Other calcification of muscle, unspecified upper arm

This code signifies the presence of abnormal calcium deposits within the muscle tissue of an unspecified upper arm. These calcifications are not otherwise specified as ossification or myositis ossificans, and their exact etiology is not detailed. It indicates a pathological finding rather than a normal anatomical variant.

This code is appropriate when documentation indicates calcification of a muscle in the upper arm, but the specific muscle or the precise nature of the calcification (e.g., post-traumatic, metabolic) is not further elaborated. It is used when imaging reports (X-ray, CT, MRI) or surgical findings describe muscle calcification without a more specific diagnosis.

• Ensure documentation specifies "calcification" of muscle, not just a soft tissue mass.
• Avoid using this code if a more specific diagnosis, such as myositis ossificans (M61.0-), is documented.
• Confirm the laterality is truly unspecified; if left or right upper arm is documented, a more specific code (M61.421 or M61.422) should be used.