The ICD-10-CM code for unspecified dementia is F03.90 (Unspecified dementia, unspecified severity, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety), a billable code reported when dementia is documented without a specified type or associated disturbances.
Primary codes
Billable
Billable
Extension
—
7th character
—
POA exempt
No
Inclusion terms
- Dementia NOS
Coding risks
- Assigning when documentation supports a more specific code
Hierarchy
Code comparison
Compare key differences between related codes to select the most specific option.
| Code | Description | Scenario |
|---|---|---|
| F03.90 | Unspecified dementia, unspecified severity, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety | Dementia documented without specified severity or any behavioral, psychotic, mood, or anxiety disturbance. |
| F03.A0 | Unspecified dementia, mild, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety | Unspecified dementia documented as mild severity, with no behavioral, psychotic, mood, or anxiety disturbances noted. |
| F03.B0 | Unspecified dementia, moderate, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety | Dementia documented as moderate severity with no behavioral, psychotic, mood, or anxiety symptoms noted. |
| F03.C0 | Unspecified dementia, severe, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety | Dementia documented as severe with no behavioral, psychotic, mood, or anxiety symptoms noted. |
| F03.911 | Unspecified dementia, unspecified severity, with agitation | Dementia with documented agitation, severity not specified in the chart. |
| F03.918 | Unspecified dementia, unspecified severity, with other behavioral disturbance | Dementia with behavioral disturbance other than agitation documented, severity not specified. |
Select the most specific code supported by the encounter documentation. More specific codes improve reimbursement accuracy and reduce audit risk.
Code ranges
Unspecified dementia
Dementia coded without specifying the underlying etiology, further classified by severity and presence of behavioral, psychotic, mood, or anxiety features.
Mental disorders due to known physiological conditions
Mental and behavioral disorders attributable to identifiable brain disease, injury, or systemic physiological dysfunction affecting cerebral function.
Vascular dementia
Dementia resulting from cerebrovascular disease, including multi-infarct and post-stroke cognitive decline, classified by severity and associated symptoms.
Dementia in other diseases classified elsewhere
Dementia occurring as a manifestation of an underlying condition such as Alzheimer, Parkinson, or Huntington disease, requiring etiology code first.
Alzheimer disease
Degenerative brain disease characterized by progressive cognitive decline, classified by onset as early or late.
Coding risks
Avoid these common coding issues when reporting Dementia.
Impact
Assigning F03.90 without stated etiology may miscode when Alzheimer's (G30) or vascular dementia (F01) is actually supported.
Mitigation
Consider querying the provider when etiology is absent rather than defaulting to F03 based on age or clinical presentation alone.
Related codes
Ancillary and co-coding
Codes commonly reported with the primary diagnosis on the same claim.
Z-code variants
Family history, personal history, or screening encounter codes related to this condition.
Differential codes
Alternative or commonly confused codes to consider when documentation suggests a different condition than the primary diagnosis.
Frequently asked questions
Use F03.90 only when documentation does not specify an underlying etiology such as Alzheimer's, vascular, or Lewy body disease.
References
Compiled from the following authoritative coding references. Last updated 2026-08-04.