Solitary bone cyst, left humerus

This code signifies the presence of a single, non-cancerous, fluid-filled lesion within the bone of the patient's left upper arm. These cysts are typically asymptomatic but can weaken the bone, leading to pathological fractures. It represents a benign bone tumor-like condition.

Apply this code when documentation explicitly identifies a solitary bone cyst located in the left humerus. This diagnosis is often made incidentally on imaging or following a pathological fracture. Supporting documentation includes radiology reports (X-ray, MRI) confirming a unilocular lesion consistent with a simple bone cyst, and physician notes detailing the location.

• Ensure laterality is clearly documented as "left humerus" to avoid miscoding.
• Distinguish from aneurysmal bone cysts (M85.5x) or other benign bone tumors.
• If a pathological fracture is also present, code the fracture first, followed by this code as a secondary diagnosis.