Mild cognitive impairment of uncertain or unknown etiology

ValidICD-10-CM diagnosis code.

Valid for claims with a date of service in the current code year.

Valid FY2016 onwards.

What has happened to this code

Every change the publisher made, from 2007 to now. Entries marked draft are from the pre-implementation releases: ICD-10 took effect on 1 October 2015, so nothing before FY2016 was ever valid on a claim.

FY2007 Added to the draft code set draft Mild cognitive impairment, so stated
FY2023 Description revised ~~Mild cognitive impairment, so stated~~ Mild cognitive impairment of uncertain or unknown etiology

Official coding rules

Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.

Inherited from G31 Other degenerative diseases of nervous system, not elsewhere classified

Excludes2 - not included here

Reye's syndrome (G93.7)

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-)

How CDC's index refers to this code

Wording from the official alphabetic index. Much of it appears nowhere in the code description, which is why a search for the everyday phrase so often finds nothing.

Disorder > neurocognitive > mild
Disorder > mild neurocognitive
Disorder > neurocognitive > mild
Impaired, impairment > mild cognitive
Impaired, impairment > cognitive, mild, of uncertain or unknown etiology
Impaired, impairment > mild cognitive > of uncertain or unknown etiology

Codes in the same group

Code	Description	Status
G31.80	Leukodystrophy, unspecified	Valid
G31.81	Alpers disease	Valid
G31.82	Leigh's disease	Valid
G31.83	Neurocognitive disorder with Lewy bodies	Valid
G31.85	Corticobasal degeneration	Valid
G31.86	Alexander disease	Valid
G31.87	Primary progressive apraxia of speech	Valid
G31.89	Other specified degenerative diseases of nervous system	Valid