Acute embolism and thrombosis of unspecified iliac vein

This code signifies the sudden blockage of an iliac vein by either an embolus (a traveling clot) or a thrombus (a clot formed in situ), where the specific iliac vein (e.g., common, external, internal) is not documented. This condition can lead to venous outflow obstruction and potentially post-thrombotic syndrome.

Use this code when documentation clearly indicates an acute venous thromboembolism affecting an iliac vein, but the laterality or specific segment of the iliac vein is not specified. Supporting documentation would include imaging reports (e.g., ultrasound, CT venography) confirming an acute thrombus or embolus in an unspecified iliac vein.

• Avoid using this code if the specific iliac vein (common, external, internal) is identified; instead, use the more specific codes within the I82.42- series.
• Ensure the documentation specifies "acute" to differentiate from chronic conditions.
• Consider sequencing this code after any underlying conditions contributing to the embolism/thrombosis, such as malignancy or hypercoagulable states.