital malformation of heart, unspecified
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Q25
Congenital malformations of great arteries
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Q25.0
Billable
Patent ductus arteriosus
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Q25.1
Billable
Coarctation of aorta
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Q25.2
Billable
Atresia of aorta
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Q25.21
Billable
Interruption of aortic arch
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Q25.29
Billable
Other atresia of aorta
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Q25.3
Billable
Supravalvular aortic stenosis
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Q25.4
Billable
Other congenital malformations of aorta
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Q25.40
Billable
Congenital malformation of aorta unspecified
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Q25.41
Billable
Absence and aplasia of aorta
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Q25.42
Billable
Hypoplasia of aorta
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Q25.43
Billable
Congenital aneurysm of aorta
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Q25.44
Billable
Congenital dilation of aorta
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Q25.45
Billable
Double aortic arch
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Q25.46
Billable
Tortuous aortic arch
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Q25.47
Billable
Right aortic arch
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Q25.48
Billable
Anomalous origin of subclavian artery
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Q25.49
Billable
Other congenital malformations of aorta
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Updates & Changes

FY 2026 Updates

Current Year

New Codes (1)

Q23.4
Hypoplastic left heart syndrome with mitral atresia

Revised Codes (1)

Q21.0
Ventricular septal defect - updated to include hemodynamic significance when known

Deleted Codes

No codes deleted in this range for FY 2026

Historical Changes

  • •FY 2025: Routine maintenance updates with minor terminology clarifications
  • •FY 2024: Enhanced specificity requirements for certain code ranges
  • •FY 2023: Updated documentation guidelines for improved clarity

Upcoming Changes

  • •Proposed updates pending review by Coordination and Maintenance Committee
  • •Under consideration: Enhanced digital health integration codes

Implementation Guidance

  • •Review all FY 2026 updates for Q00-Q99 codes before implementation
  • •Always verify the most current codes in the ICD-10-CM manual
  • •Ensure clinical documentation supports the selected diagnosis codes
  • +3 more guidance items...

Range Overview

high priority

The ICD-10 category Q00-Q99, 'Other congenital malformations,' covers a wide range of congenital anomalies, deformities, and chromosomal abnormalities. These codes are used to document conditions present at birth, including physical abnormalities, metabolic disorders, and genetic syndromes. They are crucial for tracking birth defects, understanding their epidemiology, and planning and evaluating preventive measures.

Key Usage Points:

  • •Always code to the highest level of specificity.
  • •Use additional codes, if necessary, to identify any associated conditions.
  • •Codes from this chapter are not for use on maternal records.
  • •Use these codes only for congenital conditions, not for conditions that develop after birth.
  • •In cases of laterality, if no bilateral code is provided and the condition is bilateral, assign separate codes for both the left and right side.

Coding Guidelines

When to Use:

  • ✓When a baby is born with a physical abnormality, such as a cleft lip.
  • ✓When a newborn has a congenital metabolic disorder, like phenylketonuria.
  • ✓When a patient has a genetic syndrome present from birth, such as Down syndrome.
  • ✓When a child has a congenital deformity, like clubfoot.
  • ✓When a patient has a chromosomal abnormality, like Turner syndrome.

When NOT to Use:

  • ✗When the condition developed after birth.
  • ✗When the condition is not confirmed as congenital.
  • ✗When the condition is an acquired deformity.
  • ✗When the condition is a result of injury or trauma.
  • ✗When the condition is a result of a disease process.

Code Exclusions

Always verify exclusions in the Tabular List of the ICD-10-CM.

Documentation Requirements

Proper documentation for congenital malformations should include a detailed description of the condition, its location, and any associated conditions. The documentation should also specify if the condition is congenital and provide any relevant family history.

Clinical Information:

  • •Detailed description of the congenital malformation.
  • •Specific location of the malformation.
  • •Confirmation that the condition is congenital.
  • •Any associated conditions or complications.
  • •Relevant family history.

Supporting Evidence:

  • •Medical history records.
  • •Physical examination findings.
  • •Imaging studies.
  • •Genetic testing results.
Good Documentation Example:

Patient has a congenital malformation of the left ear, specifically microtia. The condition was present at birth. There are no associated conditions.

Poor Documentation Example:

Patient has a malformed ear.

Common Documentation Errors:

  • âš Not specifying the location of the malformation.
  • âš Not confirming the condition as congenital.
  • âš Not providing a detailed description of the malformation.
  • âš Not documenting any associated conditions.

Range Statistics

9
Total Codes
180
Billable
Complexity:
Medium
Primary Use:Clinical Documentation
Chapter:17

Coding Complexity

Medium
Complexity Rating

Coding for congenital malformations can be complex due to the need to accurately identify the specific type of malformation or abnormality, determine whether it is truly congenital, and code for any associated conditions or complications. Additionally, this code range includes many subcategories, which can make navigation challenging.

Key Factors:
  • â–¸Determining whether a condition is congenital.
  • â–¸Identifying the specific type of malformation or abnormality.
  • â–¸Coding for associated conditions or complications.
  • â–¸Understanding the specific guidelines for coding congenital conditions.
  • â–¸Navigating the many subcategories within this code range.

Specialty Focus

These codes are primarily used by pediatricians, neonatologists, and geneticists. They are also used by a variety of other specialists who treat congenital conditions, such as cardiologists, orthopedic surgeons, and ENT specialists.

Primary Specialties:
Pediatrics
40%
Neonatology
30%
Genetics
20%
Clinical Scenarios:
  • • A newborn diagnosed with Down syndrome.
  • • A baby born with a cleft lip and palate.
  • • A child with a congenital heart defect.
  • • A patient with a chromosomal abnormality, like Klinefelter syndrome.
  • • A child with a congenital metabolic disorder, like galactosemia.

Resources & References

There are several resources available for coding congenital malformations, including the official ICD-10-CM guidelines, coding manuals, and clinical reference materials.

Official Guidelines:

  • ICD-10-CM Official Guidelines for Coding and Reporting
  • American Health Information Management Association (AHIMA) coding resources
  • Centers for Disease Control and Prevention (CDC) birth defects tracking and prevention

Clinical References:

  • American Academy of Pediatrics (AAP) guidelines
  • National Organization for Rare Disorders (NORD) database

Educational Materials:

  • AHIMA ICD-10-CM coding webinars
  • AAP congenital conditions clinical resources

Frequently Asked Questions

Can I use a Q00-Q99 code for a condition that developed after birth?

No, these codes are only for congenital conditions, which are present at birth. If a condition developed after birth, it should be coded elsewhere.

What if a congenital condition is not listed in the Q00-Q99 category?

If a congenital condition is not listed in this category, it may be coded elsewhere. Always check the Tabular List and the official coding guidelines for guidance.