ICD-10-CM 2027
ICD-10 code for heart anomaly
From the official ICD-10-CM alphabetic index entry “Anomaly, anomalous (congenital) (unspecified type) › heart”. Page updated September 29, 2026.
About coding heart anomaly
The ICD-10-CM code for heart anomaly is Q24.9 (Congenital malformation of heart, unspecified). The official index lists 30 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on Q24.9.
Within Q24, choose Q24.9 (Congenital malformation of heart, unspecified) only when documentation doesn't support a more specific option: Dextrocardia (Q24.0), Levocardia (Q24.1), cor triatriatum (Q24.2), pulmonary infundibular stenosis (Q24.3), congenital subaortic stenosis (Q24.4), malformation of coronary vessels (Q24.5), congenital heart block (Q24.6) and other specified congenital malformations of heart (Q24.8).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 306 (Cardiac Congenital and Valvular Disorders with MCC, relative weight 1.546) and DRG 307 (Cardiac Congenital and Valvular Disorders without MCC, relative weight 0.9148), in MDC 05 (Diseases and Disorders of the Circulatory System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific heart anomaly codes (official index)
- auricle Q20.8 — Other congenital malformations of cardiac chambers and connections
- bands or folds Q24.8 — Other specified congenital malformations of heart
- fibroelastosis cordis I42.4 — Endocardial fibroelastosis
- obstructive NEC Q22.6 — Hypoplastic right heart syndrome
- patent ductus arteriosus (Botalli) Q25.0 — Patent ductus arteriosus
- septum Q21.9 — Congenital malformation of cardiac septum, unspecified
- auricular Q21.19 — Other specified atrial septal defect
- interatrial Q21.19 — Other specified atrial septal defect
- interventricular Q21.0 — Ventricular septal defect
- with pulmonary stenosis or atresia, dextraposition of aorta and hypertrophy of right ventricle Q21.3 — Tetralogy of Fallot
- specified NEC Q21.8 — Other congenital malformations of cardiac septa
- ventricular Q21.0 — Ventricular septal defect
- with pulmonary stenosis or atresia, dextraposition of aorta and hypertrophy of right ventricle Q21.3 — Tetralogy of Fallot
- tetralogy of Fallot Q21.3 — Tetralogy of Fallot
- valve NEC Q24.8 — Other specified congenital malformations of heart
- aortic
- bicuspid valve Q23.81 — Bicuspid aortic valve
- functional, with stenosis
- insufficiency Q23.1 — Congenital insufficiency of aortic valve
- stenosis Q23.0 — Congenital stenosis of aortic valve
- subaortic Q24.4 — Congenital subaortic stenosis
- mitral
- insufficiency Q23.3 — Congenital mitral insufficiency
- stenosis Q23.2 — Congenital mitral stenosis
- pulmonary Q22.3 — Other congenital malformations of pulmonary valve
- atresia Q22.0 — Pulmonary valve atresia
- insufficiency Q22.2 — Congenital pulmonary valve insufficiency
- stenosis Q22.1 — Congenital pulmonary valve stenosis
- infundibular Q24.3 — Pulmonary infundibular stenosis
- subvalvular Q24.3 — Pulmonary infundibular stenosis
- tricuspid
- atresia Q22.4 — Congenital tricuspid stenosis
- stenosis Q22.4 — Congenital tricuspid stenosis
- ventricle Q20.8 — Other congenital malformations of cardiac chambers and connections
Common questions about heart anomaly ICD-10 codes
What is the ICD-10 code for heart anomaly?
- Q24.9 — Congenital malformation of heart, unspecified. More specific codes apply when the documentation supports them: Q20.8, Q24.8, I42.4, Q22.6 and others below.
What is the ICD-10 code for auricle heart anomaly?
- Q20.8 — Other congenital malformations of cardiac chambers and connections.
What is the ICD-10 code for bands or folds heart anomaly?
- Q24.8 — Other specified congenital malformations of heart.
What is the ICD-10 code for fibroelastosis cordis heart anomaly?
- I42.4 — Endocardial fibroelastosis.
What is the ICD-10 code for obstructive nec heart anomaly?
- Q22.6 — Hypoplastic right heart syndrome.
What is the ICD-10 code for patent ductus arteriosus heart anomaly?
- Q25.0 — Patent ductus arteriosus.
What is the ICD-10 code for septum heart anomaly?
- Q21.9 — Congenital malformation of cardiac septum, unspecified.
Is Q24.9 billable?
- Yes. Q24.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Q24.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict Q24.9 as a principal diagnosis.
Is Q24.9 a CC or MCC?
- No. Q24.9 is neither a CC nor an MCC under MS-DRG v44.0.