ICD-10 Code F01.C18 – Vascular dementia, severe, with other behavioral disturbance (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F01.C18 – Vascular dementia, severe, with other behavioral disturbance
What it is
This code identifies severe vascular dementia, where cognitive decline is caused by cerebrovascular disease. The “other behavioral disturbance” qualifier means the record documents behavioral symptoms not captured by more specific dementia codes.
Clinical signs
Expect marked impairment in memory, thinking, judgment, and daily function, with a vascular pattern of onset or progression. Clinical features vary; refer to documentation for the specific behavioral disturbance and severity.
When to use this code
Use this code when the provider documents vascular dementia as severe and also describes an additional behavioral disturbance. The note should support both the dementia type and the severity level. If the behavior is not specified, Check documentation.
Do not use for
Do not use this code for dementia due to other causes, such as Alzheimer disease, or for vascular dementia without documented severe severity. Do not assume the behavioral disturbance category without provider support.
Coding tip
Code only when the record clearly supports vascular dementia, severe stage, and a separate behavioral disturbance term.