ICD-10 Code I82.503 – Chronic embolism and thrombosis of unspecified deep veins of lower extremity, bilateral (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I82.503 – Chronic embolism and thrombosis of unspecified deep veins of lower extremity, bilateral
What it is
This code identifies a chronic blood clot or embolic blockage in the deep veins of both lower extremities when the exact vein is not specified. It is used when the condition is longstanding rather than acute.
Clinical signs
Findings may include persistent leg swelling, discomfort, heaviness, or skin changes consistent with chronic venous disease. Clinical features vary; refer to documentation.
When to use this code
Use I82.503 when the record documents chronic thrombosis or embolism affecting deep veins in both legs, but does not identify a specific deep vein. It may be supported by imaging, prior history, or provider assessment of chronic DVT. You should code it only when bilateral involvement is clearly stated.
Do not use for
Do not use this code for acute deep vein thrombosis, superficial vein thrombosis, or when only one leg is involved. Check documentation if the laterality, acuity, or vein location is unclear.
Coding tip
Confirm both chronicity and bilateral lower-extremity involvement before assigning I82.503.