Chronic embolism and thrombosis of subclav vein, bilateral

This code signifies the persistent presence of blood clots within both the left and right subclavian veins. These clots obstruct blood flow, leading to chronic symptoms such as swelling, pain, and discoloration in the upper extremities. The condition is distinct from acute events, indicating a longer-standing or recurrent thrombotic process.

Apply this code when documentation clearly indicates chronic (long-standing or recurrent) embolism or thrombosis affecting both subclavian veins. This diagnosis is typically supported by imaging studies (e.g., venography, duplex ultrasound) confirming the bilateral chronic nature of the clots. It is often seen in patients with underlying hypercoagulable states, thoracic outlet syndrome, or indwelling central venous catheters.

• Ensure documentation specifies "chronic" and "bilateral" involvement of the subclavian veins; otherwise, consider acute or unilateral codes.
• Distinguish from acute subclavian vein thrombosis (I82.22-) which has different clinical implications and treatment.
• Code any underlying conditions contributing to the thrombosis (e.g., hypercoagulable state, malignancy) as additional diagnoses.