Longitudinal reduction defect of unspecified radius

This code describes a congenital malformation characterized by the partial or complete absence of the radius bone in the forearm, where the specific side (left or right) is not documented. This defect results in a shortened forearm and often involves associated hand and wrist anomalies, such as radial club hand.

Use this code when medical record documentation confirms a longitudinal reduction defect of the radius, but the laterality (left or right) is not specified by the provider. This diagnosis is typically made at birth or during early childhood based on physical examination and imaging studies.

• Always seek clarification from the provider if laterality is missing to assign a more specific code (Q71.41 for right, Q71.42 for left).
• Code any associated anomalies of the hand or wrist separately, such as absence of thumb (Q71.3-).
• This code is for congenital conditions; do not use for acquired radial deficiencies.