ICD-10 Code for Defect
The ICD-10-CM code for defect is Q89.9 — Congenital malformation, unspecified. This is the code the Alphabetic Index gives for defect with no further qualifier, valid for FY2027 (October 1, 2026 – September 30, 2027).
BillableUnspecified
Q89.9 is billable but unspecified. If the documentation names a type, site or cause, one of the more specific codes below is likely expected.
Which defect code should you use?
The Alphabetic Index lists 121 codes under Defect, defective. Which one applies depends on the qualifier documented in the record — the type, site, cause, or associated condition. Find the qualifier below, then verify the code in the Tabular List before using it.
By type
| 3-beta-hydroxysteroid dehydrogenase | E25.0 | Congenital adrenogenital disorders associated with enzyme deficiency | |
| 11-hydroxylase | E25.0 | Congenital adrenogenital disorders associated with enzyme deficiency | |
| 21-hydroxylase | E25.0 | Congenital adrenogenital disorders associated with enzyme deficiency | |
| abdominal wall, congenital | Q79.59 | Other congenital malformations of abdominal wall | |
| antibody immunodeficiency | D80.9 | Immunodeficiency with predominantly antibody defects, unspecified | |
| aorticopulmonary septum | Q21.4 | Aortopulmonary septal defect | |
| atrial septal | Q21.10 | Atrial septal defect, unspecified | |
| auricular septal | Q21.10 | Atrial septal defect, unspecified | |
| bilirubin excretion NEC | E80.6 | Other disorders of bilirubin metabolism | |
| biosynthesis, androgen | E29.1 | Testicular hypofunction | |
| bulbar septum | Q21.0 | Ventricular septal defect | |
| catalase | E80.3 | Defects of catalase and peroxidase | |
| cell membrane receptor complex | D71.8 | Other functional disorders of polymorphonuclear neutrophils | |
| circulation | I99.9 | Unspecified disorder of circulatory system | |
| coagulation | D68.9 | Coagulation defect, unspecified | |
| complement system | D84.1 | Defects in the complement system | |
| conduction | I45.9 | Conduction disorder, unspecified | |
| coronary sinus | Q21.13 | Coronary sinus atrial septal defect | |
| cushion, endocardial | Q21.20 | Atrioventricular septal defect, unspecified as to partial or complete | |
| degradation, glycoprotein | E77.1 | Defects in glycoprotein degradation | |
| dental restoration | K08.50 | Unsatisfactory restoration of tooth, unspecified | |
| dentin | K00.5 | Hereditary disturbances in tooth structure, not elsewhere classified | |
| Descemet's membrane, congenital | Q13.89 | Other congenital malformations of anterior segment of eye | |
| ectodermal, congenital | Q82.9 | Congenital malformation of skin, unspecified | |
| Eisenmenger's | Q21.8 | Other congenital malformations of cardiac septa | |
| esophagus, congenital | Q39.9 | Congenital malformation of esophagus, unspecified | |
| extensor retinaculum | M62.89 | Other specified disorders of muscle | |
| fibrin polymerization | D68.2 | Hereditary deficiency of other clotting factors | |
| GABAmetabolic | E72.81 | Disorders of gamma aminobutyric acid metabolism | |
| Gerbode | Q21.0 | Ventricular septal defect | |
| glucose transport, blood-brain barrier | E74.810 | Glucose transporter protein type 1 deficiency | |
| glycoprotein degradation | E77.1 | Defects in glycoprotein degradation | |
| Hageman | D68.2 | Hereditary deficiency of other clotting factors | |
| high grade | F70 | Mild intellectual disabilities | |
| home, technical, preventing adequate care | Z59.19 | Other inadequate housing | |
| interatrial septal | Q21.19 | Other specified atrial septal defect | |
| interauricular septal | Q21.19 | Other specified atrial septal defect | |
| interventricular septal | Q21.0 | Ventricular septal defect | |
| intervertebral annular fibrosis | M51.9 | Unspecified thoracic, thoracolumbar and lumbosacral intervertebral disc disorder | |
| lymphocyte function antigen-1 | D84.0 | Lymphocyte function antigen-1 [LFA-1] defect | |
| lysosomal enzyme, post-translational modification | E77.0 | Defects in post-translational modification of lysosomal enzymes | |
| major osseous | M89.70 | Major osseous defect, unspecified site | |
| modification, lysosomal enzymes, post-translational | E77.0 | Defects in post-translational modification of lysosomal enzymes | |
| osseous, major | M89.70 | Major osseous defect, unspecified site | |
| osteochondral NEC | M95.8 | Other specified acquired deformities of musculoskeletal system | |
| peroxidase | E80.3 | Defects of catalase and peroxidase | |
| platelets, qualitative | D69.19 | Other qualitative platelet defects | |
| renal pelvis | Q63.8 | Other specified congenital malformations of kidney | |
| respiratory system, congenital | Q34.9 | Congenital malformation of respiratory system, unspecified | |
| restoration, dental | K08.50 | Unsatisfactory restoration of tooth, unspecified | |
