Idiopathic parkinsonism or Lewy body PD  read Mycoplasma 

Secondary (symptomatic) parkinsonism

Drug-induced (dopamine receptor blockers, presynaptic dopamine-depleting agents)
Toxin-induced (MPTP, manganese, carbon monoxide, hypoxia)This is the condition reported in M.J. Fox the sudden onset to this toxin which selectively affects the same neurones as idopathic Parkinson disease.

Metabolic disorders (eg, Wilson's disease)

The brown ring is prominent for Wilsons

  The brown ring around Iris is the copper in Wilson's. In Wilson disease a brown ring around eyes is visible its very prominent and may be present without any clinical symptoms. In late stages liver is affected and dystonic movements are present.

Vascular parkinsonism
Postencephalitic

Posttraumatic

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Neurodegenerative diseases

Progressive supranuclear palsy

Multiple system atrophy

Cortical-basal ganglionic degeneration

Diffuse Lewy body disease

Amyotrophic lateral sclerosis/parkinsonism-dementia complex of Guam

Alzheimer's disease with extrapyramidal signs
Rigid variant of Huntington's disease
Hallervorden-Spatz disease
Other disorders with parkinsonian features
Normal pressure hydrocephalus
Psychogenic parkinsonism