Periodic paralysis

This code represents a group of rare genetic disorders characterized by episodes of muscle weakness or paralysis. These episodes are typically triggered by factors such as exercise, stress, or changes in potassium levels, and muscle strength usually returns to normal between attacks. The underlying cause involves defects in ion channels within muscle cells.

Use this code when documentation clearly indicates a diagnosis of periodic paralysis, such as hypokalemic periodic paralysis, hyperkalemic periodic paralysis, or Andersen-Tawil syndrome. Supporting documentation should describe recurrent episodes of muscle weakness or paralysis, often with identified triggers and resolution between episodes.

• Ensure the documentation specifies "periodic paralysis" and not other forms of myotonia or myopathy.
• Review the medical record for any specific type of periodic paralysis (e.g., hypokalemic, hyperkalemic) as more specific codes may be available if the type is documented.
• Remember the Excludes1 note: never code this alongside paramyotonia congenita (G71.19), as these are distinct conditions.