Disorders of muscle in diseases classd elswhr, unsp thigh

This code signifies a muscular disorder in the thigh that is secondary to another underlying disease process, but the specific type of muscle involvement is not documented. It indicates a manifestation of a systemic condition affecting the thigh muscles, where the primary disease is classified elsewhere in the ICD-10-CM system.

Apply this code when documentation clearly links a thigh muscle disorder to an underlying systemic disease (e.g., autoimmune disease, metabolic disorder, infectious disease), but the exact nature of the muscle pathology (e.g., myositis, atrophy, hypertrophy) is not specified. The primary disease code must always be sequenced first.

• Always sequence the underlying disease code first, as this code is a manifestation code.
• Avoid using this code if a more specific muscle disorder of the thigh (e.g., M60.xx for myositis) can be identified and linked to the underlying disease.
• Ensure documentation explicitly states the thigh as the affected anatomical site and that the muscle disorder is secondary to another classified disease.