Accessory finger(s)

This code describes the congenital presence of one or more extra digits on the hand, commonly referred to as polydactyly. These accessory fingers can range from a small skin tag to a fully formed, functional digit. The condition is a birth defect involving abnormal development of the hand during gestation.

Use this code when documentation clearly indicates the presence of an extra finger(s) at birth. This applies to both rudimentary and well-developed supernumerary digits. Supporting documentation would include physician notes detailing the physical examination findings of the hand, often noting the location and characteristics of the accessory digit(s).

• Differentiate from syndactyly (fused fingers) or macrodactyly (enlarged fingers), which are coded elsewhere.
• Specify laterality (left, right, bilateral) if documented, using appropriate seventh characters.
• If the accessory digit is surgically removed, this code would still be used for the diagnosis, alongside the procedure code for excision.