ICD-10-CM > Q00-QA0 > Q65-Q79 > Q66 > Q66.5 Q66.5 Congenital pes planus Non-Billable/Non-Specific Applicable To Congenital flat footCongenital rigid flat footCongenital spastic (everted) flat foot Type 1 Excludes pes planus, acquired (M21.4) Codes Q66.50Congenital pes planus, unspecified footQ66.51Congenital pes planus, right footQ66.52Congenital pes planus, left foot