Q66Header code — not billable
Congenital deformities of feet
- Chapter
- 17. Congenital malformations, deformations and chromosomal abnormalities
- Category
- Q66
- Effective date
- October 1, 2026
Related codes in category Q66
Q66.0Congenital talipes equinovarusQ66.00Congenital talipes equinovarus, unspecified footYesQ66.01Congenital talipes equinovarus, right footYesQ66.02Congenital talipes equinovarus, left footYesQ66.1Congenital talipes calcaneovarusQ66.10Congenital talipes calcaneovarus, unspecified footYesQ66.11Congenital talipes calcaneovarus, right footYesQ66.12Congenital talipes calcaneovarus, left footYesQ66.2Congenital metatarsus (primus) varusQ66.21Congenital metatarsus primus varusQ66.211Congenital metatarsus primus varus, right footYesQ66.212Congenital metatarsus primus varus, left footYes
Frequently asked questions
What is ICD-10 code Q66?
Q66 is an ICD-10-CM diagnosis code for Congenital deformities of feet.
Is Q66 a billable code?
No. Q66 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is Q66 in?
Q66 falls under Chapter 17: Congenital malformations, deformations and chromosomal abnormalities.
When did Q66 become effective?
Q66 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to Q66?
Q66 belongs to category Q66, which includes 12 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.