Symptomatic inflammatory myopathy in diseases classified elsewhere

This code describes an inflammatory myopathy (muscle disease) that is a symptom or manifestation of another underlying systemic disease. It indicates that the muscle inflammation is not a primary condition but rather secondary to a separate, classified illness.

Use this code when documentation clearly links inflammatory myopathy as a direct consequence or symptom of another disease, such as a connective tissue disorder, autoimmune disease, or certain infections. The primary underlying disease should be coded first, followed by this code to specify the symptomatic myopathy.

• Always sequence the underlying systemic disease first, as this code is for a manifestation.
• Ensure documentation explicitly states the inflammatory myopathy is "symptomatic" or "due to" another condition.
• Do not use for primary inflammatory myopathies like polymyositis or dermatomyositis (e.g., 710.3, 710.4).