ICD-10 Code G73.7 – Myopathy in diseases classified elsewhere (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G73.7 – Myopathy in diseases classified elsewhere
What it is
This code identifies a muscle disorder caused by another underlying disease. Use it when the myopathy is documented as secondary to a separate condition, not as a primary muscle disease.
Clinical signs
Clinical features vary; refer to documentation. Commonly, you may see muscle weakness, reduced endurance, or abnormal muscle findings linked to the underlying disorder.
When to use this code
Use G73.7 when the record states myopathy due to another classified disease and the cause is documented. It fits cases where the muscle disorder is secondary and the underlying condition is being managed separately. Check documentation if the provider does not clearly link the myopathy to another disease.
Do not use for
Do not use this code for primary myopathies, unspecified muscle weakness, or muscle symptoms without a documented causal disease. If the record says only “myalgia” or “weakness,” check documentation.
Coding tip
Always code the underlying disease first when documented, and confirm the provider’s causal statement before assigning G73.7.