Q66.80 Congenital vertical talus deformity, unspecified 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-)

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 754.61 Congenital pes planus (approximate)

Code annotations containing back-references to Q66.80

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)")

Diagnosis Index entries for Q66.80

• Deformity › vertical talus (congenital)
• Vertical talus (congenital)

Nearby codes

• Q66.7 Congenital pes cavus
• Q66.70 Congenital pes cavus, unspecified foot
• Q66.71 Congenital pes cavus, right foot
• Q66.72 Congenital pes cavus, left foot
• Q66.8 Other congenital deformities of feet
• Q66.80 Congenital vertical talus deformity, unspecified foot (this code)
• Q66.81 Congenital vertical talus deformity, right foot
• Q66.82 Congenital vertical talus deformity, left foot
• Q66.89 Other specified congenital deformities of feet
• Q66.9 Congenital deformity of feet, unspecified
• Q66.90 Congenital deformity of feet, unspecified, unspecified foot