ICD-10 Code K75.1 – Phlebitis of portal vein (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K75.1 – Phlebitis of portal vein
What it is
K75.1 identifies inflammation of the portal vein, the vessel that carries blood from the digestive organs to the liver. Use it when documentation specifically states phlebitis of the portal vein.
Clinical signs
Clinical features vary; refer to documentation. Standard references describe portal vein inflammation in the setting of abdominal pain, fever, or signs of portal venous involvement, but you should code only what is documented.
When to use this code
Use K75.1 when the provider documents phlebitis, inflammation, or thrombophlebitic involvement of the portal vein. It may appear in records describing portal venous disease, often alongside an underlying cause or associated condition. Check the note for whether the portal vein is the specific vessel involved.
Do not use for
Do not use this code for general hepatitis, liver inflammation, or thrombosis of other veins without portal vein involvement. If the record is unclear, check documentation before assigning K75.1.
Coding tip
Confirm the anatomic site is the portal vein, not a portal-system complication or another venous thrombosis.