ICD-10 Code I82.59 – Chronic embolism and thrombosis of other specified deep vein of lower extremity (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I82.59 – Chronic embolism and thrombosis of other specified deep vein of lower extremity
What it is
This code identifies a chronic clot or embolic obstruction in a deep vein of the lower extremity that is not named in a more specific ICD-10 category. Use it when the record documents a long-standing deep vein process.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include leg swelling, pain, tenderness, or residual venous changes after prior thrombosis, but the diagnosis should be supported by provider documentation or imaging.
When to use this code
Use I82.59 when the provider documents chronic embolism or thrombosis in an unspecified other deep vein of the lower limb and no more specific code applies. It is appropriate for follow-up encounters when the condition remains active or clinically relevant. Check documentation for laterality and vein specificity if available.
Do not use for
Do not use this code for acute deep vein thrombosis, superficial vein thrombosis, or embolism sites outside the lower extremity. If the record names a more specific vein or a different phase of disease, code that instead.
Coding tip
Confirm that “chronic” is documented and that the vein location is lower-extremity deep venous, then select a more specific code if the chart provides one.