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G31.84

Billable

Mild cognitive impairment of uncertain or unknown etiology

G31.84 is the ICD-10-CM code for Mild cognitive impairment of uncertain or unknown etiology. It is a billable, specific code valid for reimbursement.

Status
Billable
Chapter
G00-G99
Parent
G31.8
Edition
FY2026

G00-G99 Diseases of the nervous system

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)

Frequently asked questions

What is ICD-10 code G31.84?
G31.84 is the ICD-10-CM code for "Mild cognitive impairment of uncertain or unknown etiology". It falls under G00-G99 Diseases of the nervous system.
Is G31.84 a billable code?
Yes — G31.84 is a billable, specific ICD-10-CM code valid for reimbursement.
What is excluded from G31.84?
Excludes1 (not coded here): age related cognitive decline (R41.81); altered mental status (R41.82); cerebral degeneration (G31.9); cerebrovascular diseases (I60-I69).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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