F03.91 represents a clinical classification for patients diagnosed with dementia where the specific underlying etiology (such as Alzheimer's, vascular, or Lewy body dementia) is not explicitly documented or determined, and the severity is not specified, but the patient is actively exhibiting behavioral disturbances. Behavioral and Psychological Symptoms of Dementia (BPSD) represent a heterogeneous group of non-cognitive symptoms and behaviors. This code is utilized when a physician documents behavioral symptoms—such as wandering, physical aggression, verbal outbursts, or other disruptive behaviors—as complicating the clinical picture of an unspecified dementia. In clinical practice, this code serves as a diagnostic placeholder when more specific diagnostic workups are pending or when documentation lacks the granularity to specify the stage (mild, moderate, or severe) or the exact causative pathology, yet management must address significant behavioral complications.
Distinguish between behavioral disturbance and psychosis when documenting unspecified dementia. Behavioral disturbance includes agitation, wandering, and verbal aggression, whereas psychosis requires the presence of hallucinations or delusions. If both are present, ICD-10-CM coding conventions prioritize the psychotic symptoms in certain hierarchies, but for F03.91, behavioral disturbances such as combativeness or physical aggression are primary.
Example: The patient is an 84-year-old male with chronic unspecified dementia, unspecified severity, currently exhibiting escalating physical aggression and wandering behavior. Behavioral disturbances have become unmanageable at home. Plan: Initiate low-dose risperidone for agitation control and refer to memory care facility. Billing Focus: Identification of behavioral disturbance justifies the specificity of the .91 subcategory. Risk Adjustment: This condition maps to HCC 52 (Dementia with Complications), which carries a higher risk weight than uncomplicated dementia.
Billing Focus: Documentation must explicitly state the presence of behavioral disturbances such as agitation or wandering to support the use of F03.91 over F03.90.
Ensure documentation reflects the diagnostic uncertainty regarding the underlying etiology of the dementia. If the physician has not yet determined if the dementia is due to Alzheimers disease, vascular disease, or another pathology, F03.91 is appropriate. However, once a specific cause is suspected or confirmed, the documentation should shift to the appropriate G30 or F01 codes to maintain high specificity.
Example: Evaluation for progressive memory loss and nighttime agitation in a 78-year-old female. Workup for B12 deficiency and thyroid dysfunction is negative; MRI brain shows generalized atrophy without focal infarcts. Diagnosis remains unspecified dementia at this time with active behavioral disturbance (sundowning). Billing Focus: The use of unspecified dementia (F03) is appropriate during the diagnostic workup phase before a definitive etiology is established. Risk Adjustment: Documentation of behavioral disturbance ensures the encounter is captured as a complex neurocognitive state.
Billing Focus: The code requires the documentation of unspecified severity; if mild, moderate, or severe is known, use F03.A1, F03.B1, or F03.C1 instead.
Document the specific nature of the behavioral disturbance to support medical necessity for complex evaluation and management. Common examples include physical combativeness, verbal outbursts, disruptive repetitive behaviors, and wandering. Linking these behaviors to the neurocognitive decline is essential for audit defense.
Example: Patient seen for follow-up of neurocognitive decline. Family reports increased combativeness during bathing and repetitive verbal outbursts. These behavioral disturbances are secondary to the patients unspecified dementia. Adjusted dosage of quetiapine to manage these symptoms. Billing Focus: Clearly linking the behavior to the dementia supports the clinical validity of F03.91. Risk Adjustment: Captures the increased complexity of managing a patient with safety risks such as combativeness.
Billing Focus: Specific behaviors like combativeness or wandering must be documented to validate the sixth character (1).
When a patient with dementia is admitted for an acute condition, such as a urinary tract infection, that causes delirium, document both the underlying dementia and the acute delirium. Behavioral disturbances inherent to the dementia (F03.91) are distinct from the acute altered mental status caused by infection.
Example: Patient with known unspecified dementia, unspecified severity, with behavioral disturbance (wandering), now presenting with acute delirium secondary to E. coli UTI. The baseline behavioral disturbances of wandering and agitation are exacerbated by the acute infection. Billing Focus: Coding both the dementia with behavioral disturbance and the delirium (F05) provides a complete clinical picture for reimbursement. Risk Adjustment: Both F03.91 and F05 are significant for risk adjustment and severity of illness (SOI) scores.
Billing Focus: Code both the underlying chronic condition (F03.91) and any acute superimposed conditions (F05) when appropriate.
Maintain documentation regarding the impact of behavioral disturbances on the patients safety and the necessity for caregiver intervention. This supports the medical necessity for higher-level E/M services or specialized neurocognitive assessments.
Example: 72-year-old male with unspecified dementia and behavioral disturbance characterized by frequent wandering into traffic and aggressive resistance to caregiver redirection. Requires 24-hour supervision for safety. Current medications: Donepezil 10mg and Memantine 10mg BID. Billing Focus: The risk of wandering and physical aggression supports a high level of medical decision making (99215). Risk Adjustment: Safety risks and behavioral interventions are markers of advanced disease progression and higher risk scores.
Billing Focus: Documentation of safety risks supports higher levels of Medical Decision Making (MDM).
Commonly used for dementia follow-ups where behavioral disturbances require medication adjustments or significant management changes.
Appropriate when behavioral disturbances present a significant risk to the patient or others, requiring intensive management or hospitalization discussion.
This code specifically includes the assessment of behavioral symptoms and the creation of a care plan for dementia patients.
Used for behavioral therapy or counseling for patients in early stages who can participate, or for managing behavioral reactions.
Utilized to screen for or quantify the severity of behavioral disturbances like agitation or depression in dementia.
Standard code for new patient presentations of cognitive decline with complicating behavioral symptoms.
Used for new patients presenting in crisis due to severe behavioral disturbances or safety concerns.
Common for managing dementia patients in long-term care settings who develop new behavioral disturbances.
Used in nursing facilities when behavioral disturbances are severe enough to threaten the placement or safety of the resident.
Essential for dementia patients with behavioral disturbances as the disease progresses and capacity diminishes.