ICD-10 Code I82.56 – Chronic embolism and thrombosis of calf muscular vein (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I82.56 – Chronic embolism and thrombosis of calf muscular vein
What it is
This code identifies a chronic blood clot or embolus in a calf muscular vein, meaning the obstruction is in a deep vein of the lower leg and is not acute. Use it when the record clearly states the condition is chronic.
Clinical signs
Clinical features vary; refer to documentation. Chronic calf vein thrombosis may be noted on imaging, with a history of prior venous thrombosis, persistent leg swelling, pain, or post-thrombotic changes.
When to use this code
Use I82.56 when the provider documents chronic embolism or thrombosis in a calf muscular vein, such as the gastrocnemius or soleal veins. Code it from imaging reports, discharge summaries, or problem lists when chronicity is explicit. If the note only says “DVT” without location or chronic status, check documentation.
Do not use for
Do not use this code for acute calf vein thrombosis, superficial thrombophlebitis, or thrombosis in a different venous site. If the record does not specify a calf muscular vein, check documentation.
Coding tip
Confirm both chronic status and calf muscular vein location before assigning I82.56.