Q28 ICD-10-CM Code: Other congenital malformations of circulatory system
Q28 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · free HCC coding tools
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FY 2026 Apr update / Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0) / Congenital malformations of the circulatory system (Q20-Q28)
Q28
Header CodeICD-10-CMOfficial ICD-10-CMCodebook guidanceOther congenital malformations of circulatory system
Other congenital malformations of circulatory system
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for Q28 in this effective period.
Excludes 2
Official- congenital peripheral aneurysm (Q27.8)
- congenital pulmonary aneurysm (Q25.79)
- congenital retinal aneurysm (Q14.1)
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for Q28 in this effective period.
Excludes 1
Official- congenital aneurysm NOS (Q27.8)
- congenital coronary aneurysm (Q24.5)
- ruptured cerebral arteriovenous malformation (I60.8)
- ruptured malformation of precerebral vessels (I72.0)
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for Q28 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for Q28 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for Q28 in this effective period.
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
- Code
- Q28
- Description
- Other congenital malformations of circulatory system
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF reference coefficient
- —
- Billable
- No
- Payment year
- 2026
Coder workflow notes
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What This Code Means
Q28 is the ICD-10-CM diagnosis code for other congenital malformations of circulatory system. Q28 sits in the ICD-10-CM chapter for congenital malformations, deformations and chromosomal abnormalities (q00-qa0), within the section covering congenital malformations of the circulatory system (q20-q28).
Header codes like Q28 cannot be reported on claims directly; they organize child codes that share clinical context. Coders should select the billable child code that matches the documented presentation and then verify its current source-backed HCC mapping. Do not infer a child code or risk adjustment value from the header alone.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for Q28 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.