ICD-10 Code F03.B1 – Unspecified Dementia, Moderate, with Behavioral Disturbance (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F03.B1 – Unspecified dementia, moderate, with behavioral disturbance
What it is
This code describes dementia of unspecified cause with a moderate level of severity and documented behavioral disturbance. Use it when the record does not identify a specific dementia type but does note behavioral symptoms.
Clinical signs
Clinical features vary; refer to documentation. Typical findings include impaired memory and thinking with moderate functional decline, along with behavioral disturbance such as agitation, aggression, wandering, or resistance to care.
When to use this code
Use this code when the provider documents unspecified dementia and states the condition is moderate. You also need clear documentation of behavioral disturbance linked to the dementia. If the record identifies a more specific dementia diagnosis, code that instead.
Do not use for
Do not use this code for dementia without behavioral disturbance or when severity is not documented. Do not assign it if the chart specifies a different dementia type, such as Alzheimer’s disease or vascular dementia.
Coding tip
Confirm both severity and behavioral disturbance in the provider note before assigning F03.B1.