I81
✓ Billable
Portal vein thrombosis
ICD-10-CM · FY2026 · Diseases of the Circulatory System
Code
I81
System
ICD-10-CM
Billable
Yes — valid for submission
Effective
FY2026
Chapter
Diseases of the Circulatory System
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Official coding notes
From CMS's ICD-10-CM Tabular List.
Also known as
- Portal (vein) obstruction
Excludes2 — not included here, but may code together
- hepatic vein thrombosis (I82.0)
- phlebitis of portal vein (K75.1)
Frequently asked questions
What is ICD-10 code I81?
ICD-10-CM code I81 represents Portal vein thrombosis. It is a billable diagnosis code in the Diseases of the Circulatory System chapter, effective October 1, 2025 – September 30, 2026.
Is I81 billable?
Yes. I81 is a valid billable ICD-10-CM code for insurance claims and clinical documentation.
What chapter is I81 in?
I81 belongs to the Diseases of the Circulatory System chapter (I00–I99) of ICD-10-CM.
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