ICD-10-CM
ICD-10 code for Dementia (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety) Lewy body: G31.83
The ICD-10-CM index points "Dementia (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety) Lewy body" to G31.83, Neurocognitive disorder with Lewy bodies. G31.83 is a billable code. The index also gives F02.80 (Dementia in other diseases classified elsewhere, unspecified severity, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety) for the manifestation, the problem the disease causes. Report G31.83 first, then F02.80.
Source: CDC ICD-10-CM FY2027 Alphabetic Index file dated June 16, 2026. Publisher page
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Index subterms
A header groups codes and is not billed. A billable code is one you can report.
More specific codes in G31
A header groups codes and is not billed. A billable code is one you can report.
- G31Other degenerative diseases of nervous system, not elsewhere classifiedHeader
- G31.0Frontotemporal dementiaHeader
- G31.01Pick's diseaseBillable
- G31.09Other frontotemporal neurocognitive disorderBillable
- G31.1Senile degeneration of brain, not elsewhere classifiedBillable
- G31.2Degeneration of nervous system due to alcoholBillable
- G31.8Other specified degenerative diseases of nervous systemHeader
- G31.80Leukodystrophy, unspecifiedBillable
- G31.81Alpers diseaseBillable
- G31.82Leigh's diseaseBillable
- G31.83Neurocognitive disorder with Lewy bodiesBillable
- G31.84Mild cognitive impairment of uncertain or unknown etiologyBillable
- G31.85Corticobasal degenerationBillable
- G31.86Alexander diseaseBillable
- G31.87Primary progressive apraxia of speechBillable
- G31.89Other specified degenerative diseases of nervous systemBillable
- G31.9Degenerative disease of nervous system, unspecifiedBillable
Use additional code
The CDC tabular list says to add the code named here after this one when it applies.
Use additional code, if applicable, to identify mild neurocognitive disorders due to known physiological condition (F06.7-)
From G31. A note on a category applies to every code under it.
Use additional code, if applicable, for codes G31.0-G31.83, G31.85-G31.9, to identify:
- F02.84, F02.A4, F02.B4, F02.C4Dementia with anxiety
- F02.81-, F02.A1-, F02.B1-, F02.C1-Dementia with behavioral disturbance
- F02.83, F02.A3, F02.B3, F02.C3Dementia with mood disturbance
- F02.82, F02.A2, F02.B2, F02.C2Dementia with psychotic disturbance
- F02.80, F02.A0, F02.B0, F02.C0Dementia without behavioral disturbance
- F06.7-Mild neurocognitive disorder due to known physiological condition
Excludes2
Excludes2 means the other condition can be reported with this one when both are documented.
From G31. A note on a category applies to every code under it.
Related conditions
Related pages
- G31.83 code detailsNotes, nearby codes, CMS-HCC group
- Category G31Every code under it
- Chapter 6Diseases of the nervous system
- ICD-10 codes by conditionA to Z
- Check a list of ICD-10 codes
- Denial code CO-11Diagnosis does not support the procedure
- Denial code CO-146Diagnosis invalid for the date of service
- HCPCS Level II code lookup
Questions
What is the ICD-10 code for Dementia (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety) Lewy body?
The ICD-10-CM index points "Dementia (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety) Lewy body" to G31.83, Neurocognitive disorder with Lewy bodies. G31.83 is a billable code. The index also gives F02.80 (Dementia in other diseases classified elsewhere, unspecified severity, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety) for the manifestation, the problem the disease causes. Report G31.83 first, then F02.80.
Is G31.83 billable?
Yes. G31.83 is a billable code in the FY2027 ICD-10-CM file. Use a more specific code when the record documents one.
What documentation notes apply to G31.83?
The CDC tabular list gives 1 Excludes2 note (may be coded together when both are documented), 8 "use additional code" notes for G31.83 and the categories above it. They are listed on this page.
What chapter is G31.83 in?
Chapter 6. Diseases of the nervous system.
When do ICD-10-CM codes change?
Every October 1, with the new fiscal year file. Some years add April 1 updates. This page uses the FY2027 file, effective October 1, 2026.