Solitary bone cyst, unspecified shoulder

This code signifies the presence of a solitary bone cyst, also known as a unicameral bone cyst, located in an unspecified shoulder. These are benign, fluid-filled lesions typically found in the metaphysis of long bones, often discovered incidentally or after a pathological fracture.

Use this code when documentation confirms a diagnosis of a solitary bone cyst affecting the shoulder, but the specific laterality (left or right) is not documented. This is appropriate for initial diagnosis, follow-up, or when the cyst is the primary reason for the encounter.

• Avoid using this code if laterality (left or right shoulder) is specified; instead, select the more specific M85.411 or M85.412.
• Ensure the documentation clearly states "solitary bone cyst" or "unicameral bone cyst" to support this diagnosis.
• If a pathological fracture due to the cyst is present, sequence the fracture code first, followed by this code as an underlying condition.