Chronic embolism and thrombosis of left subclavian vein

This code signifies the persistent presence of a blood clot within the left subclavian vein, obstructing blood flow. This condition is chronic, indicating a long-standing or recurrent nature of the embolism or thrombosis rather than an acute event.

Apply this code when documentation clearly states a chronic embolism or thrombosis specifically affecting the left subclavian vein. This typically involves imaging reports (e.g., ultrasound, venography) confirming the presence and chronicity of the clot in this specific vessel.

• Differentiate carefully between acute and chronic conditions; this code is exclusively for chronic presentations.
• Ensure the documentation specifies the left subclavian vein; laterality is crucial for accurate coding.
• Consider sequencing this code as a primary diagnosis if it is the main reason for the encounter, or as a secondary diagnosis if it's a co-morbidity impacting treatment.