2027 ICD-10-CM Diagnosis Code F01.A4Vascular dementia, mild, with anxiety

ICD-10-CM Codes›F01–F99›F01-F09›F01

ICD-10-CM F01.A4
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

F01.A4 is a billable ICD-10-CM diagnosis code for vascular dementia, mild, with anxiety. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 884. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 20 closely related codes. 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.

For Medicare Advantage risk adjustment, F01.A4 maps to CMS-HCC Category 127 (Dementia, Mild or Unspecified) under the V28 model, adding a risk factor of about 0.341 for a community, non-dual, aged beneficiary in payment year 2027.

Code Identity

ICD-10-CM Code
F01.A4
Billable Status
Yes — Valid for Submission
Code Describes
Vascular dementia, mild, with anxiety
Short Description
Vascular dementia, mild, with anxiety
Same as the full description in the CMS dataset.
Parent Code
F01.A
Vascular dementia, mild

Code Classification

ChapterF01–F99Mental and behavioural disorders
SectionF01-F09Mental disorders due to known physiological conditions
CategoryF01Vascular dementia
This CodeF01.A4Vascular dementia, mild, with anxiety

Code EditsBilling

Medicare Code Editor checks that affect claim validity for F01.A4.

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).

Medicare Risk Adjustment (HCC)Billing

F01.A4 maps to a payment category in the CMS-HCC model used to risk-adjust Medicare Advantage payments. Weights are the published community factors for payment year 2027.

CMS-HCC V28 Category (Payment Model)
HCC 127— Dementia, Mild or Unspecified
Payment HCC · PY 2027 one of 65 ICD-10-CM codes in this category
Risk Adjustment Factor (RAF) Weight
+0.341
community, non-dual, aged · ranges 0.000–0.438 across segments
Hierarchy
Superseded by HCC 125 and HCC 126
a more severe related category takes the payment when both are reported
Prior Model (CMS-HCC V24)
HCC 51
V24 retired V28 pays 100% of MA risk scores since PY 2026
Other CMS Models
ESRD (V21): HCC 51 · ESRD (V24): HCC 51
ESRD V21 weights: 0.097 dialysis, 0.000–0.643 functioning graft · ESRD V24 weights: 0.042 dialysis, 0.000–0.399 functioning graft
Part D (RxHCC)
RxHCC 112 — Dementia, Except Alzheimer's Disease
also risk-adjusts in the Part D prescription drug model (V08)

Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to F01.A4: its own notes plus those printed at F01.A, F01, block F01-F09, and Chapter 5. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From F01 Vascular dementia applies to 24 codes
  • arteriosclerotic dementia
  • major neurocognitive disorder due to vascular disease
  • multi-infarct dementia
From Chapter 5 (F01-F99) Mental and behavioural disorders applies to 872 codes
  • disorders of psychological development

Applicable To

Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.

  • Major neurocognitive disorder due to vascular disease, mild, with anxiety

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From F01.A Vascular dementia, mild applies to 6 codes
  • mild neurocognitive disorder due to known physiological condition with or without behavioral disturbance (F06.7-)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 5 (F01-F99) Mental and behavioural disorders applies to 872 codes
  • symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)

Code First

The underlying condition named in the note is sequenced before this code.

From F01 Vascular dementia applies to 24 codes
  • if applicable, any causal condition

Notes

General instructions on how these codes are used.

From Block F01-F09 Mental disorders due to known physiological conditions applies to 91 codes
  • This block comprises a range of mental disorders grouped together on the basis of their having in common a demonstrable etiology in cerebral disease, brain injury, or other insult leading to cerebral dysfunction. The dysfunction may be primary, as in diseases, injuries, and insults that affect the brain directly and selectively; or secondary, as in systemic diseases and disorders that attack the brain only as one of the multiple organs or systems of the body that are involved.

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name F01.A4, its category, or a range that includes it.

Applicable To 1

These notes mention F01.A4.

  • O99.34 Other mental disorders complicating pregnancy, childbirth, and the puerperium
    Conditions in F01-F09, F20-F52 and F54-F99 names F01-F09, which includes this code

Excludes1 2

These codes carry an Excludes1 note naming F01.A4: they are not reported together with it, unless the two conditions are unrelated.

  • F06.7 Mild neurocognitive disorder due to known physiological condition
    dementia (F01.-, F02.-, F03.-) names F01.-, which includes this code
  • G31.84 Mild cognitive impairment of uncertain or unknown etiology
    dementia (F01.-, F02.-, F03.-) names F01.-, which includes this code

Excludes2 4

These codes carry an Excludes2 note naming F01.A4: its condition is not part of those codes, and both may be reported when the patient has both.

  • F02 Dementia in other diseases classified elsewhere
    vascular dementia (F01.5-, F01.A-, F01.B-, F01.C-) names F01.A-, which includes this code
  • F06 Other mental disorders due to known physiological condition
    dementia as classified in F01-F02 names F01-F02, which includes this code
  • F63.1 Pyromania
    mental disorders due to known physiological condition (F01-F09) names F01-F09, which includes this code
  • F63.2 Kleptomania
    stealing in mental disorders due to known physiological condition (F01-F09) names F01-F09, which includes this code

Code Also 1

These codes say F01.A4 may also be needed to fully describe the condition. The note gives no sequencing direction.

  • I67.850 Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy
    vascular dementia (F01.-) names F01.-, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

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

CCSR NVS011
Neurocognitive disorders
Default principal diagnosis: inpatient No · outpatient Yes

Clinical InformationClinical

  • Dementia, Vascular

    an imprecise term referring to dementia associated with cerebrovascular disorders, including cerebral infarction (single or multiple), and conditions associated with chronic brain ischemia. diffuse, cortical, and subcortical subtypes have been described. (from gerontol geriatr 1998 feb;31(1):36-44)

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 F01.A4 replaces the following previously assigned code(s):

  • F01.51 - Vascular dementia with behavioral disturbance
  • F01.51 - Vascular dementia, unsp severity, with behavioral disturb
FY 2023AddedAdded to the ICD-10-CM code setEffective October 1, 2022.
FY 2024–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About F01.A4Overview

What is the ICD-10 code for vascular dementia, mild, with anxiety?

The ICD-10-CM code for vascular dementia, mild, with anxiety is F01.A4 (sometimes written as F01A4). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is F01.A4 (Vascular dementia, mild) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report vascular dementia, mild, with anxiety on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does F01.A4 group to?

When vascular dementia, mild, with anxiety is the principal diagnosis on an inpatient stay, it groups to MS-DRG 884 (organic Disturbances and Intellectual Disability), which carries a relative weight of 1.5998. Higher weights mean higher Medicare reimbursement.

Is F01.A4 a CC or MCC?

CMS lists F01.A4 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 20 closely related codes in its exclusion list.

Who can F01.A4 be reported for?

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

What HCC is F01.A4?

F01.A4 (vascular dementia, mild, with anxiety) maps to CMS-HCC Category 127 (Dementia, Mild or Unspecified), commonly written as HCC 127, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2027. It mapped to HCC 51 under the retired V24 model. It also maps in the ESRD (V21) and ESRD (V24) models. In the Part D prescription drug model it maps to RxHCC 112.

Does F01.A4 risk-adjust for Medicare Advantage payment?

Yes. When documented and reported on a Medicare Advantage encounter, F01.A4 adds a risk adjustment factor of about 0.341 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.000 to 0.438 depending on the payment segment). A more severe related category (HCC 125 and HCC 126) supersedes it when both are reported. See the full factor table on the HCC 127 category page.