f02

F02 is a code within the ICD-10 classification system used to record dementia that is secondary to another medical condition. It stands for "dementia in diseases classified elsewhere" and is employed when a patient has cognitive impairment meeting dementia criteria but the underlying disease responsible for the dementia has its own diagnostic code.

Examples include dementia arising in the course of Alzheimer's disease, Parkinson's disease, Huntington's disease, cerebrovascular disease, HIV infection, or other neurological or systemic conditions. The use of F02 allows coders to separate the dementia syndrome from the primary disease for billing and statistical purposes.

Diagnosis and coding guidelines: Clinicians assess cognitive decline, functional impairment, and the relationship to the underlying condition; the underlying disease is coded separately, and F02 is used as a secondary code to indicate the dementia. If the underlying cause is not identified, other dementia codes may be used (for unspecified cases).

Clinical management: Treatment targets the primary disease and the dementia symptoms; management is multidisciplinary including medical, social, and caregiver support.

Epidemiology and notes: Dementia secondary to another disease is common in older adults and in chronic diseases; coding practices vary by jurisdiction; in ICD-11, the structure changed and this category may be represented differently.