What is ICD-10 code F01.A2?

F01.A2 is the ICD-10-CM diagnosis code for Vascular dementia, mild, with psychotic disturbance. Early-stage dementia caused by reduced blood flow to the brain with hallucinations, delusions, or other psychotic symptoms. It belongs to the ICD-10-CM chapter for mental, behavioral and neurodevelopmental disorders (f01-f99). F01.A2 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. F01.A2 is part of the FY2026 ICD-10-CM code set published by the CMS National Center for Health Statistics and used on Medicare, Medicaid, and commercial claims in the United States.

Yes. F01.A2 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. F01.A2 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

What is the V28 vs V24 difference for F01.A2?

CMS phased in the V28 risk adjustment model over payment years 2024 (33%), 2025 (67%), and 2026 (100%), replacing V24. V28 consolidates HCC categories, removes some lower-acuity conditions, and recalibrates RAF weights across the entire model. For F01.A2, V28 maps to Dementia, Mild or Unspecified at RAF 0.341 while V24 mapped to Dementia With Complications at RAF 0.346. Both models can still appear in legacy data and in payer-specific lookback periods.

What should coders know when reporting F01.A2?

Document specific psychotic features such as hallucinations or delusions to justify this code selection Distinguish between psychotic disturbance and other behavioral or mood disturbances for accurate coding Because F01.A2 maps to a payment HCC, the documentation must also satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's risk adjustment score.

2026 ICD-10-CM F01.A2: Vascular dementia, mild

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Code lookupF01.A2Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Mental, Behavioral and Neurodevelopmental disorders (F01-F99) / Mental disorders due to known physiological conditions (F01-F09)

F01.A2

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Vascular dementia, mild, with psychotic disturbance

Early-stage dementia caused by reduced blood flow to the brain with hallucinations, delusions, or other psychotic symptoms.

Buddy Insight

Mild vascular dementia with psychotic disturbance is an uncommon but clinically significant presentation where early-stage vascular cognitive decline includes hallucinations, delusions, or paranoia.

CMS-HCC V28

Mapped

HCC 127

Dementia, Mild or Unspecified

RAF 0.341

CMS-HCC V24

Mapped

HCC 51

Dementia With Complications

RAF 0.346

ACA/HHS

N/A

—

Not risk-adjusted for this model/period.

Not mapped

ESRD/PACE

Mapped

HCC 51

Dementia With Complications

RAF 0.042

RXHCC

Mapped

HCC 112

Dementia and Other Specified ...

Not separately weighted

Code Book Path

Official

F01Vascular dementia

F01.AVascular dementia, mild

F01.A2Vascular dementia, mild, with psychotic disturbance

Inclusion Terms

Official

Major neurocognitive disorder due to vascular disease, mild, with psychotic disturbance such as hallucinations, paranoia, suspiciousness, or delusional state
Vascular dementia, mild, with psychotic disturbance such as hallucinations, paranoia, suspiciousness, or delusional state

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for F01.A2 in this effective period.

Related Child Codes

Official

F01.A0Vascular dementia, mild, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety

F01.A1Vascular dementia, mild, with behavioral disturbance

F01.A3Vascular dementia, mild, with mood disturbance

F01.A4Vascular dementia, mild, with anxiety

Includes

Official

ICD-10-CM does not list Includes notes for F01.A2 in this effective period.

Excludes 1

Official

mild neurocognitive disorder due to known physiological condition with or without behavioral disturbance (F06.7-)

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for F01.A2 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for F01.A2 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for F01.A2 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Diagnosis of vascular dementia with cerebrovascular etiology

Severity explicitly documented as 'mild'

Specific psychotic symptoms documented (visual/auditory hallucinations, delusions, paranoia)

Cognitive assessment supporting mild stage

MEAT Support

HCC Buddy guidance

Diagnosis of vascular dementia with cerebrovascular etiology

Severity explicitly documented as 'mild'

Specific psychotic symptoms documented (visual/auditory hallucinations, delusions, paranoia)

Cognitive assessment supporting mild stage

Audit Caution

HCC Buddy guidance

Confusing psychotic disturbance with behavioral disturbance — hallucinations/delusions are psychotic, not behavioral

Using a standalone psychosis code instead of the combined dementia-with-psychosis code

Defaulting to unspecified severity when mild is clearly documented

Not documenting the specific psychotic symptoms — vague terms like 'confusion' do not support psychosis coding

Common Mistakes

HCC Buddy guidance

F01.A0 — Vascular dementia, mild, without behavioral disturbance: use when no psychotic features

F01.52 — Vascular dementia, unspecified severity, with psychotic disturbance: use when severity unspecified

F01.A3 — Vascular dementia, mild, with mood disturbance: mood vs. psychotic symptoms

F06.2 — Psychotic disorder with delusions due to known physiological condition: not for dementia-related psychosis

Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →

Is F01.A2 an HCC code?

