ICD-10 Code I82.5Y9 – Chronic embolism and thrombosis of unspecified deep veins of unspecified proximal lower extremity (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I82.5Y9 – Chronic embolism and thrombosis of unspecified deep veins of unspecified proximal lower extremity
What it is
This code identifies a chronic, not acute, embolism or thrombosis in a deep vein of the proximal lower extremity, when the exact vein is not specified. Use it for persistent clot-related disease in the thigh or groin region.
Clinical signs
Clinical features vary; refer to documentation. Commonly, records may note chronic leg swelling, pain, heaviness, skin discoloration, or a history of prior deep vein thrombosis with ongoing venous obstruction.
When to use this code
Use this code when the provider documents a chronic deep venous clot or embolic process in an unspecified proximal lower-extremity vein. It fits follow-up encounters where the condition is still present and not described as acute or resolved.
Choose it when the chart does not identify a more specific vein or laterality detail, but does support chronic proximal DVT involvement. Check documentation if the record only mentions past history without current disease.
Do not use for
Do not use this code for acute DVT, superficial vein thrombosis, or embolism in other vascular territories. Do not use it if the documentation clearly identifies a more specific vein or a different chronicity.
Coding tip
Confirm both chronic status and proximal lower-extremity location before assigning I82.5Y9.