M21: Other acquired deformities of limbs
M21.4: Flat foot [pes planus] (acquired)
excludes1
congenital pes planus (Q66.5-)
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
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