Alphabetic Index FY2027

F02

Dementia in other diseases classified elsewhere

FY2027Chapter 5: Mental, Behavioral and Neurodevelopmental disorders/F01–F09 Mental disorders due to known physiological conditions

Non-billable headerNot valid on its own. Use one of the more specific codes under it.

F02 is a non-billable ICD-10-CM code category for dementia in other diseases classified elsewhere. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are F02.8 Dementia in other diseases classified elsewhere, unspecified severity; F02.A Dementia in other diseases classified elsewhere, mild; F02.B Dementia in other diseases classified elsewhere, moderate and F02.C Dementia in other diseases classified elsewhere, severe. Its coding notes include a Code first instruction, 1 Excludes1 entry and 3 Excludes2 entries.

Guidelines tip

From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.

Dementia codes depend on severity documented by the provider. If severity is not documented, the unspecified severity code is assigned. If severity progresses during an inpatient stay, one code is assigned for the highest level.

Guidelines I.C.5.dDementia: severityRead the official text

Code first

If the underlying condition listed here is present and known, sequence it first.

This code
  • the underlying physiological condition, such as:
    • Alzheimer's (G30.-)
    • cerebral lipidosis (E75.4)
    • Creutzfeldt-Jakob disease (A81.0-)
    • epilepsy and recurrent seizures (G40.-)
    • hepatolenticular degeneration (E83.01)
    • human immunodeficiency virus [HIV] disease (B20)
    • Huntington's disease (G10)
    • hypercalcemia (E83.52)
    • hypothyroidism, acquired (E00-E03.-)
    • intoxications (T36-T65)
    • Jakob-Creutzfeldt disease (A81.0-)
    • multiple sclerosis (G35-)
    • neurocognitive disorder with Lewy bodies (G31.83)
    • neurosyphilis (A52.17)
    • niacin deficiency [pellagra] (E52)
    • other frontotemporal neurocognitive disorder (G31.09)
    • Parkinson's disease (G20.-)
    • Pick's disease (G31.01)
    • polyarteritis nodosa (M30.0)
    • prion disease (A81.9)
    • systemic lupus erythematosus (M32.-)
    • traumatic brain injury (S06.-)
    • trypanosomiasis (B56.-, B57.-)
    • vitamin B deficiency (E53.8)

Excludes1

Not coded here. The listed conditions generally should not be reported together.

This code
  • mild neurocognitive disorder due to known physiological condition with or without behavioral disturbance (F06.7-)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

This code
Also from chapter/block level (1 note)
Inherited from Chapter 5 Mental, Behavioral and Neurodevelopmental disorders
  • symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)

Includes

Further defines or gives examples of the content of the category.

This code
  • Major neurocognitive disorder in other diseases classified elsewhere
Also from chapter/block level (1 note)
Inherited from Chapter 5 Mental, Behavioral and Neurodevelopmental disorders
  • disorders of psychological development

Notes

Also from chapter/block level (1 note)
Inherited from F01–F09 Mental disorders due to known physiological conditions
  • This block comprises a range of mental disorders grouped together on the basis of their having in common a demonstrable etiology in cerebral disease, brain injury, or other insult leading to cerebral dysfunction. The dysfunction may be primary, as in diseases, injuries, and insults that affect the brain directly and selectively; or secondary, as in systemic diseases and disorders that attack the brain only as one of the multiple organs or systems of the body that are involved.

Alphabetic Index terms

Terms the official Alphabetic Index lists for this code. 2 entries

More specific codes under F02 4