M21.4 - Flat foot [pes planus] (acquired) M21 - Other acquired deformities of limbs M21.4 - Flat foot [pes planus] (acquired)
M21.40 - Flat foot [pes planus] (acquired), unspecified foot M21.41 - Flat foot [pes planus] (acquired), right foot M21.42 - Flat foot [pes planus] (acquired), left foot