Peroneal tendinitis, left leg

This code signifies inflammation of the peroneal tendons in the left leg, typically presenting as pain and swelling along the outer ankle and foot. Peroneal tendinitis often results from overuse, repetitive ankle motion, or inadequate footwear, affecting the tendons responsible for eversion and plantarflexion of the foot.

Apply this code when documentation explicitly states peroneal tendinitis affecting the left lower extremity. This diagnosis is commonly made based on physical examination findings, such as tenderness along the peroneal tendons, pain with resisted eversion, and sometimes swelling. Imaging studies like MRI may confirm the diagnosis and rule out other pathologies.

• Ensure laterality is clearly documented as "left leg" or "left ankle" to support this specific code.
• Differentiate from other ankle/foot tendinitis codes (e.g., Achilles, posterior tibial) based on the specific tendon involved.
• Look for documentation of the cause, such as overuse or trauma, which may support additional external cause codes if applicable.