ICD-10 Code F02.A – Dementia in other diseases classified elsewhere, mild (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F02.A – Dementia in other diseases classified elsewhere, mild
What it is
This code identifies mild dementia caused by another underlying disease, such as a neurologic or systemic condition. Use it when the record links the cognitive decline to that separate disease.
Clinical signs
Clinical features vary; refer to documentation. Mild dementia usually includes measurable memory or thinking problems with preserved basic daily function, and the provider should document the underlying disease relationship.
When to use this code
Use F02.A when the clinician documents mild dementia secondary to another condition and names that cause in the record. It is appropriate when the dementia is not coded as a primary degenerative dementia. If the underlying disease is not stated clearly, check documentation.
Do not use for
Do not use this code for dementia without an identified underlying disease or for more advanced dementia severity. Do not use it when the note only describes cognitive decline without a confirmed dementia diagnosis.
Coding tip
Always code the underlying disease first when documentation supports a causal link, then add F02.A for the mild dementia.