Understanding Dementia, Unspecified, Without Behavioral Disturbance: ICD-10 Code F03.90

What This Code Means

ICD-10-CM code F03.90 is the standardized medical code used to document Dementia, Unspecified, Without Behavioral Disturbance in patient health records. It applies when a clinician has confirmed that dementia is present, but the specific cause — Alzheimer's disease, vascular dementia, Lewy body dementia, frontotemporal dementia, or another — has not yet been determined or documented.

F03.90 often functions as a working diagnosis: a placeholder that lets care continue and bills be processed while imaging, neuropsychological testing, lab workup, or specialist referrals proceed. In other cases — particularly with older adults whose workup is unlikely to change management — F03.90 is used as the long-term diagnosis because further subtyping wouldn't meaningfully change the care plan.

The trailing .90 specifies without behavioral disturbance. If symptoms like agitation, aggression, wandering, or psychosis are documented, the code becomes F03.91 instead. The behavioral specifier matters for care planning and can affect coverage of certain services.

Why Are There So Many Similar Codes?

You might wonder why one "dementia" code isn't enough. Dementia coding is layered for a reason — the underlying cause changes prognosis, treatment, and what kind of help a family should plan for. ICD-10 distinguishes between:

• Underlying cause: Alzheimer's (G30.x), vascular (F01.x), Lewy body (G31.83), frontotemporal (G31.0x), and dementia secondary to other diseases (F02.x) each have their own codes
• Specificity: When the cause isn't known or documented, F03.9x captures dementia in general
• Behavioral disturbance: The fifth digit distinguishes "without" (.90) from "with" (.91), since behavioral symptoms drive a large share of family burden and service needs
• Stage and severity: Newer ICD-10-CM updates add severity specifiers (mild, moderate, severe) that some clinicians now append

Accurate coding is important because it determines insurance coverage of cognitive testing, care planning visits, home health, and disease-specific medications. When a more specific cause becomes known, providers will typically replace F03.90 with the more precise code on subsequent visits.

What This Means for Your Care

Having F03.90 in your medical record means your healthcare team has documented dementia — without a named cause and without behavioral symptoms — as part of your health profile. This information follows you across providers and specialists and helps justify cognitive evaluations, care planning, and supportive services.

F03.90 commonly appears alongside extended evaluation and management visits (CPT 99214 or 99215) and the dedicated Cognitive Assessment and Care Plan service (CPT 99483), which Medicare pays for once per year and which produces a written care plan. If you see this code on a medical bill or explanation of benefits (EOB), it is the diagnosis your provider used to justify the services performed.

If you believe the code doesn't accurately reflect your situation — for example, if a more specific cause has already been identified, or if behavioral symptoms have been clearly documented — it's worth raising with your provider's billing department. Coding errors are more common than most people realize.

Tools like VisitRecall can help you keep track of what your doctor discussed during your visit, making it easier to verify that your diagnosis codes match what was actually said in your appointment.

Understanding the Code Structure

ICD-10-CM codes follow a hierarchical structure. Here is how F03.90 (Dementia, Unspecified, Without Behavioral Disturbance) fits within the classification:

How This Code Is Used

When your doctor documents dementia without a named cause and without behavioral disturbance, the diagnosis is recorded using ICD-10-CM code F03.90. This code appears in your electronic health record (EHR), on insurance claims, and on any medical bills related to the visit.

• Insurance claims: Your provider submits F03.90 to your insurance company to justify cognitive evaluations, care planning visits, and ongoing follow-up.
• Medical records: The code is stored in your EHR so every provider on your care team understands that dementia has been diagnosed.
• Billing: F03.90 is commonly paired with extended visit codes (CPT 99214/99215) and the Cognitive Care Plan service (CPT 99483) to show why the time spent was medically necessary.
• Public health: Aggregated F03.90 data helps researchers and public health agencies track how often dementia is documented before a specific cause is identified.

Related Diagnosis Codes

Sources

• MedlinePlus: Neurologic Diseases · U.S. National Library of Medicine
• MedlinePlus: Brain and Nervous System · U.S. National Library of Medicine