Chronic embolism and thrombosis of unsp subclavian vein

This code signifies a persistent or long-standing blockage within the subclavian vein due to a blood clot (thrombosis) or an embolus that has traveled from another site. This condition can impede blood flow from the arm, potentially leading to swelling, pain, and other complications in the upper extremity.

Use this code when documentation clearly indicates a chronic (not acute) thrombotic or embolic event affecting the subclavian vein, and the specific side (right or left) is not documented. This typically applies to patients presenting with ongoing symptoms related to subclavian vein occlusion, confirmed by imaging studies such as ultrasound or venography.

• Ensure the documentation specifies "chronic" to differentiate from acute events.
• Avoid using this code if the laterality (right or left subclavian vein) is clearly documented; instead, select the more specific code.
• Confirm that the subclavian vein is the affected vessel, as other upper extremity veins have distinct codes.