F03.91 ICD-10-CM

ICD-10-CM code F03.91 describes unspecified dementia with behavioral disturbance. Unspecified-cause dementia with behavioral or psychological symptoms. It is a billable, specific code valid for claim submission. It is grouped under the “Neurocognitive & Organic Disorders” section of the mental, behavioral, and neurodevelopmental disorders chapter.

When to use F03.91

Assign a code in this group when a mental or behavioral disturbance is caused by a known physiological condition, such as delirium, dementia, or another organic mental disorder. Base the selection on the documented medical workup and the specific cognitive or behavioral presentation. For F03.91 specifically, unspecified-cause dementia with behavioral or psychological symptoms.

Documentation & billing

Document the underlying etiology, the cognitive or behavioral findings, and whether a behavioral disturbance is present. Pair with an etiology code (for example Alzheimer disease G30.9 or a cerebrovascular code) when the cause is identified.

Common pitfalls

• Coding dementia without documenting whether a behavioral disturbance is present.
• Omitting the underlying etiology code when the cause is known.
• Confusing acute delirium (F05) with chronic dementia.

Common search terms for F03.91

Clinicians often look up F03.91 using plain-language terms. This code maps to:

Frequently asked questions