G31.84

Billable

ChapterG00–G99

Ranksubcategory

Official Description

Mild cognitive impairment of uncertain or unknown etiology

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

Mild cognitive disorder NOS
Mild neurocognitive disorder of uncertain or unknown etiology

Excludes1(Not coded here)

age related cognitive decline (R41.81)
altered mental status (R41.82)
cerebral degeneration (G31.9)
cerebrovascular diseases (I60-I69)
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-)
cognitive impairment due to intracranial or head injury (S06.-)
dementia (F01.-, F02.-, F03.-)
mild neurocognitive disorder due to a known physiological condition (F06.7-)
neurologic neglect syndrome (R41.4)
personality change, nonpsychotic (F68.8)

Use Additional Code

code to identify presence of:
alcohol abuse and dependence (F10.-)
exposure to environmental tobacco smoke (Z77.22)
history of tobacco dependence (Z87.891)
hypertension (I10-I1A)
occupational exposure to environmental tobacco smoke (Z57.31)
tobacco dependence (F17.-)
tobacco use (Z72.0)

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

G31.84Mild cognitive impairment of uncertain or unknown etiology

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to G31.84:

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 G31.84. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

5 raw paths

Disorder (of)2 unique routes

mild neurocognitive→G31.84

neurocognitive

mild (of uncertain or unknown etiology)→G31.84

Impaired, impairment (function)3 unique routes

cognitive, mild, of uncertain or unknown etiology→G31.84

mild cognitive→G31.84(2 variants)

of uncertain or unknown etiology→G31.84