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  3. Q00-Q99
  4. Q65-Q79
  5. Congenital deformities of feet (Q66)

Congenital deformities of feet (Q66)

ICD-10 codes Q66 and its subcategories are specifically used for identifying and classifying congenital deformities of the feet. These codes cover a broad range of foot abnormalities present at birth, such as talipes equinovarus (clubfoot), talipes calcaneovarus, metatarsus varus, pes planus (flatfoot), pes cavus (high arch), and other varus or valgus deformities affecting the feet.

This code set helps medical coders distinguish between different conditions by specifying the location (right foot, left foot, unspecified) and type of deformity. For example, Q66.0 series captures various forms of congenital talipes equinovarus, often known as clubfoot or by synonyms like talipes equinus and cavovarus deformities. Similarly, Q66.2 and Q66.22 detail metatarsus primus varus and metatarsus adductus, terms linked to the inward turning of the front foot. Coders encountering terms like “hallux valgus due to metatarsus primus varus” can find precise matching codes here. Other codes such as Q66.5 refer to congenital pes planus, while Q66.7 indicate pes cavus. The comprehensive subdivision facilitates accurate documentation and billing for various complex congenital foot conditions, including rarer deformities listed under Q66.8 and Q66.9. Using the correct ICD-10 code for congenital foot deformities ensures clarity in diagnosis and treatment planning.

  • Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)

    • Congenital malformations and deformations of the musculoskeletal system (Q65-Q79)

        • Congenital deformities of feet (Q66)

        • Q66 Congenital deformities of feet
        • Q66.0 Congenital talipes equinovarus
        • Q66.00 Congenital talipes equinovarus, unspecified foot
        • Q66.01 Congenital talipes equinovarus, right foot
        • Q66.02 Congenital talipes equinovarus, left foot
        • Q66.1 Congenital talipes calcaneovarus
        • Q66.10 Congenital talipes calcaneovarus, unspecified foot
        • Q66.11 Congenital talipes calcaneovarus, right foot
        • Q66.12 Congenital talipes calcaneovarus, left foot
        • Q66.2 Congenital metatarsus (primus) varus
        • Q66.21 Congenital metatarsus primus varus
        • Q66.211 Congenital metatarsus primus varus, right foot
        • Q66.212 Congenital metatarsus primus varus, left foot
        • Q66.219 Congenital metatarsus primus varus, unspecified foot
        • Q66.22 Congenital metatarsus adductus
        • 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
        • 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
        • Q66.5 Congenital pes planus
        • Q66.50 Congenital pes planus, unspecified foot
        • Q66.51 Congenital pes planus, right foot
        • Q66.52 Congenital pes planus, left foot
        • Q66.6 Other congenital valgus deformities of feet
        • 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
        • 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
        • Q66.91 Congenital deformity of feet, unspecified, right foot
        • Q66.92 Congenital deformity of feet, unspecified, left foot

Instructional Notations

Type 1 Excludes

A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.

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

Clinical Terms

The following clinical terms provide additional context, helping users better understand the clinical background and common associations for each diagnosis listed in this section. Including related terms alongside ICD-10-CM codes supports coders, billers, and healthcare professionals in improving accuracy, enhancing documentation, and facilitating research or patient education.

Clubfoot

A deformed foot in which the foot is plantarflexed, inverted, and adducted.

Equinus Deformity

Plantar declination of the foot.

Flatfoot

Anomaly in which one or more of the arches of the feet are flat.

Hypertelorism

Abnormal increase in the interorbital distance due to overdevelopment of the lesser wings of the sphenoid.

Talipes

Deformity in which the foot is misaligned with respect to the TALUS in the ANKLE JOINT. While mostly congenital, as in CLUBFOOT, acquired deformities are included. Acquired talipedes are often associated with other foot deformities such as SYNDACTYLY and POLYDACTYLY.

Talipes Cavus

A foot deformity in which the arch of the foot is high and often the heel adducted.