Acute infective polyneuritis

This code represents an acute inflammatory disorder affecting the peripheral nervous system, characterized by rapid onset of muscle weakness and sometimes paralysis. It is an autoimmune condition where the body's immune system attacks its own nerves, often triggered by an infection. The most common form is Guillain-Barré Syndrome (GBS).

Apply this code when documentation clearly indicates a diagnosis of acute polyneuropathy with an infectious etiology or post-infectious trigger, such as Guillain-Barré Syndrome. Supporting documentation should detail the acute onset of motor weakness, sensory disturbances, and findings consistent with demyelination or axonal damage on nerve conduction studies.

• Differentiate from chronic or hereditary polyneuropathies, which have distinct ICD-9-CM codes.
• Ensure the "infective" aspect is documented, even if the specific pathogen is not identified.
• Consider sequencing this code as a primary diagnosis when it is the reason for the encounter.