ICD-10 Code I82.599 – Chronic Embolism and Thrombosis of Other Specified Deep Vein of Unspecified Lower Extremity (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I82.599 – Chronic embolism and thrombosis of other specified deep vein of unspecified lower extremity
What it is
This code identifies a chronic blood clot or embolus in a deep vein of the lower leg or thigh that is not otherwise specified and is not tied to a left or right side. Use it when the record documents an ongoing, old venous clot.
Clinical signs
Clinical features vary; refer to documentation. Common findings in chronic deep vein disease may include leg swelling, discomfort, skin discoloration, or a history of prior venous thrombosis confirmed by imaging or provider assessment.
When to use this code
Use I82.599 when the provider documents chronic embolism or thrombosis in an unspecified lower-extremity deep vein and does not name the exact vein or laterality. It also fits when the condition is described as persistent or old rather than acute. Check documentation if the chart only says “DVT” without chronicity.
Do not use for
Do not use this code for acute deep vein thrombosis, superficial vein thrombosis, or embolism in a named vein that is separately specified. If the record identifies right or left side, use the more specific code.
Coding tip
Confirm chronicity, vein type, and laterality in the note before assigning this code.