ICD-11 classes
08 Diseases of the nervous system
Movement disorders
8A00 — Parkinsonism

ICD-11 8A00 — Parkinsonism

Parkinsonism is a clinical syndrome characterised by four cardinal features: rest tremor, muscular rigidity, akinesia or bradykinesia, and postural disturbances which include shuffling gait and flexed posture and loss of postural reflexes. Bradykinesia and one other clinical feature is required to make a diagnosis of Parkinsonism. Parkinsonism may result from a variety of conditions including progressive neurodegenerative disorders such as Parkinson Disease or Atypical Parkinsonism where the progressive degeneration of nigral and other neurons leads to dopamine deficiency. Parkinsonism may also be a result of structural lesions such as strokes or tumours or blockage of dopamine receptors in the striatum by drugs such as neuroleptics.

The diagnosis includes nothing.

Diagnosis with code 8A00 contains 6 clarifying diagnoses:

1. 8A00.0 — Parkinson disease
   It contains 4 clarifying diagnoses.
2. 8A00.1 — Atypical parkinsonism
   It contains 5 clarifying diagnoses.
3. 8A00.2 — Secondary parkinsonism
   It contains 9 clarifying diagnoses.
4. 8A00.3 — Functional parkinsonism
5. 8A00.Y — Other specified parkinsonism
6. 8A00.Z — Parkinsonism, unspecified