Chronic embolism and thrombosis of unspecified iliac vein

This code signifies a long-standing blockage within an iliac vein due to a blood clot (thrombus) or an embolus, where the specific iliac vein (e.g., common, external, internal) is not documented. This chronic obstruction can lead to impaired venous return from the lower extremity.

Use this code when documentation clearly indicates a chronic (not acute) embolism or thrombosis affecting an iliac vein, and the physician's notes do not specify which particular iliac vein is involved. Supporting documentation would include imaging reports (e.g., venography, duplex ultrasound) confirming a chronic occlusion in an unspecified iliac vein.

• Distinguish carefully between acute (I82.22-) and chronic (I82.52-) conditions; documentation must support chronicity.
• Avoid using this unspecified code if the specific iliac vein (common, external, or internal) is identified in the medical record; instead, use the more specific codes (I82.521, I82.522, I82.523).
• Always review laterality if specified in the documentation, as this code is for an unspecified side.