Q66 – Congenital deformities of feet

ICD-10-CM 2027 diagnosis code · Congenital malformations and deformations of the musculoskeletal system

Non-billable header

ICD-10-CM code Q66

Code: Q66 (claims format: Q66)
Description: Congenital deformities of feet
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 17. Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA1)
Block: Q65-Q79 Congenital malformations and deformations of the musculoskeletal system

Billable codes under Q66

Q66 is a header code and cannot be used on claims. Choose the most specific code:

Q66.0 – Congenital talipes equinovarusHeader (more codes below)
Q66.1 – Congenital talipes calcaneovarusHeader (more codes below)
Q66.2 – Congenital metatarsus (primus) varusHeader (more codes below)
Q66.3 – Other congenital varus deformities of feetHeader (more codes below)
Q66.4 – Congenital talipes calcaneovalgusHeader (more codes below)
Q66.5 – Congenital pes planusHeader (more codes below)
Q66.6 – Other congenital valgus deformities of feetBillable
Q66.7 – Congenital pes cavusHeader (more codes below)
Q66.8 – Other congenital deformities of feetHeader (more codes below)
Q66.9 – Congenital deformity of feet, unspecifiedHeader (more codes below)

Notes for Q66

Excludes1 (not coded here):

reduction defects of feet (Q72.-)
valgus deformities (acquired) (M21.0-)
varus deformities (acquired) (M21.1-)

Frequently asked questions

What is ICD-10 code Q66?

Q66 is the ICD-10-CM code for congenital deformities of feet, in the block Q65-Q79 (Congenital malformations and deformations of the musculoskeletal system).

Is Q66 a billable code?

No. Q66 is a header code with more specific child codes; report one of the billable codes listed above.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.