Is ICD-10-CM code I81 billable?

Yes, I81 (Portal vein thrombosis) is a billable ICD-10-CM diagnosis code, valid for reimbursement on HIPAA-covered transactions for FY2026.

What chapter does ICD-10-CM code I81 belong to?

I81 belongs to Chapter 9 of the ICD-10-CM tabular list: I00–I99 (Diseases of the Circulatory System).

I81

Billable

ChapterI00–I99

Rankcategory

Description

Portal vein thrombosis

About ICD-10-CM code I81

Portal vein thrombosis is classified in ICD-10-CM as code I81, part of I00-I99 Diseases of the Circulatory System, within Diseases of veins, lymphatic vessels and lymph nodes, not elsewhere classified (I80-I89). Its status is billable, meaning it is valid for reimbursement claims.

Metadata & Insights

•Billable/specific code (valid for reimbursement).
•Chapter 9: Diseases of the Circulatory System (I00-I99).

CH9 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)

certain conditions originating in the perinatal period (P04-P96)
certain infectious and parasitic diseases (A00-B99)
complications of pregnancy, childbirth and the puerperium (O00-O9A)
congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
endocrine, nutritional and metabolic diseases (E00-E88)
injury, poisoning and certain other consequences of external causes (S00-T88)
neoplasms (C00-D49)
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
systemic connective tissue disorders (M30-M36)
transient cerebral ischemic attacks and related syndromes (G45.-)