Chronic embolism and thrombosis of iliac vein, bilateral

This code signifies the presence of a long-standing blood clot (thrombosis) or an embolus within both the left and right iliac veins. This chronic condition can lead to persistent venous insufficiency, pain, and swelling in the lower extremities.

Apply this code when documentation explicitly states chronic embolism or thrombosis affecting both iliac veins. This diagnosis is typically supported by imaging studies such as venography, CT angiography, or duplex ultrasound confirming the bilateral, chronic nature of the occlusion.

• Distinguish between acute and chronic conditions; this code is specifically for chronic presentations.
• Ensure documentation specifies bilateral involvement of the iliac veins. Unilateral involvement requires a different code.
• Consider any underlying causes or associated conditions (e.g., May-Thurner syndrome, hypercoagulable states) for additional coding.