Chronic embolism and thombos unsp calf muscular vein

This code signifies a long-standing blockage of blood flow within an unspecified muscular vein of the calf, caused by either an embolus (a traveling clot) or a thrombus (a stationary clot). This condition is chronic, indicating it has been present for an extended period rather than being acute or sudden in onset.

Use this code when documentation clearly indicates a chronic venous occlusion in an unspecified calf muscle, attributed to either an embolism or thrombosis. Supporting documentation would include imaging reports (e.g., ultrasound, venography) confirming chronic changes and the location, along with physician notes specifying the chronicity and etiology.

• Ensure the documentation specifies "chronic" and not "acute" to differentiate from acute embolism/thrombosis codes.
• Verify that the affected vein is described as a "calf muscular vein" and not a deep vein or superficial vein, which have different code assignments.
• If the laterality (right or left) is specified, use the more specific codes I82.561 (right) or I82.562 (left) instead of this unspecified code.