Q66Congenital deformities of feet

Q66 is the ICD-10-CM diagnosis code for congenital deformities of feet. It belongs to 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 10 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: Q66.0 (equinovarus), Q66.1 (calcaneovarus), Q66.2 (varus), Q66.3 (feet), Q66.4 (calcaneovalgus), Q66.5 (planus), Q66.6 (feet), Q66.7 (cavus) and 2 more.

Don't report Q66 together with the conditions in its Excludes1 note: reduction defects of feet (Q72.-), valgus deformities (acquired) (M21.0-) and varus deformities (acquired) (M21.1-).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.