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 ataxia (in):
 * hypothyroidism (E03.-)
 * myxedematous congenital iodine deficiency (E00.1)

G14 Postpolio syndrome

 * Postpolio myelitic syndrome
 * Excludes1: sequelae of poliomyelitis (B91)

=Extrapyramidal and movement disorders (G20-G26) =

G20 Parkinson's disease

 * Includes hemiparkinsonism
 * idiopathic Parkinsonism or Parkinson's disease
 * paralysis agitans
 * Parkinsonism or Parkinson's disease NOS
 * primary Parkinsonism or Parkinson's disease
 * Excludes1: dementia with Parkinsonism (G31.83)

G21 Secondary parkinsonism

 * Excludes1: dementia with Parkinsonism (G31.83)
 * Huntington's disease (G10)
 * Shy-Drager syndrome (G90.3)
 * syphilitic Parkinsonism (A52.19)
 * G21.0 Malignant neuroleptic syndrome
 * Code first (T43.3-T43.5) to identify drug
 * Excludes1: neuroleptic induced parkinsonism (G21.11)
 * G21.1 Other drug-induced secondary parkinsonism
 * G21.11 Neuroleptic induced parkinsonism
 * Code first (T43.3-T43.5) to identify drug
 * Excludes1: malignant neuroleptic syndrome (G21.0)
 * G21.19 Other drug induced secondary parkinsonism
 * Code first (T36-T50) to identify drug
 * G21.2 Secondary parkinsonism due to other external agents
 * Code first (T51-T65) to identify external agent
 * G21.3 Postencephalitic parkinsonism
 * G21.4 Vascular parkinsonism
 * G21.8 Other secondary parkinsonism
 * G21.9 Secondary parkinsonism, unspecified

G23 Other degenerative diseases of basal ganglia

 * Excludes2: multi-system degeneration of the autonomic nervous system (G90.3)
 * G23.0 Hallervorden-Spatz disease
 * Pigmentary pallidal degeneration
 * G23.1 Progressive supranuclear ophthalmoplegia [Steele-Richardson-Olszewski]
 * G23.2 Striatonigral degeneration
 * G23.