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ICD-10-CM 2027 diagnosis code

F03Unspecified dementia

Not billable — use a more specific code

F03 is a header code, so it can't be reported by itself. Choose one of the 4 more specific codes beneath it.

Looking up by condition? See ICD-10 code for Presbyophrenia, ICD-10 code for Senile insanity, ICD-10 code for Senile paranoia, ICD-10 code for Senile dementia).

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About F03

F03 is the ICD-10-CM diagnosis code for unspecified dementia. It belongs to block F01-F09 (mental disorders due to known physiological conditions) and chapter 5 (mental, Behavioral and Neurodevelopmental disorders). It is a header code, so it can't be reported by itself; one of its 4 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: F03.9 (unspecified severity), F03.A (mild), F03.B (moderate) and F03.C (severe).

The conditions in its Excludes2 note aren't part of F03, but may be coded alongside it if the patient has both: dementia with delirium or acute confusional state (F05) and mild memory disturbance due to known physiological condition (F06.8).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under F03

Coding notes

Applicable toConditions and synonyms classified to this code
  • Major neurocognitive disorder NOS
  • Presenile dementia NOS
  • Presenile psychosis NOS
  • Primary degenerative dementia NOS
  • Senile dementia NOS
  • Senile dementia depressed or paranoid type
  • Senile psychosis NOS
Excludes2Not included here — may be reported together if both conditions exist
  • dementia with delirium or acute confusional state (F05)
  • mild memory disturbance due to known physiological condition (F06.8)

Notes that apply from higher levels

Instructions written at a parent level also apply to F03.

Broader instructions also apply from F01-F09 Mental disorders due to known physiological conditions and Chapter 5: Mental, Behavioral and Neurodevelopmental disorders.

Alphabetic index entries

33 entries

Terms in the official ICD-10-CM index that lead to F03.

Codes whose notes reference F03

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about F03

Is F03 billable?

No. F03 is a header code. Report one of its more specific subcodes instead.