Yes. F01.A2 (Vascular dementia, mild, with psychotic disturbance) maps to Dementia, Mild or Unspecified under the CMS-HCC V28 risk adjustment model (and Dementia With Complications under V24), with a community non-dual aged RAF of 0.341. It is billable for payment year 2026.

Coder answer: F01.A2 is billable and maps to V28 HCC 127, Dementia, Mild or Unspecified. Open it in the Code Book for the tabular path, RAF, and MEAT checklist.

Code: F01.A2
Description: Vascular dementia, mild, with psychotic disturbance
HCC (V28): HCC 127 — Dementia, Mild or Unspecified
RAF: 0.341
Billable: Yes
Payment year: 2026

HCC Category Mapping

V28HCC 127, Dementia, Mild or Unspecified

0.341

V24HCC 51, Dementia With Complications

0.346

ESRDHCC 51, Dementia With Complications

0.042

RxHCCHCC 112, Dementia and Other Specified Brain Disorders

Not separately weighted

Each model's RAF is its CMS base weight for that model's standard population, so weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.

Work F01.A2 in the Code Book — tabular path, V28 RAF, and MEAT checklist →

MEAT Criteria for F01.A2

For F01.A2 to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically, it has to be re-documented and supported each calendar year.

MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
EEvaluate: test results, medication response, or physical findings reviewed by the provider
AAssess: explicit mention in the assessment or plan with acknowledgment of status
TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis

Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed F01.A2 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

F01.A2 is the ICD-10-CM diagnosis code for vascular dementia, mild, with psychotic disturbance. Early-stage dementia caused by reduced blood flow to the brain with hallucinations, delusions, or other psychotic symptoms. F01.A2 sits in the ICD-10-CM chapter for mental, behavioral and neurodevelopmental disorders (f01-f99), within the section covering mental disorders due to known physiological conditions (f01-f09).

Under the CMS-HCC V28 risk adjustment model, F01.A2 maps to Dementia, Mild or Unspecified (HCC 127) with a community, non-dual, aged base RAF weight of 0.341. Under the older CMS-HCC V24 model, F01.A2 maps to Dementia With Complications (HCC 51) with a community, non-dual, aged base RAF weight of 0.346. V28 is the CMS-HCC risk adjustment model that reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition.

Document specific psychotic features such as hallucinations or delusions to justify this code selection. Because F01.A2 maps to a payment HCC, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's Medicare Advantage risk adjustment score. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.

HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for F01.A2 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Document specific psychotic features such as hallucinations or delusions to justify this code selection
•Distinguish between psychotic disturbance and other behavioral or mood disturbances for accurate coding

Clinical Significance

Mild vascular dementia with psychotic disturbance is an uncommon but clinically significant presentation where early-stage vascular cognitive decline includes hallucinations, delusions, or paranoia. Psychotic features in mild dementia require careful pharmacologic management and often accelerate the need for supervised care.

Documentation Requirements

✓Diagnosis of vascular dementia with cerebrovascular etiology
✓Severity explicitly documented as 'mild'
✓Specific psychotic symptoms documented (visual/auditory hallucinations, delusions, paranoia)
✓Cognitive assessment supporting mild stage
✓Risk-benefit discussion for antipsychotic use documented (FDA black box warning)
✓Safety assessment and monitoring plan

Commonly Confused Codes

•F01.A0: Vascular dementia, mild, without behavioral disturbance: use when no psychotic features
•F01.52: Vascular dementia, unspecified severity, with psychotic disturbance: use when severity unspecified
•F01.A3: Vascular dementia, mild, with mood disturbance: mood vs. psychotic symptoms
•F06.2: Psychotic disorder with delusions due to known physiological condition: not for dementia-related psychosis