Acute nonparalytic poliomyelitis

This code signifies an acute viral infection of the central nervous system caused by poliovirus, presenting without muscle weakness or paralysis. It represents the abortive or non-paralytic form of poliomyelitis, characterized by symptoms such as fever, headache, vomiting, and stiff neck, but crucially, no motor deficits.

Apply this code when documentation confirms a diagnosis of poliomyelitis where the patient exhibits typical acute symptoms but no evidence of paralysis or muscle weakness. This diagnosis is often supported by positive viral cultures or serological tests for poliovirus, alongside the absence of neurological deficits on examination.

• Differentiate carefully from paralytic forms of poliomyelitis (A80.0-A80.3, A80.8, A80.9) which involve muscle weakness or paralysis.
• Ensure documentation explicitly states "nonparalytic" or describes symptoms consistent with the abortive form without motor involvement.
• Consider sequencing this code as the primary diagnosis when it is the reason for the encounter.