Posterior tibial tendinitis, unspecified leg

This code represents inflammation of the posterior tibial tendon, a common cause of foot and ankle pain, particularly along the inner aspect of the ankle and arch. It often presents as pain with activity, swelling, and tenderness along the tendon's course. This specific code is used when the affected leg is not documented.

Use this code when documentation clearly indicates posterior tibial tendinitis but does not specify laterality (left or right leg). This diagnosis is frequently seen in athletes, individuals with flat feet, or those with repetitive ankle stress. Supporting documentation includes physical exam findings of tenderness, swelling, and pain with resisted inversion or plantarflexion.

• Only use this code when laterality is truly unspecified; otherwise, select the more specific code for left or right leg.
• Differentiate from other foot/ankle tendinopathies (e.g., Achilles tendinitis, peroneal tendinitis) based on anatomical location and specific tendon involvement.
• Consider co-occurring conditions like pes planus (flat foot) which can predispose to posterior tibial tendinitis.