2026 ICD-10-CM Diagnosis Code F03.918Unspecified dementia, unspecified severity, with other behavioral disturbance

ICD-10-CM Codes›F01–F99›F01-F09›F03

ICD-10-CM F03.918
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

F03.918 is a billable ICD-10-CM diagnosis code for unspecified dementia, unspecified severity, with other behavioral disturbance. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is restricted by the Medicare Code Editor to adult patients (age 15 through 124). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Neurocognitive disorders.

Code Identity

ICD-10-CM Code
F03.918
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified dementia, unspecified severity, with other behavioral disturbance
Short Description
Unsp dementia, unsp severity, with other behavioral disturb
Parent Code
F03.91
Unspecified dementia, unspecified severity, with behavioral disturbance

Code Classification

ChapterF01–F99Mental and behavioural disorders
SectionF01-F09Mental disorders due to known physiological conditions
CategoryF03Unspecified dementia
This CodeF03.918Unspecified dementia, unspecified severity, with other behavioral disturbance

Code EditsBilling

Medicare Code Editor checks that affect claim validity for F03.918.

Adult diagnoses
The Medicare Code Editor detects inconsistencies in adult cases by checking a patient's age and any diagnosis on the patient's record. The adult code edits apply to patients age range is 15–124 years inclusive (e.g., senile delirium, mature cataract).

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Aggression due to dementia
  • Alzheimer's disease with altered behavior
  • Anxiety due to dementia
  • Apathetic behavior due to dementia
  • Behavioral and psychological symptoms of dementia
  • Dementia with behavioral disturbance
  • Disinhibited behavior due to dementia
  • Indifference
  • Lack of emotional response
  • Post-traumatic dementia with behavioral change
  • Psychological sign or symptom
  • Psychological symptom due to dementia
  • Senile dementia with delusion
  • Senile dementia with depression
  • Senile dementia with depressive or paranoid features
  • Senile dementia with paranoia
  • Senile dementia with psychosis
  • Traumatic encephalopathy
  • Wandering
  • Wandering due to dementia

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Unspecified dementia, unspecified severity, with behavioral disturbances such as sleep disturbance, social disinhibition, or sexual disinhibition

Use Additional Code

  • code, if applicable, to identify wandering in unspecified dementia Z91.83

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Dementia(degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety)
      • with
        • behavioral disturbances (sexual disinhibition) (sleep disturbance) (social disinhibition)
    • Dementia(degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety)
      • with
        • behavioral disturbances (sexual disinhibition) (sleep disturbance) (social disinhibition)
          • specified NEC

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR NVS011
Neurocognitive disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Traumatic Encephalopathy

    encephalopathy resulting from trauma.

Patient EducationClinical

Dementia

Dementia is a loss of mental functions that is severe enough to affect your daily life and activities. These functions include:

The full article covers:

  • What is dementia?
  • What are the types of dementia?
  • Who is at risk for dementia?
  • What are the symptoms of dementia?
  • How is dementia diagnosed?
  • What are the treatments for dementia?
  • Can dementia be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code History & ChangesHistory

Replacement F03.918 replaces the following previously assigned code(s):

  • F03.91 - Unsp dementia, unspecified severity, with behavioral disturb
  • F03.91 - Unspecified dementia with behavioral disturbance
FY 2023AddedAdded to the ICD-10-CM code setEffective October 1, 2022.
FY 2024–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About F03.918Overview

Is F03.918 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report unspecified dementia, unspecified severity, with other behavioral disturbance on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Who can F03.918 be reported for?

The Medicare Code Editor checks unspecified dementia, unspecified severity, with other behavioral disturbance against patient demographics: this code is intended for adult patients (age 15 through 124). Claims outside these limits are flagged as inconsistent.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.