Disorders of muscle in diseases classd elswhr, unsp site

This diagnosis code signifies a muscular disorder that is secondary to another underlying disease process, where the specific anatomical location of the affected muscle is not documented. It indicates a myopathy or other muscle pathology that is a manifestation of an elsewhere-classified condition.

This code is appropriate when the medical record clearly links a muscle disorder to another primary disease (e.g., endocrine, metabolic, or infectious disease), but the physician has not specified which muscle group is affected. Documentation should explicitly state the muscle involvement is secondary to another condition.

• Always attempt to find a more specific code if the muscle group is identified in the documentation.
• This code requires a secondary diagnosis to identify the underlying disease causing the muscle disorder.
• Avoid using this code if the muscle disorder is primary or if the underlying disease is not clearly documented as the cause.