G31.83

Billable

ChapterG00–G99

Ranksubcategory

Official Description

Neurocognitive disorder with Lewy bodies

Metadata & Insights

•2026 ICD-10-CM Edition - Effective October 1, 2025.
•Billable/specific code (valid for reimbursement).
•Chapter 6: Diseases of the Nervous System (G00-G99).

Instructional Notes

Includes

Lewy body dementia
Lewy body disease

Use Additional Code

code, if applicable, to identify mild neurocognitive disorders due to known physiological condition (F06.7-)

General instructions are available for the parent sections:

View CH6 Notes View G31 Notes

Clinical Hierarchy

CH6Diseases of the nervous system (G00-G99)

G30-G32Other degenerative diseases of the nervous system (G30-G32)

G31Other degenerative diseases of nervous system, not elsewhere classified

G31.8Other specified degenerative diseases of nervous system

G31.83Neurocognitive disorder with Lewy bodies

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to G31.83:

categoryG31

Other degenerative diseases of nervous system, not elsewhere classified

View context instructions

chapterCH6

Diseases of the nervous system (G00-G99)

View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to G31.83. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

8 raw paths

Dementia (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety)4 unique routes

Lewy body→G31.83(2 variants)

with behavioral disturbance→G31.83

with(2 variants)

Lewy bodies→G31.83(2 variants)

with behavioral disturbance→G31.83

Disease, diseased2 unique routes

Lewy body (dementia)→G31.83(2 variants)

with behavioral disturbance→G31.83

Disorder (of)1 unique routes

neurocognitive

with Lewy bodies→G31.83

Lewy body (ies) (disease)1 unique routes

Direct index entry→G31.83

MS-DRG Classification

2026 v43.1

This code is grouped within the following Diagnosis Related Group(s) for clinical reimbursement:

DRG 056

Degenerative Nervous System Disorders with MCC

DRG 057

Degenerative Nervous System Disorders without MCC

Cross Reference

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