ICD-10 Code F02.C3 – Dementia in other diseases classified elsewhere, severe, with mood disturbance (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F02.C3 – Dementia in other diseases classified elsewhere, severe, with mood disturbance
What it is
This code identifies severe dementia caused by another underlying disease, with mood disturbance documented. It is used when dementia is not the primary disease but a complication of a separate condition.
Clinical signs
Expect marked cognitive decline with major loss of independent functioning, plus documented mood symptoms such as depression, anxiety, or emotional lability. Clinical features vary; refer to documentation.
When to use this code
Use this code when the record clearly states severe dementia due to another disease and also documents mood disturbance. The underlying condition should be identified elsewhere in the chart and coded as directed. Check documentation if severity or mood features are not explicit.
Do not use for
Do not use this code for dementia without a documented mood disturbance, or when the cause is not specified as another disease. Do not assign it if the chart only describes mild or unspecified dementia.
Coding tip
Confirm both the severity and the mood disturbance before assigning F02.C3.