In simple words: This code represents dementia (loss of memory and other mental abilities) caused by a disease other than Alzheimer's or problems with blood vessels in the brain.It indicates that the person does not have noticeable behavioral problems like agitation or hallucinations.The specific disease causing the dementia is coded separately.

Dementia in other diseases classified elsewhere, unspecified severity, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety. This code is used for cases of dementia due to causes other than Alzheimer's disease or cerebrovascular disease. The underlying physiological condition should be coded first.

Example 1: A patient with Parkinson's disease develops dementia, but without behavioral disturbances. The underlying Parkinson's disease is coded first (G20), followed by F02.80., A patient with HIV develops dementia due to the infection, without behavioral disturbances. HIV (B20) is coded first, then F02.80., A patient diagnosed with hypothyroidism develops dementia.  The dementia is without behavioral disturbance.  Hypothyroidism (E03.-) is coded first followed by F02.80.

Documentation should include the type of dementia, the underlying physiological condition, the severity of the dementia, and the absence of behavioral disturbances. Supporting documentation such as neuropsychological evaluations, laboratory results, and imaging studies should also be included.

** Use Z91.83 (wandering in diseases classified elsewhere) if appropriate in conjunction with the correct dementia codes.