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Parkinson’s Disease ICD 10 Codes – Coding & Billing Solutions

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Parkinson’s Disease ICD 10 Codes – Coding & Billing Solutions

In this post we overview Parkinson’s Disease ICD 10 Codes

2024 ICD-10-CM Diagnosis Code G20

Parkinson’s disease

G20 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.

ICD-10-CM G20 is a new 2024 ICD-10-CM code that became effective on October 1, 2023.

This is the American ICD-10-CM version of G20 – other international versions of ICD-10 G20 may differ.

Applicable To:


    • Hemiparkinsonism

    • Idiopathic Parkinsonism or Parkinson’s disease

    • Paralysis agitans

    • Primary Parkinsonism or Parkinson’s disease

Use Additional

code, if applicable, to identify:


    • Dementia with anxiety (F02.84, F02.A4, F02.B4, F02.C4)

    • Dementia with behavioral disturbance (F02.81-, F02.A1-, F02.B1-, F02.C1-)

    • Dementia with mood disturbance (F02.83, F02.A3, F02.B3, F02.C3)

    • Dementia with psychotic disturbance (F02.82, F02.A2, F02.B2, F02.C2)

    • Dementia without behavioral disturbance (F02.80, F02.A0, F02.B0, F02.C0)

    • mild neurocognitive disorder due to known physiological condition (F06.7-)

The following code(s) above G20 contain annotation back-references that may be applicable to G20:

G00-G99 – Diseases of the nervous system

Approximate Synonyms


    • Dementia associated with Parkinson’s disease

    • Dementia in Parkinson’s disease

    • Parkinsonism

    • Parkinsons disease

    • Restrictive lung disease due to Parkinson’s disease

    • Restrictive lung mechanics due to Parkinson’s disease

Clinical Information


    • A disease characterized as a progressive motor disability manifested by tremors, shaking, muscular rigidity, and lack of postural reflexes.

    • A progressive degenerative disorder of the central nervous system characterized by loss of dopamine producing neurons in the substantia nigra and the presence of lewy bodies in the substantia nigra and locus coeruleus. Signs and symptoms include tremor which is most pronounced during rest, muscle rigidity, slowing of the voluntary movements, a tendency to fall back, and a mask-like facial expression.

    • A progressive disorder of the nervous system marked by muscle tremors, muscle rigidity, decreased mobility, stooped posture, slow voluntary movements, and a mask-like facial expression.

    • A progressive, degenerative neurologic disease characterized by a tremor that is maximal at rest, retropulsion (i.e. A tendency to fall backwards), rigidity, stooped posture, slowness of voluntary movements, and a masklike facial expression. Pathologic features include loss of melanin containing neurons in the substantia nigra and other pigmented nuclei of the brainstem. Lewy bodies are present in the substantia nigra and locus coeruleus but may also be found in a related condition (lewy body disease, diffuse) characterized by dementia in combination with varying degrees of parkinsonism. (Adams et al., Principles of Neurology, 6th ed, p1059, pp1067-75)

    • Parkinson’s disease is a disorder that affects nerve cells, or neurons, in a part of the brain that controls muscle movement. In Parkinson’s, neurons that make a chemical called dopamine die or do not work properly. Dopamine normally sends signals that help coordinate your movements. No one knows what damages these cells. Symptoms of Parkinson’s disease may 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. Parkinson’s usually begins around age 60, but it can start earlier. It is more common in men than in women. There is no cure for parkinson’s disease. A variety of medicines sometimes help symptoms dramatically.


    • Progressive, degenerative disorder of the nervous system characterized by tremors, rigidity, bradykinesia, postural instability, and gait abnormalities; caused by a loss of neurons and a decrease of dopamine in the basal ganglia.

Code History


    • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)

    • 2017 (effective 10/1/2016): No change

    • 2018 (effective 10/1/2017): No change

    • 2019 (effective 10/1/2018): No change

    • 2020 (effective 10/1/2019): No change

    • 2021 (effective 10/1/2020): No change

    • 2022 (effective 10/1/2021): No change

    • 2023 (effective 10/1/2022): No change

    • 2024 (effective 10/1/2023): Deleted code

    • 2024 (effective 10/1/2023): New code

Code annotations containing back-references to G20:


    • Code First: F02, R47.82, F06.7

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