ICD-10-CM I81 is the diagnosis code for Portal vein thrombosis. This code falls under the section "Diseases of veins, lymphatic vessels and lymph nodes, not elsewhere classified" within Chapter 9 â Diseases of the circulatory system (I00-I99). It is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
The following conditions are not included in I81. If the patient has both, code each condition separately:
Understanding where I81 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, I81 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
I81 is the ICD-10-CM diagnosis code for "Portal vein thrombosis". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
I81 is located in Section I80-I89 â "Diseases of veins, lymphatic vessels and lymph nodes, not elsewhere classified" within Chapter 9 of the ICD-10-CM Tabular List.
Use I81 when the patients documented diagnosis matches "Portal vein thrombosis" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Portal vein thrombosis is I81.
Yes, I81 can be used as a primary diagnosis code since it is billable and specific.
I81 is in Chapter 9 of the ICD-10-CM Tabular List.
Yes, I81 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.