Flat foot [pes planus] (acquired), right foot

This code represents an acquired flattening of the arch of the right foot, also known as pes planus. This condition can develop due to various factors such as ligamentous laxity, muscle weakness, or trauma, leading to a loss of the medial longitudinal arch. Patients often experience pain, fatigue, and altered gait mechanics.

Use this code when documentation clearly indicates an acquired flat foot affecting the right foot. This diagnosis is typically supported by physical examination findings, patient history of symptoms, and sometimes imaging studies confirming the loss of the arch. Ensure the provider specifies "acquired" to differentiate from congenital forms.

• Distinguish between acquired (M21.4-) and congenital (Q66.5-) flat foot; documentation must specify "acquired."
• Laterality is crucial; ensure the right foot is explicitly documented.
• Do not use this code for flexible flat foot without symptoms or functional impairment unless specifically diagnosed as acquired pes planus.