Myositis ossificans traumatica, unspecified upper arm

This code describes the formation of heterotopic bone within muscle tissue of the upper arm, specifically resulting from trauma. It represents a non-neoplastic, benign condition where bone develops in soft tissues that do not normally ossify, following an injury. The "unspecified" nature indicates the laterality (left or right) of the upper arm is not documented.

Use this code when documentation clearly states a diagnosis of myositis ossificans traumatica affecting the upper arm, and the specific side (left or right) is not specified. This typically occurs after a direct muscle injury, fracture, or repeated microtrauma. Supporting documentation should include a physician's diagnosis, imaging reports (e.g., X-ray, MRI) confirming heterotopic ossification, and a history of trauma to the area.

• Ensure the documentation explicitly links the myositis ossificans to a traumatic event; otherwise, consider M61.1- (myositis ossificans progressiva) or M61.2- (myositis ossificans associated with paralysis).
• If laterality is specified (left or right upper arm), use the more specific codes M61.021 or M61.022.
• Code any underlying or associated trauma (e.g., fracture, contusion) separately, following sequencing guidelines.