I81

ICD-10Billable

Portal vein thrombosis

Official ICD-10-CM descriptor (FY2026)

Portal vein thrombosis

I81 is valid for submission on a claim — CMS flags it as a billable, specific code.

Inclusion terms

  • Portal (vein) obstruction

Excludes2

Not included here. The condition is not part of this code, but a patient may have both, and both codes may be reported together.

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

Where this code sits

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Source

ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.

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