Secondary parkinsonism, unspecified
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In short
Parkinson's disease is a movement disorder that happens when nerve cells in the brain do not produce enough dopamine. Symptoms begin gradually, often on one side of the body, and include trembling, stiffness, slowness of movement, and poor balance and coordination. As symptoms get worse, people with the disease may have trouble walking, talking, sleeping, chewing, swallowing, or speaking, and may also have depression. Diagnosis is based on a medical history and a neurological examination, and while there is no cure, medicines, surgery, and deep brain stimulation can help symptoms.
Source: MedlinePlus, National Library of Medicine.
AI-generated summary of the sources cited on this page, checked automatically against them. Not reviewed by a clinician; not medical advice.
Codes
Description
Parkinson's disease (PD) is a type of movement disorder. It happens when nerve cells in the brain don't produce enough of a brain chemical called dopamine. Sometimes it is genetic, but most cases do not seem to run in families. Exposure to chemicals in the environment might play a role.
Symptoms begin gradually, often on one side of the body. Later they affect both sides. They include:
- Trembling of hands, arms, legs, jaw and face
- Stiffness of the arms, legs and trunk
- Slowness of movement
- Poor balance and coordination
As symptoms get worse, people with the disease may have trouble walking, talking, or doing simple tasks. They may also have problems such as depression, sleep problems, or trouble chewing, swallowing, or speaking.
There is no specific test for PD, so it can be difficult to diagnose. Doctors use a medical history and a neurological examination to diagnose it.
PD usually begins around age 60, but it can start earlier. It is more common in men than in women. There is no cure for PD. A variety of medicines sometimes help symptoms dramatically. Surgery and deep brain stimulation (DBS) can help severe cases. With DBS, electrodes are surgically implanted in the brain. They send electrical pulses to stimulate the parts of the brain that control movement.
NIH: National Institute of Neurological Disorders and Stroke
Next to it in ICD-10
- G12Spinal muscular atrophy
- G14Post-polio syndrome
- G20Parkinson disease, unspecified
- G24Dystonia
- G30Alzheimer disease
- G35Multiple Sclerosis
Neighbouring codes in the classification, not a medical link.
External resources
Questions
What is the ICD-10 code for Secondary parkinsonism, unspecified?
G21 (WHO, International Classification of Diseases, 10th Revision).
What is the ICD-11 code for Secondary parkinsonism, unspecified?
8A00.2Z: Secondary parkinsonism, unspecified (WHO, ICD-11 for Mortality and Morbidity Statistics).
Sources and attribution
- ICD-11 for Mortality and Morbidity Statistics, © World Health Organization, licensed under CC BY-ND 3.0 IGO.
- Names other than the official source titles: Anpheros translations and plain-language names, made with AI assistance and checked automatically; the source names are in English.
- Source: MedlinePlus, National Library of Medicine.
- ICD-10 codes and titles © World Health Organization. Source: WHO, International Classification of Diseases, 10th Revision (2019).
Anpheros Search catalog 2026.10.5, published 17 October 2026. About the data →
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