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

G31.84

ICD-10 Chapter 6: Nervous System — illustrative image — Chapter 6: Diseases of the nervous system (G00–G99) — illustrative image

What this code means

Mild cognitive impairment means noticeable memory or thinking problems that are greater than expected for age but not dementia.

Also called: mild cognitive impairment, mci.

When this code is used

Used for mild cognitive impairment.

Where it sits in ICD-10-CM

Code G31.84 belongs to Chapter 6: Diseases of the nervous system, which covers codes G00–G99 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.

Related symptoms

Memory problems

Frequently asked questions

What is ICD-10-CM code G31.84?

G31.84 is the ICD-10-CM diagnosis code for “Mild cognitive impairment of uncertain or unknown etiology”. Mild cognitive impairment means noticeable memory or thinking problems that are greater than expected for age but not dementia.

When is code G31.84 used?

Used for mild cognitive impairment. It belongs to Chapter 6 of ICD-10-CM (Diseases of the nervous system).

This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.