2026 ICD-10-CM Diagnosis Code F03.A18Unspecified dementia, mild, with other behavioral disturbance
ICD-10-CM Codes›F01–F99›F01-F09›F03
- Billable — Valid for Submission
- Chronic Condition
F03.A18 is a billable ICD-10-CM diagnosis code for unspecified dementia, mild, 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
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for F03.A18.
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Unspecified dementia, mild, 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
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
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)
- mild
- with
- behavioral disturbances (sexual disinhibition) (sleep disturbance) (social disinhibition)
- Dementia(degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety)
- mild
- with
- behavioral disturbances (sexual disinhibition) (sleep disturbance) (social disinhibition)
- specified NEC
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Code History & ChangesHistory
Replacement F03.A18 replaces the following previously assigned code(s):
- F03.91 - Unsp dementia, unspecified severity, with behavioral disturb
- F03.91 - Unspecified dementia with behavioral disturbance
Questions About F03.A18Overview
Is F03.A18 (Unspecified dementia, mild, with behavioral disturbance) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report unspecified dementia, mild, with other behavioral disturbance on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Who can F03.A18 be reported for?
The Medicare Code Editor checks unspecified dementia, mild, 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.
