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I81 ICD-10-CM Code: Portal vein thrombosis

A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.

Official description

I81

Portal vein thrombosis

ICD-10-CM diagnosis code · United States clinical modification

Where I81 sits

  1. 1

    Chapter 9

    Diseases of the circulatory system (I00-I99)

  2. 2

    Section

    Diseases of veins, lymphatic vessels and lymph nodes, not elsewhere classified (I80-I89)

  3. 3

    Category I81

    Portal vein thrombosis

  4. 4

    Code I81

    Portal vein thrombosis

Notes for this code

Inclusion terms

  • Portal (vein) obstruction

Code first

No “code first” instruction is listed for I81.

Use additional code

No “use additional code” instruction is listed for I81.

Excludes1

Conditions that should not be reported together with this code.

No Excludes1 note is listed for I81.

Excludes2

Conditions not included here that may be reported separately when present.

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

Source and release

Data release
U.S. ICD-10-CM · FY 2027
Effective date
Oct 1, 2026

This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.

Review the CDC/NCHS ICD-10-CM source

Frequently asked questions

What does ICD-10-CM code I81 mean?

I81 is the FY 2027 U.S. ICD-10-CM code for “Portal vein thrombosis.”

Is I81 a billable or specific ICD-10-CM code?

Yes. In the FY 2027 reference data used on this page, I81 has no child codes and is presented as a billable/specific code. Always confirm the active code set and payer requirements before use.

Where is I81 located in ICD-10-CM?

I81 is listed in Chapter 9, Diseases of the circulatory system (I00-I99), within Diseases of veins, lymphatic vessels and lymph nodes, not elsewhere classified (I80-I89) (I80–I89), under category I81, Portal vein thrombosis.

What coding notes are listed for I81?

Its listed inclusion terms are Portal (vein) obstruction. No code-first instruction is listed. No Excludes1 note is listed. Excludes2 notes: hepatic vein thrombosis (I82.0); phlebitis of portal vein (K75.1).