Q27.4
BillableCongenital phlebectasia
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is Q27.4 an HCC code?
No. Q27.4 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
Q27.4 is the ICD-10-CM diagnosis code for congenital phlebectasia. A congenital condition where veins are abnormally dilated or enlarged from birth, typically affecting blood vessels outside the brain and heart. Q27.4 sits in the ICD-10-CM chapter for congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (q00-qa0), within the section covering congenital malformations of the circulatory system (q20-q28).
Q27.4 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.
Specify the location of phlebectasia when documented (e.g., limb, trunk).
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for Q27.4 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Specify the location of phlebectasia when documented (e.g., limb, trunk)
- •Distinguish from acquired venous dilation to ensure correct code selection