Peroneal tendinitis, unspecified leg

This code represents inflammation or irritation of the peroneal tendons, which are located on the outside of the ankle and foot. This condition typically causes pain along the lateral aspect of the ankle, often exacerbated by activity. It can result from overuse, improper footwear, or ankle instability.

Use this code when documentation specifies peroneal tendinitis without further laterality or specificity regarding the affected leg. This diagnosis is appropriate when the physician's notes indicate inflammation of the peroneal tendons, often presenting with pain, swelling, or tenderness in the lateral ankle region. Supporting documentation should include a physical exam finding consistent with tendinitis.

• Avoid using this code if laterality (right or left leg) is documented; instead, use the more specific codes M76.71 or M76.72.
• Ensure the documentation clearly states "tendinitis" to differentiate from other peroneal conditions like subluxation or rupture.
• Consider sequencing this code after any underlying cause, such as an ankle sprain, if applicable and documented.