Congenital malformations of the circulatory system (Q20-Q28) ICD-10-CM
The Q20–Q28 section covers congenital malformations of the circulatory system with 118 ICD-10-CM diagnosis codes, of which 102 are billable in fiscal year 2026. The section is organized into the 9 code ranges listed below.
Code Ranges in This Section 9 ranges · 118 codes
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the Q20–Q28 Code Range
ICD-10 codes Q20-Q28 are used to classify congenital malformations of the circulatory system, encompassing a wide range of heart and blood vessel abnormalities present from birth. These codes cover specific defects in cardiac chambers, septa, valves, great arteries and veins, peripheral vascular system, and miscellaneous circulatory malformations.
This group includes well-known conditions such as common arterial trunk (Q20.0, also called truncus arteriosus), double outlet right ventricle (Q20.1), ventricular septal defects (Q21.0), atrial septal defects (Q21.1), and tetralogy of Fallot (Q21.3). Synonymous terms such as Ebstein’s anomaly (Q22.5), patent ductus arteriosus (Q25.0), and bicuspid aortic valve (Q23.81) are mapped clearly to their respective codes to aid accurate coding. Valve malformations include stenosis and insufficiency of pulmonary, tricuspid, aortic, and mitral valves. The range also covers anomalies of great arteries like coarctation of aorta (Q25.1), interruption of aortic arch (Q25.21), and double aortic arch (Q25.45). Additionally, it includes malformations of great veins such as persistent left superior vena cava (Q26.1) and complex peripheral vascular anomalies like congenital absence or hypoplasia of umbilical artery (Q27.0) and arteriovenous malformations at various sites (Q27.3, Q28.0, Q28.2). Specified and unspecified forms allow for detailed or general coding, facilitating precise documentation of congenital cardiovascular conditions for both clinical understanding and medical coding purposes.
Questions About This Page
How many codes are in the Q20-Q28 range?
The Q20-Q28 range contains 118 ICD-10-CM diagnosis codes in FY 2026. 102 of them are billable, and the rest are category headers that organize the section.
What conditions does Q20-Q28 cover?
The range covers congenital malformations of the circulatory system. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
