2026 ICD-10-CM Diagnosis Code F03.C4Unspecified dementia, severe, with anxiety

ICD-10-CM Codes›F01–F99›F01-F09›F03

ICD-10-CM F03.C4
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

F03.C4 is a billable ICD-10-CM diagnosis code for unspecified dementia, severe, with anxiety. 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.C4
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified dementia, severe, with anxiety
Short Description
Unspecified dementia, severe, with anxiety
Same as the full description in the CMS dataset.
Parent Code
F03.C
Unspecified dementia, severe

Code Classification

ChapterF01–F99Mental and behavioural disorders
SectionF01-F09Mental disorders due to known physiological conditions
CategoryF03Unspecified dementia
This CodeF03.C4Unspecified dementia, severe, with anxiety

Code EditsBilling

Medicare Code Editor checks that affect claim validity for F03.C4.

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).

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)
      • severe
        • with
          • anxiety

Clinical ClassificationClinical

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

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

Patient EducationClinical

Anxiety

Anxiety is a feeling of fear, dread, and uneasiness. It might cause you to sweat, feel restless and tense, and have a rapid heartbeat. It can be a normal reaction to stress. For example, you might feel anxious when faced with a difficult problem at work, before taking a test, or before making an important decision.

The full article covers:

  • What is anxiety?
  • What are anxiety disorders?
  • What are the types of anxiety disorders?
  • What causes anxiety disorders?
  • Who is at risk for anxiety disorders?
  • What are the symptoms of anxiety disorders?
  • How are anxiety disorders diagnosed?
  • What are the treatments for anxiety disorders?

Read the full article at MedlinePlus

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

Code History & ChangesHistory

Replacement F03.C4 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.C4Overview

Is F03.C4 (Unspecified dementia, severe) a billable code?

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

Who can F03.C4 be reported for?

The Medicare Code Editor checks unspecified dementia, severe, with anxiety 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.