ICD-10 Code F02.818 – Dementia in other diseases classified elsewhere, unspecified severity, with other behavioral disturbance (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F02.818 – Dementia in other diseases classified elsewhere, unspecified severity, with other behavioral disturbance
What it is
This code identifies dementia caused by another underlying disease, with the severity not specified and behavioral disturbance present. Use it when the record links the dementia to a separate condition and documents additional behavior changes.
Clinical signs
Clinical features vary; refer to documentation. Commonly documented findings include memory loss, impaired judgment, confusion, and behavioral symptoms such as agitation, wandering, or other disruptive behavior.
When to use this code
Use F02.818 when the provider states dementia is due to another disease, but does not specify severity, and notes a behavioral disturbance. The underlying disease should also be documented and coded as instructed. If the chart does not clearly connect the dementia to the other condition, check documentation.
Do not use for
Do not use this code for dementia without behavioral disturbance or when the cause is not linked to another disease. Do not use it if the severity is specified differently or the record supports a more precise code.
Coding tip
Always code the underlying disease first when documentation supports dementia due to another condition.