ICD-10-CM 2027 diagnosis code

F03.91Unspecified dementia, unspecified severity, with behavioral disturbance

Not billable — use a more specific code

F03.91 is a header code, so it can't be reported by itself. Choose one of the 2 more specific codes beneath it.Short description: Unsp dementia, unspecified severity, with behavioral disturb

Code last changed in FY2023 (effective October 1, 2022). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About F03.91

F03.91 is the ICD-10-CM diagnosis code for unspecified dementia, unspecified severity, with behavioral disturbance. It belongs to category F03 (unspecified dementia), 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 2 subcodes must be used instead.

Within F03.9 (unspecified dementia, unspecified severity), F03.91 is specifically for unspecified dementia, unspecified severity, with behavioral disturbance. Related codes cover without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety (F03.90), with psychotic disturbance (F03.92), with mood disturbance (F03.93) and with anxiety (F03.94).

To report this condition, pick the subcode that matches the documentation: F03.911 (agitation) and F03.918 (disturbance).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015, and changed in FY2023 (title revised).

Before ICD-10, this condition was coded in ICD-9-CM as 294.21 (dementia, unspecified, with behavioral disturbance).

Specific codes under F03.91

Notes that apply from higher levels

Instructions written at a parent level also apply to F03.91.

› From F03 Unspecified dementia

Excludes2

dementia with delirium or acute confusional state (F05)
mild memory disturbance due to known physiological condition (F06.8)

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

ICD-9-CM equivalent

Converter →

294.21Dementia, unspecified, with behavioral disturbanceexact

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

2016
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2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
FY2023 (effective 10/1/2022): Title revised — was “Unspecified dementia with behavioral disturbance”

Common questions about F03.91

Is F03.91 billable?: No. F03.91 is a header code. Report one of its more specific subcodes instead.
What is the ICD-9 code for F03.91?: The CMS General Equivalence Mappings map F03.91 to ICD-9-CM 294.21.