Q28

Other congenital malformations of circulatory system

Header / non-billable

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This code does not map to a risk-adjusting HCC in the loaded models.

Coding notes

Excludes 1 never coded together · Excludes 2 may co-exist

This code · Q28

Excludes 1

congenital aneurysm NOS (Q27.8) congenital coronary aneurysm (Q24.5) ruptured cerebral arteriovenous malformation (I60.8) ruptured malformation of precerebral vessels (I72.0)

Excludes 2

congenital peripheral aneurysm (Q27.8) congenital pulmonary aneurysm (Q25.79) congenital retinal aneurysm (Q14.1)

Inherited from chapter 17Congenital malformations, deformations and chromosomal abnormalities

Excludes 2

inborn errors of metabolism (E70-E88)

Note

Codes from this chapter are not for use on maternal records

Official Guidelines for Q28

FY 2026 ›

I.C.17Chapter-specific guidanceChapter 17: Congenital malformations, deformations, and chromosomal abnormalities (Q00-QA1)

Sections that reference Q28

IV.QEncounters for routine health screeningsOutpatient services
… Congenital conditions and anomalies Assign “Y” for congenital conditions and anomalies except for categories Q00- Q99, Congenital anomalies, which are on the exempt list. …

Sections whose FY 2026 text names Q28, its Q28 category, or a range containing it — the chapter guidance above is the authoritative source.