2022 ICD-10-CM Diagnosis Code G20: Parkinson's Disease

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ICD-10-CM Codes
G00-G99
G20-G26
G20-
2026 ICD-10-CM Diagnosis Code G20

2026 ICD-10-CM Diagnosis Code G20

Parkinson's disease

2016

2017

2018

2019

2020

2021

2022

2023

2024 - Converted to Parent Code

2025

2026

Non-Billable/Non-Specific Code

G20 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
The 2026 edition of ICD-10-CM G20 became effective on October 1, 2025.
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 AdditionalUse Additional HelpCertain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation. In most cases the manifestation codes will have in the code title, "in diseases classified elsewhere." Codes with this title are a component of the etiology/manifestation convention. The code title indicates that it is a manifestation code. "In diseases classified elsewhere" codes are never permitted to be used as first listed or principle diagnosis codes. They must be used in conjunction with an underlying condition code and they must be listed following the underlying condition.

code, if applicable, to identify:
dementia with anxiety (ICD-10-CM Diagnosis Code F02.84
Dementia in other diseases classified elsewhere, unspecified severity, with anxiety
Applicable To
- Major neurocognitive disorder in other diseases classified elsewhere unspecified severity, with anxiety
F02.84, ICD-10-CM Diagnosis Code F02.A4
Dementia in other diseases classified elsewhere, mild, with anxiety
Applicable To
- Major neurocognitive disorder in other diseases classified elsewhere, mild, with anxiety
F02.A4, ICD-10-CM Diagnosis Code F02.B4
Dementia in other diseases classified elsewhere, moderate, with anxiety
Applicable To
- Major neurocognitive disorder in other diseases classified elsewhere, moderate, with anxiety
F02.B4, ICD-10-CM Diagnosis Code F02.C4
Dementia in other diseases classified elsewhere, severe, with anxiety
Applicable To
- Major neurocognitive disorder in other diseases classified elsewhere, severe, with anxiety
F02.C4)
dementia with behavioral disturbance (ICD-10-CM Diagnosis Code F02.81
Dementia in other diseases classified elsewhere, unspecified severity, with behavioral disturbance
F02.81-, ICD-10-CM Diagnosis Code F02.A1
Dementia in other diseases classified elsewhere, mild, with behavioral disturbance
F02.A1-, ICD-10-CM Diagnosis Code F02.B1
Dementia in other diseases classified elsewhere, moderate, with behavioral disturbance
F02.B1-, ICD-10-CM Diagnosis Code F02.C1
Dementia in other diseases classified elsewhere, severe, with behavioral disturbance
F02.C1-)
dementia with mood disturbance (ICD-10-CM Diagnosis Code F02.83
Dementia in other diseases classified elsewhere, unspecified severity, with mood disturbance
Applicable To
- Dementia in other diseases classified elsewhere, unspecified severity, with mood disturbance such as depression, apathy, or anhedonia
- Major neurocognitive disorder in other diseases classified elsewhere unspecified severity, with mood disturbance such as with depression, apathy, or anhedonia
F02.83, ICD-10-CM Diagnosis Code F02.A3
Dementia in other diseases classified elsewhere, mild, with mood disturbance
Applicable To
- Dementia in other diseases classified elsewhere, mild, with mood disturbance such as depression, apathy, or anhedonia
- Major neurocognitive disorder in other diseases classified elsewhere, mild, with mood disturbance such as depression, apathy, or anhedonia
F02.A3, ICD-10-CM Diagnosis Code F02.B3
Dementia in other diseases classified elsewhere, moderate, with mood disturbance
Applicable To
- Dementia in other diseases classified elsewhere, moderate, with mood disturbance such as depression, apathy, or anhedonia
- Major neurocognitive disorder in other diseases classified elsewhere, moderate, with mood disturbance such as depression, apathy, or anhedonia
F02.B3, ICD-10-CM Diagnosis Code F02.C3
Dementia in other diseases classified elsewhere, severe, with mood disturbance
Applicable To
- Dementia in other diseases classified elsewhere, severe, with mood disturbance such as depression, apathy, or anhedonia
- Major neurocognitive disorder in other diseases classified elsewhere, severe, with mood disturbance such as depression, apathy, or anhedonia
F02.C3)
dementia with psychotic disturbance (ICD-10-CM Diagnosis Code F02.82
