I81

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I81

Billable

Portal vein thrombosis

I81 is the ICD-10-CM code for Portal vein thrombosis. It is a billable, specific code valid for reimbursement.

Status
Billable
Chapter
I00-I99
Edition
FY2026

I00-I99 Diseases of the circulatory system

What this means — in plain language

MedlinePlus · NIH

Deep vein thrombosis, or DVT, is a blood clot that forms in a vein deep in the body. Most deep vein clots occur in the lower leg or thigh. If the vein swells, the condition is called thrombophlebitis. A deep vein thrombosis can break loose and cause a serious problem in the lung, called a pulmonary embolism . Sitting still for a long time can make you more likely to get a DVT. Some medicines and disorders that…

Read more about Deep Vein Thrombosis at MedlinePlus ↗

Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.

Includes

  • Portal (vein) obstruction

Excludes2 — not included here

  • hepatic vein thrombosis (I82.0)
  • phlebitis of portal vein (K75.1)

Frequently asked questions

What is ICD-10 code I81?
I81 is the ICD-10-CM code for "Portal vein thrombosis". It falls under I00-I99 Diseases of the circulatory system.
Is I81 a billable code?
Yes — I81 is a billable, specific ICD-10-CM code valid for reimbursement.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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