X-linked myotubular myopathy

This code identifies X-linked myotubular myopathy, a severe, congenital neuromuscular disorder primarily affecting males. It is characterized by profound muscle weakness, hypotonia, and respiratory insufficiency, often presenting at birth or in early infancy. The condition results from mutations in the MTM1 gene, leading to abnormal muscle fiber development with centrally located nuclei.

Assign this code for patients diagnosed with X-linked myotubular myopathy, typically confirmed by genetic testing or muscle biopsy findings consistent with myotubular pathology. Documentation should specify the X-linked form of the disease, distinguishing it from other congenital myopathies. This code is appropriate for initial diagnosis and ongoing management of affected individuals.

• Ensure documentation explicitly states "X-linked" to differentiate from other forms of myotubular myopathy.
• Consider additional codes for associated conditions such as respiratory failure (e.g., J96.0x) or feeding difficulties (e.g., R63.3).
• Do not confuse with other congenital myopathies (e.g., G71.21, G71.29) unless the specific X-linked myotubular form is confirmed.