Unequal limb length (acquired), right ulna

This code signifies an acquired disparity in the length of the right ulna, meaning the bone itself is shorter or longer than its contralateral counterpart due to a post-natal event. This condition can result in functional limitations and deformities of the forearm and hand.

Apply this code when documentation clearly indicates an acquired unequal length of the right ulna, often following trauma, infection, or surgical intervention affecting bone growth or integrity. Supporting documentation should include measurements confirming the length discrepancy and a clear etiology for its acquired nature.

• Differentiate from congenital unequal limb length, which would use a code from Q74.2.
• Ensure the documentation specifies "acquired" and clearly identifies the right ulna as the affected bone.
• Code any underlying cause or associated conditions, such as a fracture malunion, in addition to this code.