Portal vein thrombosis (I81) ICD-10-CM
The I81 code range covers portal vein thrombosis with 1 ICD-10-CM diagnosis codes. 1 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
- Portal (vein) obstruction
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Codes in the I81 Range 1 codes · 1 billable
- I81 Portal vein thrombosis
About the I81 Code Range
The ICD-10 code I81 is specifically used for diagnosing and coding cases of portal vein thrombosis, a condition involving a blood clot in the portal vein which can lead to serious complications in blood flow from the intestines to the liver.
This code covers various related conditions including chronic and acute thrombosis of the mesenteric vein, which can cause visceral ischemia—reduced blood supply to internal organs such as the intestines. Synonyms like "portal vein obstruction," "acute occlusion of mesenteric vein," and "acute vascular insufficiency of intestine" all fall under this code, helping medical coders identify this condition accurately, even when alternative terms are used. Understanding that these different terms describe the same underlying vascular issue ensures proper documentation and coding when encountering gastrointestinal vascular insufficiency or ischemia caused by thrombosis in the portal or mesenteric veins.
Questions About This Page
How many billable codes are in the I81 range?
Of the 1 codes in this range, 1 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the I81 range classify?
The range classifies portal vein thrombosis. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
