ICD-10-CM > Q00-QA0 > Q65-Q79 > Q66 > Q66.9 Q66.9 Congenital deformity of feet, unspecified Non-Billable/Non-Specific Codes Q66.90Congenital deformity of feet, unspecified, unspecified footQ66.91Congenital deformity of feet, unspecified, right footQ66.92Congenital deformity of feet, unspecified, left foot