ICD-10-CM Codes
G00-G99
G30-G32
G31-
2023 ICD-10-CM Diagnosis Code G31

2023 ICD-10-CM Diagnosis Code G31

Other degenerative diseases of nervous system, not elsewhere classified

2016

2017

2018

2019

2020

2021

2022

2023

Non-Billable/Non-Specific Code

G31 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
Short description: Oth degenerative diseases of nervous system, NEC
The 2023 edition of ICD-10-CM G31 became effective on October 1, 2022.
This is the American ICD-10-CM version of G31 - other international versions of ICD-10 G31 may differ.

Use Additional

Use Additional Help

Certain 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.

For codes
ICD-10-CM Diagnosis Code G31.0
Frontotemporal dementia
G31.0-
ICD-10-CM Diagnosis Code G31.83
Neurocognitive disorder with Lewy bodies
Applicable To
- Lewy body dementia
- Lewy body disease
Use Additional
- code, if applicable, to identify mild neurocognitive disorders due to known physiological condition (F06.7-)
G31.83
,
ICD-10-CM Diagnosis Code G31.85
Corticobasal degeneration
G31.85-
ICD-10-CM Diagnosis Code G31.9
Degenerative disease of nervous system, unspecified
G31.9
, use additional 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.-)
- frontotemporal neurocognitive disorder (G31.09)
- human immunodeficiency virus [HIV] disease (B20)
- Huntington's disease (G10)
- Neurocognitive disorder with Lewy bodies (G31.83)
- 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-
)

Type 2 Excludes

Type 2 Excludes Help

A type 2 excludes note represents "not included here". A type 2 excludes note indicates that the condition excluded is not part of the condition it is excluded from but a patient may have both conditions at the same time. When a type 2 excludes note appears under a code it is acceptable to use both the code (G31) and the excluded code together.

Reye's syndrome (
ICD-10-CM Diagnosis Code G93.7
Reye's syndrome
Code First
- poisoning due to salicylates, if applicable (T39.0-, with sixth character 1-4)
Use Additional
- code for adverse effect due to salicylates, if applicable (T39.0-, with sixth character 5)
G93.7
)

The following code(s) above G31 contain annotation back-references

Annotation Back-References

In 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 G31:

G00-G99
2023 ICD-10-CM Range G00-G99
Diseases of the nervous system
Type 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

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

ICD-10-CM Codes Adjacent To G31

G25.82 Stiff-man syndrome

G25.83 Benign shuddering attacks

G25.89 Other specified extrapyramidal and movement disorders

G25.9 Extrapyramidal and movement disorder, unspecified

G26 Extrapyramidal and movement disorders in diseases classified elsewhere

G30 Alzheimer's disease

G30.0 Alzheimer's disease with early onset

G30.1 Alzheimer's disease with late onset

G30.8 Other Alzheimer's disease

G30.9 Alzheimer's disease, unspecified

G31 Other degenerative diseases of nervous system, not elsewhere classified

G31.0 Frontotemporal dementia

G31.01 Pick's disease

G31.09 Other frontotemporal neurocognitive disorder

G31.1 Senile degeneration of brain, not elsewhere classified

G31.2 Degeneration of nervous system due to alcohol

G31.8 Other specified degenerative diseases of nervous system

G31.81 Alpers disease

G31.82 Leigh's disease

G31.83 Neurocognitive disorder with Lewy bodies

G31.84 Mild cognitive impairment of uncertain or unknown etiology

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

2023 ICD-10-CM Diagnosis Code G31

Other degenerative diseases of nervous system, not elsewhere classified

Frontotemporal dementia

Neurocognitive disorder with Lewy bodies

Corticobasal degeneration

Degenerative disease of nervous system, unspecified

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

Reye's syndrome

Diseases of the nervous system