Q27.8 ICD-10-CM Code: Other specified congenital malformations of peripheral vascular system
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FY 2026 Apr update / Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0) / Congenital malformations of the circulatory system (Q20-Q28)
Q27.8
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceOther specified congenital malformations of peripheral vascular system
A birth defect involving abnormal development of blood vessels in the arms, legs, or other peripheral areas that doesn't fit into more specific categories.
CMS-HCC V28
00
RAF 0
CMS-HCC V24
00
RAF 0
ACA/HHS
00
RAF 0
ESRD/PACE
00
RAF 0
RXHCC
00
RAF 0
Code Trumping
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Code Book Path
Inclusion Terms
Official- Absence of peripheral vascular system
- Atresia of peripheral vascular system
- Congenital aneurysm (peripheral)
- Congenital stricture, artery
- Congenital varix
Excludes 2
Official- anomalies of cerebral and precerebral vessels (Q28.0-Q28.3)
- anomalies of coronary vessels (Q24.5)
- anomalies of pulmonary artery (Q25.5-Q25.7)
- congenital retinal aneurysm (Q14.1)
- hemangioma and lymphangioma (D18.-)
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for Q27.8 in this effective period.
Excludes 1
Official- arteriovenous malformation (Q27.3-)
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for Q27.8 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for Q27.8 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for Q27.8 in this effective period.
Buddy Documentation Tip
Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.
Is Q27.8 an HCC code?
No. Q27.8 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
Coder workflow notes
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This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
Q27.8 is the ICD-10-CM diagnosis code for other specified congenital malformations of peripheral vascular system. A birth defect involving abnormal development of blood vessels in the arms, legs, or other peripheral areas that doesn't fit into more specific categories. Q27.8 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).
Q27.8 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
Use this code only when the specific type of peripheral vascular malformation is documented but doesn't match Q27.0-Q27.7.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for Q27.8 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
Excludes 1, Do NOT code together
- arteriovenous malformation (Q27.3-)