Unequal limb length (acquired), left humerus

This code signifies an acquired disparity in the length of the left humerus, meaning the bone in the upper arm is shorter or longer than its contralateral counterpart due to a condition developed after birth. This can result from trauma, infection, tumor, or surgical intervention affecting growth plates or bone remodeling.

Apply this code when documentation clearly indicates an acquired unequal length of the left humerus, often noted during physical examination, imaging studies (e.g., X-ray, CT scan), or as a sequela of a previous injury or disease. This code is appropriate for conditions like post-traumatic growth arrest or bone loss following osteomyelitis.

• Ensure documentation specifies "acquired" and laterality (left humerus) to differentiate from congenital limb length discrepancies.
• Always code the underlying cause of the acquired unequal length if known and documented (e.g., fracture malunion, osteomyelitis).
• Do not confuse with codes for congenital limb length differences or general limb shortening without specified laterality or bone.