Unequal limb length (acquired), left ulna

This code signifies an acquired disparity in the length of the left ulna, meaning the bone has become shorter or longer than its contralateral counterpart due to a condition or event occurring after birth. This can lead to functional limitations and deformities of the forearm and wrist.

Use this code when documentation clearly indicates an acquired unequal length of the left ulna, often resulting from trauma (e.g., fracture malunion), infection, or certain growth disturbances. Supporting documentation should specify the laterality (left) and the acquired nature of the length discrepancy.

• Differentiate from congenital limb length discrepancies, which are coded differently.
• Ensure the documentation specifies "acquired" and "left ulna" to support this specific code.
• Code any underlying cause of the acquired unequal length (e.g., malunion of a fracture) as a primary diagnosis if applicable.