Other inherited spinal muscular atrophy

This code represents a group of genetic disorders characterized by progressive degeneration of motor neurons in the spinal cord and brainstem, leading to muscle weakness and atrophy. These conditions are inherited, distinct from the more common Type I, II, and III spinal muscular atrophies.

Assign this code for inherited forms of spinal muscular atrophy that do not fit the criteria for specific types like Werdnig-Hoffmann disease or Kugelberg-Welander disease. Documentation should clearly state "other inherited spinal muscular atrophy" or specify a rare, inherited type not otherwise classified.

• Ensure documentation explicitly states "inherited" and specifies a type of SMA not covered by more specific codes (e.g., G12.0).
• Do not use this code for acquired forms of muscular atrophy or for SMA types I, II, or III.
• Review genetic testing results or neurologist's notes for precise diagnostic information to differentiate from other neuromuscular disorders.