ICD-10 Code G73 – Disorders of myoneural junction and muscle in diseases classified elsewhere (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G73 – Disorders of myoneural junction and muscle in diseases classified elsewhere
What it is
Code G73 identifies neuromuscular junction or muscle disorders that occur as a manifestation of another disease. Use it when the muscle problem is not the primary condition and the underlying cause is documented elsewhere.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include muscle weakness, fatigability, or other signs of impaired neuromuscular function linked to the underlying disease.
When to use this code
Use G73 when the provider states the myoneural junction or muscle disorder is due to another classified condition, such as a systemic or neurologic disease. You should code the underlying disease first when instructed by the record and coding guidelines. Confirm the causal relationship is clearly documented.
Do not use for
Do not use G73 for primary muscle diseases or isolated neuromuscular disorders without an underlying cause. If the chart does not link the disorder to another disease, check documentation.
Coding tip
Always capture the underlying condition and any specified manifestation code together when the record supports a causal relationship.