Congenital vertical talus deformity, unspecified foot

This code describes a congenital foot deformity where the talus bone is abnormally positioned in a vertical orientation, leading to a rigid flatfoot appearance. The condition is present at birth and results in a characteristic "rocker-bottom" foot due to the fixed dorsiflexion of the forefoot and plantarflexion of the hindfoot.

Use this code when documentation specifies a congenital vertical talus deformity without laterality specified. This diagnosis is typically made clinically at birth or shortly thereafter, often confirmed with imaging studies like X-rays. The medical record should clearly state the presence of this specific congenital foot anomaly.

• Ensure documentation specifies "congenital vertical talus" to differentiate from other types of flatfoot or talipes.
• Avoid using this code if the laterality (left or right foot) is documented; instead, use the more specific codes Q66.81 or Q66.82.
• Do not confuse with acquired flatfoot (M21.4-) or other congenital foot deformities like clubfoot (Q66.0-Q66.1).