Dementia in other diseases classified elsewhere, unspecified severity, with psychotic disturbance
Applicable To
- Dementia in other diseases classified elsewhere, unspecified severity, with psychotic disturbance such as hallucinations, paranoia, suspiciousness, or delusional state
- Major neurocognitive disorder in other diseases classified elsewhere, unspecified, with psychotic disturbance such as hallucinations, paranoia, suspiciousness, or delusional state
F02.82, ICD-10-CM Diagnosis Code F02.A2
Dementia in other diseases classified elsewhere, mild, with psychotic disturbance
Applicable To
- Dementia in other diseases classified elsewhere, mild, with psychotic disturbance such as hallucinations, paranoia, suspiciousness, or delusional state
- Major neurocognitive disorder in other diseases classified elsewhere, mild, with psychotic disturbance such as hallucinations, paranoia, suspiciousness, or delusional state
F02.A2, ICD-10-CM Diagnosis Code F02.B2
Dementia in other diseases classified elsewhere, moderate, with psychotic disturbance
Applicable To
- Dementia in other diseases classified elsewhere, moderate, with psychotic disturbance such as hallucinations, paranoia, suspiciousness, or delusional state
- Major neurocognitive disorder in other diseases classified elsewhere, moderate, with psychotic disturbance such as hallucinations, paranoia, suspiciousness, or delusional state
F02.B2, ICD-10-CM Diagnosis Code F02.C2
Dementia in other diseases classified elsewhere, severe, with psychotic disturbance
Applicable To
- Dementia in other diseases classified elsewhere, severe, with psychotic disturbance such as hallucinations, paranoia, suspiciousness, or delusional state
- Major neurocognitive disorder in other diseases classified elsewhere, severe, with psychotic disturbance such as hallucinations, paranoia, suspiciousness, or delusional state
F02.C2)
dementia without behavioral disturbance (ICD-10-CM Diagnosis Code F02.80
Dementia in other diseases classified elsewhere, unspecified severity, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety
Applicable To
- Dementia in other diseases classified elsewhere NOS
- Major neurocognitive disorder in other diseases classified elsewhere NOS
F02.80, ICD-10-CM Diagnosis Code F02.A0
Dementia in other diseases classified elsewhere, mild, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety
Applicable To
- Dementia in other diseases classified elsewhere, mild, NOS
- Major neurocognitive disorder in other diseases classified elsewhere, mild, NOS
F02.A0, ICD-10-CM Diagnosis Code F02.B0
Dementia in other diseases classified elsewhere, moderate, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety
Applicable To
- Dementia in other diseases classified elsewhere, moderate, NOS
- Major neurocognitive disorder in other diseases classified elsewhere, moderate, NOS
F02.B0, ICD-10-CM Diagnosis Code F02.C0
Dementia in other diseases classified elsewhere, severe, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety
Applicable To
- Dementia in other diseases classified elsewhere, severe, NOS
- Major neurocognitive disorder in other diseases classified elsewhere, severe, NOS
F02.C0)
mild neurocognitive disorder due to known physiological condition (ICD-10-CM Diagnosis Code F06.7
Mild neurocognitive disorder due to known physiological condition
Applicable To
- Mild neurocognitive impairment due to a known physiological condition
Code First
- the underlying physiological condition, such as:
- Alzheimer's disease (G30.-)
- human immunodeficiency virus [HIV] disease (B20)
- Huntington's disease (G10)
- Neurocognitive disorder with Lewy bodies (G31.83)
- other frontotemporal neurocognitive disorder (G31.09)
- Parkinson's disease (G20.-)
- systemic lupus erythematosus (M32.-)
- traumatic brain injury (S06.-)
- vitamin B deficiency (E53.-)
Type 1 Excludes
- age related cognitive decline (R41.81)
- altered mental status (R41.82)
- cerebral degeneration (G31.9)
- change in mental status (R41.82)
- cognitive deficits following (sequelae of) cerebral hemorrhage or infarction (I69.01-I69.11-, I69.21-I69.31-, I69.81- I69.91-)
- dementia (F01.-, F02.-, F03.-)
- mild cognitive impairment due to unknown or unspecified etiology (G31.84)
- neurologic neglect syndrome (R41.4)
- personality change, nonpsychotic (F68.8)
F06.7-)

