G31.84

G31.84: Mild cognitive impairment of uncertain or unknown etiology

Billable / specific codeICD-10-CM

G31.84 is a billable, specific ICD-10-CM code for mild cognitive impairment of uncertain or unknown etiology. It is valid for submission on a claim.

Check G31.84 with the rest of the claim: free scrubber

Excludes1: never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

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

Add a secondary code to capture the detail described below.

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)

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

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

Excludes2 inherited from the categories above G31.84

Not part of this code, but both may be coded when both are present.

Written on G31: Other degenerative diseases of nervous system, not elsewhere classified

Reye's syndrome (G93.7)

Other codes that can never be billed with G31.84

Their own Excludes1 notes name this code, so the conflict is not listed above.

F06.7Mild neurocognitive disorder due to known physiological condition
F07.0Personality change due to known physiological condition
R41Other symptoms and signs involving cognitive functions and awareness

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Medicare coverage

G31.84 is named in 9 Medicare coverage policies: 7 listing it as supporting medical necessity, and 2 listing it as NOT covered. Which one applies depends on your Medicare contractor.

A52434Health and Behavior Assessment/Intervention – Medical Policy Articlenot covered
A56562Billing and Coding: Health and Behavior Assessment/Interventionnot covered
A54111Billing and Coding: Speech Language Pathology (SLP) Services: Communication Disorders
A56612Billing and Coding: CT of the Head

Alphabetic index entries that lead here

Disorder›mild neurocognitive
Impaired, impairment›cognitive, mild, of uncertain or unknown etiology
Impaired, impairment›mild cognitive
Disorder›neurocognitive›mild(of uncertain or unknown etiology)
Impaired, impairment›mild cognitive›of uncertain or unknown etiology

Code history

Unchanged in every release from FY2024 to FY2027.