Aneurysmal bone cyst, left hand

This code identifies a benign, expansile, and lytic bone lesion characterized by blood-filled spaces separated by fibrous septa, specifically located in the left hand. It represents a non-neoplastic bone cyst that can cause pain, swelling, and pathological fractures.

Apply this code when documentation clearly indicates a diagnosis of an aneurysmal bone cyst affecting the left hand. Supporting documentation should include imaging reports (e.g., X-ray, MRI) confirming the lesion's presence and location, and potentially a pathology report if a biopsy was performed.

• Ensure the laterality (left hand) is explicitly documented to support this specific code.
• Differentiate from other benign bone tumors or cysts, such as unicameral bone cysts, which have different ICD-10-CM codes.
• If a pathological fracture is also present due to the cyst, code the fracture first, followed by this code as an underlying condition.