Q66.9Congenital deformity of feet, unspecified

Q66.9 is the ICD-10-CM diagnosis code for congenital deformity of feet, unspecified. It belongs to category Q66 (congenital deformities of feet), block Q65-Q79 (congenital malformations and deformations of the musculoskeletal system) and chapter 17 (congenital malformations, deformations, chromosomal abnormalities, and genetic disorders). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within Q66, choose Q66.9 (Congenital deformity of feet, unspecified) only when documentation doesn't support a more specific option: congenital talipes equinovarus (Q66.0), congenital talipes calcaneovarus (Q66.1), congenital metatarsus (primus) varus (Q66.2), other congenital varus deformities of feet (Q66.3), congenital talipes calcaneovalgus (Q66.4), congenital pes planus (Q66.5), other congenital valgus deformities of feet (Q66.6), congenital pes cavus (Q66.7) and 1 more.

To report this condition, pick the subcode that matches the documentation: Q66.90 (unspecified foot), Q66.91 (right foot) and Q66.92 (left foot).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015, and changed in FY2020 (expanded into subcodes).

Before ICD-10, this condition was coded in ICD-9-CM as 754.79 (other deformities of feet).