The following code(s) above G20 contain annotation back-referencesAnnotation Back-ReferencesIn this context, annotation back-references refer to codes that contain:

Applicable To annotations, or
Code Also annotations, or
Code First annotations, or
Excludes1 annotations, or
Excludes2 annotations, or
Includes annotations, or
Note annotations, or
Use Additional annotations

that may be applicable to G20:

G00-G99 2026 ICD-10-CM Range G00-G99
Diseases of the nervous systemType 2 Excludes
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Diseases of the nervous system

Approximate Synonyms

Dementia associated with parkinson's disease
Dementia in parkinsons disease
Parkinsonism
Parkinsons disease
Restrictive lung disease due to parkinsons disease
Restrictive lung mechanics due to parkinsons 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
2025 (effective 10/1/2024): No change
2026 (effective 10/1/2025): No change

Code annotations containing back-references to G20:

Code First: F02, F06.7, R47.82 ICD-10-CM Diagnosis Code F02
Dementia in other diseases classified elsewhere
Code First
- the underlying physiological condition, such as:
- Alzheimer's (G30.-)
- cerebral lipidosis (E75.4)
- Creutzfeldt-Jakob disease (A81.0-)
- epilepsy and recurrent seizures (G40.-)
- frontotemporal dementia (G31.09)
- hepatolenticular degeneration (E83.01)
- human immunodeficiency virus [HIV] disease (B20)
- Huntington's disease (G10)
- hypercalcemia (E83.52)
- hypothyroidism, acquired (E00-E03.-)
- intoxications (T36-T65)
- Jakob-Creutzfeldt disease (A81.0-)
- multiple sclerosis (G35-)
- neurocognitive disorder with Lewy bodies (G31.83)
- neurosyphilis (A52.17)
- niacin deficiency [pellagra] (E52)
- other frontotemporal neurocognitive disorder (G31.90)
- Parkinson's disease (G20.-)
- Pick's disease (G31.01)
- polyarteritis nodosa (M30.0)
- prion disease (A81.9)
- systemic lupus erythematosus (M32.-)
- traumatic brain injury (S06.-)
- trypanosomiasis (B56.-, B57.-)
- vitamin B deficiency (E53.8)
Includes
- Major neurocognitive disorder in other diseases classified elsewhere
Type 1 Excludes
- mild neurocognitive disorder due to known physiological condition with or without behavioral disturbance (F06.7-)
Type 2 Excludes
- dementia in alcohol and psychoactive substance disorders (F10-F19, with .17, .27, .97)
- vascular dementia (F01.5-, F01.A-, F01.B-, F01.C-)
ICD-10-CM Diagnosis Code F06.7
Mild neurocognitive disorder due to known physiological condition
Applicable To
- Mild neurocognitive impairment due to a known physiological condition
Code First
- the underlying physiological condition, such as:
- Alzheimer's disease (G30.-)
- human immunodeficiency virus [HIV] disease (B20)
- Huntington's disease (G10)
- Neurocognitive disorder with Lewy bodies (G31.83)
- other frontotemporal neurocognitive disorder (G31.09)
- Parkinson's disease (G20.-)
- systemic lupus erythematosus (M32.-)
- traumatic brain injury (S06.-)
- vitamin B deficiency (E53.-)
Type 1 Excludes
- age related cognitive decline (R41.81)
- altered mental status (R41.82)
- cerebral degeneration (G31.9)
- change in mental status (R41.82)
- cognitive deficits following (sequelae of) cerebral hemorrhage or infarction (I69.01-I69.11-, I69.21-I69.31-, I69.81- I69.91-)
- dementia (F01.-, F02.-, F03.-)
- mild cognitive impairment due to unknown or unspecified etiology (G31.84)
- neurologic neglect syndrome (R41.4)
- personality change, nonpsychotic (F68.8)
ICD-10-CM Diagnosis Code R47.82
Fluency disorder in conditions classified elsewhere
Applicable To
- Stuttering in conditions classified elsewhere
Code First
- underlying disease or condition, such as:
- Parkinson's disease (G20.-)
Type 1 Excludes
- adult onset fluency disorder (F98.5)
- childhood onset fluency disorder (F80.81)
- fluency disorder (stuttering) following cerebrovascular disease (I69. with final characters -23)

