ICD-10 Code G71 – Primary disorders of muscles (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G71 – Primary disorders of muscles
What it is
G71 identifies primary disorders of muscle, meaning the muscle tissue itself is the main problem rather than a nerve, joint, or bone issue. Use it when documentation describes a myopathy or similar muscle disease.
Clinical signs
Typical findings include muscle weakness, reduced endurance, and difficulty with movement. Clinical features vary; refer to documentation for the specific muscle disorder being evaluated.
When to use this code
Use G71 when the provider documents a primary muscle disorder without naming a more specific ICD-10-CM code. It may apply to generalized myopathic conditions, inherited muscle disease, or other primary muscle pathology. If the record gives a precise diagnosis, code that condition instead.
Do not use for
Do not use G71 for weakness caused by nerve disease, trauma, arthritis, or systemic illness. Check documentation if the condition is secondary, unspecified, or better coded elsewhere.
Coding tip
Query for the exact myopathy type and laterality or inheritance details when the note is vague.