Longitudinal reduction defect of left ulna

This code signifies a congenital malformation characterized by the partial or complete absence of the ulna bone in the left forearm, occurring along its longitudinal axis. This defect can range from hypoplasia (underdevelopment) to complete aplasia (absence) of the ulna, often accompanied by other limb anomalies.

Apply this code when documentation clearly indicates a congenital longitudinal reduction defect affecting the left ulna. This diagnosis is typically made at birth or early childhood based on physical examination and imaging studies such as X-rays. Supporting documentation should specify the laterality (left) and the nature of the ulnar deficiency.

• Ensure documentation specifies "left" ulna; do not use for bilateral or right-sided defects.
• Consider additional codes for associated anomalies, such as radial head dislocation or hand deformities, if present.
• This code is for a congenital condition; do not use for acquired ulnar injuries or defects.