ICD-10 Code F02 – Dementia in other diseases classified elsewhere (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F02 – Dementia in other diseases classified elsewhere
What it is
F02 identifies dementia caused by another underlying disease. Use it when the cognitive decline is documented as secondary to a known medical condition, not as a primary dementia disorder.
Clinical signs
Typical findings include memory loss, impaired reasoning, and reduced ability to manage daily activities. Clinical features vary; refer to documentation, especially for the underlying condition and any behavioral changes.
When to use this code
Use F02 when the record states dementia is due to another disease, such as a neurologic or systemic disorder. You should code the underlying condition first when instructed by ICD-10-CM guidelines, then add F02 to show the dementia manifestation.
Confirm that the provider documents a causal relationship. If the chart only says “dementia” without an associated disease, check documentation before assigning this code.
Do not use for
Do not use F02 for dementia without a documented underlying cause. Do not confuse it with other dementia codes when the condition is specified as a primary neurodegenerative dementia.
Coding tip
Always verify the linked disease and sequence the underlying condition correctly before reporting F02.