Myositis ossificans progressiva, left toe(s)

This code signifies the presence of fibrodysplasia ossificans progressiva (FOP) affecting the left toe(s). FOP is a rare genetic disorder characterized by the progressive formation of heterotopic bone in muscles, tendons, and ligaments, leading to severe functional impairment. This specific code indicates the manifestation of this condition in the left foot digits.

Use this code when documentation clearly states a diagnosis of myositis ossificans progressiva, also known as fibrodysplasia ossificans progressiva, specifically localized to the left toe(s). Supporting documentation would include genetic testing results confirming FOP, imaging studies (e.g., X-rays, CT scans) demonstrating heterotopic ossification in the left toes, and physician notes detailing the diagnosis and affected anatomical site.

• Ensure the documentation explicitly specifies "left toe(s)" to justify this laterality-specific code.
• Do not confuse this with localized myositis ossificans (e.g., M61.0- series), which is typically post-traumatic and not progressive.
• Consider sequencing this code with other codes describing associated complications or manifestations of FOP, such as restrictive lung disease or joint ankylosis, if present.