ICD-10-CM Codes Adjacent To G20 G12.25 Progressive spinal muscle atrophy G12.29 Other motor neuron disease G12.8 Other spinal muscular atrophies and related syndromes G12.9 Spinal muscular atrophy, unspecified G13 Systemic atrophies primarily affecting central nervous system in diseases classified elsewhere G13.0 Paraneoplastic neuromyopathy and neuropathy G13.1 Other systemic atrophy primarily affecting central nervous system in neoplastic disease G13.2 Systemic atrophy primarily affecting the central nervous system in myxedema G13.8 Systemic atrophy primarily affecting central nervous system in other diseases classified elsewhere G14 Postpolio syndrome G20 Parkinson's disease G20.A Parkinson's disease without dyskinesia G20.A1 …… without mention of fluctuations G20.A2 …… with fluctuations G20.B Parkinson's disease with dyskinesia G20.B1 …… without mention of fluctuations G20.B2 …… with fluctuations G20.C Parkinsonism, unspecified G21 Secondary parkinsonism G21.0 Malignant neuroleptic syndrome G21.1 Other drug-induced secondary parkinsonism

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.

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2022 ICD-10-CM Diagnosis Code G20: Parkinson's Disease

Parkinson's disease

Dementia in other diseases classified elsewhere, unspecified severity, with anxiety

Dementia in other diseases classified elsewhere, mild, with anxiety

Dementia in other diseases classified elsewhere, moderate, with anxiety

Dementia in other diseases classified elsewhere, severe, with anxiety

Dementia in other diseases classified elsewhere, unspecified severity, with behavioral disturbance

Dementia in other diseases classified elsewhere, mild, with behavioral disturbance

Dementia in other diseases classified elsewhere, moderate, with behavioral disturbance

Dementia in other diseases classified elsewhere, severe, with behavioral disturbance

Dementia in other diseases classified elsewhere, unspecified severity, with mood disturbance

Dementia in other diseases classified elsewhere, mild, with mood disturbance

Dementia in other diseases classified elsewhere, moderate, with mood disturbance

Dementia in other diseases classified elsewhere, severe, with mood disturbance

Dementia in other diseases classified elsewhere, unspecified severity, with psychotic disturbance

Dementia in other diseases classified elsewhere, mild, with psychotic disturbance

Dementia in other diseases classified elsewhere, moderate, with psychotic disturbance

Dementia in other diseases classified elsewhere, severe, with psychotic disturbance

Dementia in other diseases classified elsewhere, unspecified severity, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety

Dementia in other diseases classified elsewhere, mild, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety

Dementia in other diseases classified elsewhere, moderate, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety

Dementia in other diseases classified elsewhere, severe, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety

Mild neurocognitive disorder due to known physiological condition

Dementia in other diseases classified elsewhere

Mild neurocognitive disorder due to known physiological condition

Fluency disorder in conditions classified elsewhere

ICD-10-Code: G20.00 Primäres Parkinson-Syndrom Mit Fehlender ...

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