Other congenital myopathy

This code identifies a congenital muscle disorder characterized by muscle weakness and hypotonia present at birth or early infancy, not otherwise specified as a specific type of congenital myopathy. These conditions result from structural abnormalities within muscle fibers, leading to impaired muscle function.

Assign this code when documentation indicates a congenital myopathy that does not fit the criteria for a more specific type (e.g., central core disease, nemaline myopathy). Supporting documentation should include clinical findings of muscle weakness, hypotonia, and often a muscle biopsy confirming myopathic changes without a definitive specific diagnosis.

• Ensure the documentation explicitly states "congenital myopathy" and that no more specific type is identified.
• Do not use this code if the myopathy is acquired or secondary to another condition; look for codes in other categories.
• Consider sequencing this code after any codes for associated congenital anomalies or neurological manifestations.