| retinal nerve bundle fibers | H35.89 | Other specified retinal disorders | |
| septalNOS | Q21.9 | Congenital malformation of cardiac septum, unspecified | |
| sinus venosus | Q21.16 | Sinus venosus atrial septal defect, unspecified | |
| Taussig-Bing | Q20.1 | Double outlet right ventricle | |
| teeth, wedge | K03.1 | Abrasion of teeth | |
| vascular | I99.9 | Unspecified disorder of circulatory system | |
| ventricular septal | Q21.0 | Ventricular septal defect | |
| vision NEC | H54.7 | Unspecified visual loss | |
| visual field | H53.40 | Unspecified visual field defects | |
| voice | R49.9 | Unspecified voice and resonance disorder | |
| wedge, tooth, teeth | K03.1 | Abrasion of teeth |
Defect atrial septal
| coronary sinus | Q21.13 | Coronary sinus atrial septal defect | |
| following acute myocardial infarction | I23.1 | Atrial septal defect as current complication following acute myocardial infarction | |
| ostium primum type | Q21.20 | Atrioventricular septal defect, unspecified as to partial or complete | |
| ostium secundum type | Q21.11 | Secundum atrial septal defect | |
| sinus venosus | Q21.16 | Sinus venosus atrial septal defect, unspecified | |
| specified NEC | Q21.19 | Other specified atrial septal defect |
Defect atrioventricular
Defect circulation
Defect coagulation
| acquired | D68.4 | Acquired coagulation factor deficiency | |
| hereditary NEC | D68.2 | Hereditary deficiency of other clotting factors | |
| intrapartum | O67.0 | Intrapartum hemorrhage with coagulation defect | |
| newborn, transient | P61.6 | Other transient neonatal disorders of coagulation | |
| postpartum | O99.13 | Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating the puerperium | |
| specified type NEC | D68.8 | Other specified coagulation defects |
Defect cushion, endocardial
Defect dental restoration
| specified NEC | K08.59 | Other unsatisfactory restoration of tooth |
Defect developmental
| cauda equina | Q06.3 | Other congenital cauda equina malformations |
Defect diaphragm
| congenital | Q79.1 | Other congenital malformations of diaphragm |
Defect enzyme
Defect filling
| bladder | R93.41 | Abnormal radiologic findings on diagnostic imaging of renal pelvis, ureter, or bladder | |
| kidney | R93.42 | Abnormal radiologic findings on diagnostic imaging of kidney | not billable |
| renal pelvis | R93.41 | Abnormal radiologic findings on diagnostic imaging of renal pelvis, ureter, or bladder | |
| stomach | R93.3 | Abnormal findings on diagnostic imaging of other parts of digestive tract | |
| ureter | R93.41 | Abnormal radiologic findings on diagnostic imaging of renal pelvis, ureter, or bladder | |
| urinary organs, specified NEC | R93.49 | Abnormal radiologic findings on diagnostic imaging of other urinary organs |
Defect interventricular septal
Defect intervertebral annular fibrosis
Defect major osseous
| ankle | M89.77 | Major osseous defect, ankle and foot | not billable |
| carpus | M89.74 | Major osseous defect, hand | not billable |
| clavicle | M89.71 | Major osseous defect, shoulder region | not billable |
| femur | M89.75 | Major osseous defect, pelvic region and thigh | not billable |
| fibula | M89.76 | Major osseous defect, lower leg | not billable |
| fingers | M89.74 | Major osseous defect, hand | not billable |
| foot | M89.77 | Major osseous defect, ankle and foot | not billable |
| forearm | M89.73 | Major osseous defect, forearm | not billable |
| hand | M89.74 | Major osseous defect, hand | not billable |
| humerus | M89.72 | Major osseous defect, humerus | not billable |
| lower leg | M89.76 | Major osseous defect, lower leg | not billable |
| metacarpus | M89.74 | Major osseous defect, hand | not billable |
| metatarsus | M89.77 | Major osseous defect, ankle and foot | not billable |
| multiple sites | M89.79 | Major osseous defect, multiple sites | |
| pelvic region | M89.75 | Major osseous defect, pelvic region and thigh | not billable |
| pelvis | M89.75 | Major osseous defect, pelvic region and thigh | not billable |
| radius | M89.73 | Major osseous defect, forearm | not billable |
| scapula | M89.71 | Major osseous defect, shoulder region | not billable |
| shoulder region | M89.71 | Major osseous defect, shoulder region | not billable |
| specified NEC | M89.78 | Major osseous defect, other site | |
| tarsus | M89.77 | Major osseous defect, ankle and foot | not billable |
| thigh | M89.75 | Major osseous defect, pelvic region and thigh | not billable |
| tibia | M89.76 | Major osseous defect, lower leg | not billable |
| toes | M89.77 | Major osseous defect, ankle and foot | not billable |
Index terms and codes are reproduced from the official ICD-10-CM FY2027 release. The Alphabetic Index is a finding aid — a code must always be verified in the Tabular List before it is reported. Data sources