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ICD-10-CM Current in FY 2027

G31.84

Mild cognitive impairment of uncertain or unknown etiology

Release
FY 2027
Effective
Official source (opens in a new tab)

Hierarchy

Where G31.84 sits in the official hierarchy. Each level is the code it is classified under.

  1. G31 Other degenerative diseases of nervous system, not elsewhere classified
  2. G31.8 Parent Other specified degenerative diseases of nervous system
  3. G31.84 This code Mild cognitive impairment of uncertain or unknown etiology

Official Coding Notes

Reproduced verbatim from the FY 2027 ICD-10-CM files. Notes labelled as inherited are declared on a parent code and apply here too.

Inclusion Terms

Mild cognitive disorder NOS

Inclusion Terms

Mild neurocognitive disorder of uncertain or unknown etiology

Excludes1

age related cognitive decline ( R41.81 )

Excludes1

altered mental status ( R41.82 )

Excludes1

cerebral degeneration ( G31.9 )

Excludes1

cerebrovascular diseases (I60-I69)

Excludes1

change in mental status ( R41.82 )

Excludes1

cognitive deficits following (sequelae of) cerebral hemorrhage or infarction ( I69.01- , I69.11- , I69.21- , I69.31- , I69.81- , I69.91- )

Excludes1

cognitive impairment due to intracranial or head injury ( S06 .-)

Excludes1

dementia ( F01 .-, F02 .-, F03 .-)

Excludes1

mild neurocognitive disorder due to a known physiological condition ( F06.7- )

Excludes1

neurologic neglect syndrome ( R41.4 )

Excludes1

personality change, nonpsychotic ( F68.8 )

Excludes2

Reye's syndrome ( G93.7 )

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

Use Additional Code

code, if applicable, for codes G31.0-G31.83, G31.85-G31.9, to identify:

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

Use Additional Code

dementia with anxiety ( F02.84 , F02.A4 , F02.B4 , F02.C4 )

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

Use Additional Code

code to identify presence of:

Use Additional Code

dementia with behavioral disturbance ( F02.81- , F02.A1- , F02.B1- , F02.C1- )

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

Use Additional Code

alcohol abuse and dependence ( F10 .-)

Use Additional Code

dementia with mood disturbance ( F02.83 , F02.A3 , F02.B3 , F02.C3 )

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

Use Additional Code

exposure to environmental tobacco smoke ( Z77.22 )

Use Additional Code

dementia with psychotic disturbance ( F02.82 , F02.A2 , F02.B2 , F02.C2 )

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

Use Additional Code

history of tobacco dependence ( Z87.891 )

Use Additional Code

dementia without behavioral disturbance ( F02.80 , F02.A0 , F02.B0 , F02.C0 )

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

Use Additional Code

hypertension (I10-I1A)

Use Additional Code

mild neurocognitive disorder due to known physiological condition ( F06.7- )

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

Use Additional Code

occupational exposure to environmental tobacco smoke ( Z57.31 )

Use Additional Code

tobacco dependence ( F17 .-)

Use Additional Code

tobacco use ( Z72.0 )

Version History

How G31.84 appears in each release imported from the official files, newest first.

  1. FY 2027 Effective

    Current

    Mild cognitive impairment of uncertain or unknown etiology

  2. FY 2026 Effective

    Unchanged

    Mild cognitive impairment of uncertain or unknown etiology

Related Codes

Other codes under G31.8

Codes whose official notes reference G31.84

Data Source

Code information on this page is derived from the FY 2027 ICD-10-CM files published by CDC NCHS and CMS.

Release
FY 2027
Effective
Source file
icd10cm-code-descriptions-2027.zip

Official ICD-10-CM source files (opens in a new tab)

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