G31 ICD-10-CM Code: Other degenerative diseases of nervous system, not elsewhere classified
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Code definition
Official description
G31Other degenerative diseases of nervous system, not elsewhere classified
ICD-10-CM diagnosis code · United States clinical modification
Classification
Where G31 sits
- 1
Chapter 6
Diseases of the nervous system (G00-G99)
- 2
Section
Other degenerative diseases of the nervous system (G30-G32)
- 3
Category G31
Other degenerative diseases of nervous system, not elsewhere classified
- 4
Code G31
Other degenerative diseases of nervous system, not elsewhere classified
More specific choices
Codes under G31
G31 is a non-billable category. Choose the child code that best matches the documented diagnosis.
Documentation details
Notes for this code
Inclusion terms
No inclusion terms are listed for G31.
Code first
No “code first” instruction is listed for G31.
Use additional code
- code, if applicable, for codes G31.0-G31.83, G31.85-G31.9, 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-)
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for G31.
Excludes2
Conditions not included here that may be reported separately when present.
- Reye's syndrome (G93.7)
Transparency
Source and release
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Review the CDC/NCHS ICD-10-CM sourceCode-specific guidance
Frequently asked questions
What does ICD-10-CM code G31 mean?
G31 is the FY 2027 U.S. ICD-10-CM code for “Other degenerative diseases of nervous system, not elsewhere classified.”
Is G31 a billable or specific ICD-10-CM code?
No. G31 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.
Where is G31 located in ICD-10-CM?
G31 is listed in Chapter 6, Diseases of the nervous system (G00-G99), within Other degenerative diseases of the nervous system (G30-G32) (G30–G32), under category G31, Other degenerative diseases of nervous system, not elsewhere classified.
What coding notes are listed for G31?
No inclusion terms are listed for G31 in this reference record. No code-first instruction is listed. Additional-code instructions: code, if applicable, for codes G31.0-G31.83, G31.85-G31.9, 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-). No Excludes1 note is listed. Excludes2 notes: Reye's syndrome (G93.7).
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