"Parkinson's disease" means a chronic and progressive neurologic disorder resulting from deficiency of the neurotransmitter dopamine as the consequence of specific degenerative changes in the area of the brain called the basal ganglia. It is characterized by tremor at rest, slow movements, muscle rigidity, stooped posture, and unsteady or shuffling gait.
"Parkinsonisms" means related conditions that cause a combination of the movement abnormalities seen in Parkinson's disease, such as tremor at rest, slow movement, muscle rigidity, impaired speech or muscle stiffness, which often overlap with and can evolve from what appears to be Parkinson's disease. These include: Multiple System Atrophy (MSA), Dementia with Lewy Bodies (DLB), Corticobasal Degeneration (CBD), and Progressive Supranuclear Palsy (PSP).
W. Va. Code § 16-5DD-1