Q66.31 Other congenital varus deformities of feet, right foot

Billable ICD-10-CM code, FY2026. Exempt from present-on-admission (POA) reporting.

Applies from Q66 Congenital deformities of feet

Excludes1 (never code together)

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

Applies from Q66.3 Other congenital varus deformities of feet

Applicable to

• Hallux varus, congenital

MS-DRG index

Defines the logic of DRG(s) 564-566 in MDC 08.

Code annotations containing back-references to Q66.31

Back-references to Q66

• Type 1 Excludes: M20 Acquired deformities of fingers and toes ("congenital deformities and malformations of fingers and toes (Q66.-, Q68-Q70, Q74.-)")
• Type 1 Excludes: M21 Other acquired deformities of limbs ("congenital deformities and malformations of limbs (Q65-Q66, Q68-Q74)")
• Type 1 Excludes: M24.3 Pathological dislocation of joint, not elsewhere classified ("congenital dislocation or displacement of joint- see congenital malformations and deformations of the musculoskeletal system (Q65-Q79)")
• Type 2 Excludes: M95 Other acquired deformities of musculoskeletal system and connective tissue ("congenital malformations and deformations of the musculoskeletal system (Q65-Q79)")

Nearby codes

• Q66.221 Congenital metatarsus adductus, right foot
• Q66.222 Congenital metatarsus adductus, left foot
• Q66.229 Congenital metatarsus adductus, unspecified foot
• Q66.3 Other congenital varus deformities of feet
• Q66.30 Other congenital varus deformities of feet, unspecified foot
• Q66.31 Other congenital varus deformities of feet, right foot (this code)
• Q66.32 Other congenital varus deformities of feet, left foot
• Q66.4 Congenital talipes calcaneovalgus
• Q66.40 Congenital talipes calcaneovalgus, unspecified foot
• Q66.41 Congenital talipes calcaneovalgus, right foot
• Q66.42 Congenital talipes calcaneovalgus, left foot