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 2027. 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
These conditions involve differences in the heart or blood vessels present at birth.
The heart categories separate chambers and connections (Q20), walls between chambers (Q21), and valves. The valve categories distinguish pulmonary and tricuspid valves (Q22) from aortic and mitral valves (Q23). Q24 groups other heart malformations.
The remaining categories distinguish great arteries (Q25), great veins (Q26), peripheral blood vessels (Q27), and other circulatory malformations, including those of vessels leading to or within the brain (Q28).
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 2027. 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 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
