Acute embolism and thombos unsp calf muscular vein

This code represents a sudden blockage (embolism) or formation of a blood clot (thrombosis) within an unspecified muscular vein of the calf, occurring acutely. It indicates an acute venous thromboembolism affecting the deep veins of the lower leg, specifically within the muscle tissue rather than the main superficial or deep venous trunks.

Use this code when documentation clearly indicates an acute deep vein thrombosis (DVT) or embolism localized to a muscular vein of the calf, and the specific muscular vein (e.g., gastrocnemius, soleus) is not identified. This code is appropriate when imaging studies (e.g., ultrasound) confirm a thrombus in a calf muscular vein, and the onset is recent.

• Ensure documentation specifies "acute" to differentiate from chronic conditions.
• Avoid using this code if the specific calf muscular vein (e.g., gastrocnemius vein) is identified; a more specific code from the I82.46- subcategory should be used.
• Always sequence this code as a primary diagnosis when it is the reason for the encounter, unless another condition is the principal diagnosis requiring treatment.