Disord of muscle in diseases classd elswhr, multiple sites

This code signifies a muscular disorder affecting multiple body sites that is secondary to another underlying disease. It indicates a systemic or widespread muscular involvement not primarily originating within the muscle itself, but rather a manifestation of another classified condition.

Apply this code when documentation clearly states a multi-site muscular disorder is a symptom or complication of another disease, such as a metabolic disorder, autoimmune condition, or infectious process. Ensure the primary underlying disease is also coded first.

• Always sequence the underlying disease first, as this code is for a manifestation of another condition.
• Avoid using this code for localized muscle disorders or primary myopathies; those have more specific codes.
• Ensure documentation specifies "multiple sites" of muscle involvement; otherwise, a more specific single-site code may be appropriate.