F01.A0 maps to CMS-HCC V28 127. A source-labeled RAF reference is available. Confirm the documented diagnosis and applicable coding requirements. MEAT criteria · RAF Calculator · free HCC coding tools

ICD-10-CM Code View

HCC Buddy Code Card

Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.

Code lookupF01.A0

Effective 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.A0

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

Vascular dementia, mild, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety

Early-stage dementia caused by reduced blood flow to the brain, without behavioral, mood, anxiety, or psychotic symptoms.

Buddy Insight

Mild vascular dementia without behavioral disturbance represents early-stage cerebrovascular-caused cognitive decline where the patient retains significant independence in daily activities.

Overview Risk Models Code Book Documentation Audit Notes Edition comparison

CMS-HCC V28

Mapped

HCC 127

Dementia, Mild or Unspecified

Coefficient HCC 127: 0.341 (Community Non-Dual Aged (CNA))

CMS-HCC V24

Historical

Not used for standard CY2026 Medicare Advantage payment. Select a historical period to review V24.

Not used for CY2026 payment

ACA/HHS

N/A

—

Not risk-adjusted for this model/period.

Not mapped

ESRD/PACE

Context needed

HCC 52

ESRD candidates: HCC 52 when age >= 15. ESRD mapping is separate from PACE. Dialysis, graft, age, and other member context determine the applicable coefficient.

Coefficient needs member context

RXHCC

Context needed

HCC 112

RxHCC candidates: HCC 112 when age >= 15. RxHCC mapping is current. Member segment is still required before using a coefficient.

Coefficient needs member context

Code Book Path

Official

F01Vascular dementia F01.AVascular dementia, mild F01.A0Vascular dementia, mild, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety

Inclusion Terms

Official

Major neurocognitive disorder due to vascular disease, mild, NOS
Vascular dementia, mild, NOS
Vascular dementia as a result of infarction of the brain due to vascular disease, including hypertensive cerebrovascular disease.Inherited from F01

Excludes 2

Official

symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)Inherited from F01-F99

Related Codes

Official

F01.A1Vascular dementia, mild, with behavioral disturbance F01.A2Vascular dementia, mild, with psychotic disturbance F01.A3Vascular dementia, mild, with mood disturbance F01.A4Vascular dementia, mild, with anxiety

Includes

Official

disorders of psychological developmentInherited from F01-F99, F01
arteriosclerotic dementiaInherited from F01-F99, F01
major neurocognitive disorder due to vascular diseaseInherited from F01-F99, F01
multi-infarct dementiaInherited from F01-F99, F01

Excludes 1

Official

mild neurocognitive disorder due to known physiological condition with or without behavioral disturbance (F06.7-)Inherited from F01.A

Code First

Official

, if applicable, any causal conditionInherited from F01

Use Additional

Official

No Use Additional Code instructions are included in this display for F01.A0. Check the code and parent instructions in the Code Book.

Code Also

Official

No Code Also instructions are included in this display for F01.A0. Check the code and parent instructions in the Code Book.

Buddy Documentation Tip

HCC Buddy guidance

Diagnosis of vascular dementia with cerebrovascular etiology

Severity explicitly documented as 'mild' by the treating provider

Cognitive testing supporting mild impairment (MMSE, MoCA scores)

Functional assessment showing mostly preserved activities of daily living

MEAT Support

HCC Buddy guidance

Diagnosis of vascular dementia with cerebrovascular etiology

Severity explicitly documented as 'mild' by the treating provider

Cognitive testing supporting mild impairment (MMSE, MoCA scores)

Functional assessment showing mostly preserved activities of daily living

Audit Caution

HCC Buddy guidance

Using the unspecified severity code (F01.50) when 'mild' is clearly documented

Confusing mild cognitive impairment (G31.84) with mild dementia — they are distinct diagnoses

Not verifying the severity level against cognitive testing — 'mild' should be supported by objective data

Missing the opportunity to code behavioral disturbances that may develop over time

Common Mistakes

HCC Buddy guidance

F01.50 — Vascular dementia, unspecified severity, without behavioral disturbance: use when severity is not specified

F01.B0 — Vascular dementia, moderate, without behavioral disturbance: more advanced stage

G31.84 — Mild cognitive impairment: milder than dementia; not the same diagnosis

F01.A11 — Vascular dementia, mild, with agitation: use when agitation is also present

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.A0 an HCC code?

Yes. F01.A0 (Vascular dementia, mild, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety) maps to HCC 127, Dementia, Mild or Unspecified under the CMS-HCC V28 risk adjustment model, with a source-labeled community non-dual aged reference coefficient of 0.341. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes. It is billable for payment year 2026.

Coder answer: F01.A0 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.A0
Description: Vascular dementia, mild, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety
HCC (V28): HCC 127 — Dementia, Mild or Unspecified
RAF reference coefficient: 0.341
Billable: Yes
Payment year: 2026

HCC Category Mapping

V28HCC 127, Dementia, Mild or Unspecified

0.341

These are source-labeled model coefficients, not member totals. A category may still be removed by hierarchy or model cleanup rules. 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 context, hierarchy and cleanup rules, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains available for historical review.

Work F01.A0 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT review for F01.A0

For F01.A0, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule.

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

Coder workflow notes

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What This Code Means

F01.A0 is the ICD-10-CM diagnosis code for vascular dementia, mild, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety. Early-stage dementia caused by reduced blood flow to the brain, without behavioral, mood, anxiety, or psychotic symptoms. F01.A0 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.A0 maps to Dementia, Mild or Unspecified (HCC 127) with a source-labeled community, non-dual, aged reference coefficient of 0.341. For CY2026 non-PACE Medicare Advantage, CMS uses 100% of the 2024 CMS-HCC model (V28). PACE uses a separate model blend. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes.

Use this code only when vascular dementia is mild and no behavioral or psychiatric complications are present. For F01.A0, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule. 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, source-labeled coefficient references, and MEAT documentation criteria for F01.A0 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Use this code only when vascular dementia is mild and no behavioral or psychiatric complications are present
•Verify documentation confirms absence of agitation, mood changes, anxiety, and psychotic features before assigning this code

Clinical Significance

Mild vascular dementia without behavioral disturbance represents early-stage cerebrovascular-caused cognitive decline where the patient retains significant independence in daily activities. Capturing the mild severity stage is important for tracking disease progression and planning future care needs.

Documentation Requirements

✓Diagnosis of vascular dementia with cerebrovascular etiology
✓Severity explicitly documented as 'mild' by the treating provider
✓Cognitive testing supporting mild impairment (MMSE, MoCA scores)
✓Functional assessment showing mostly preserved activities of daily living
✓Confirmation of absence of behavioral, psychotic, mood, and anxiety disturbances
✓Brain imaging findings consistent with vascular etiology
✓Vascular risk factor management plan

Commonly Confused Codes

•F01.50: Vascular dementia, unspecified severity, without behavioral disturbance: use when severity is not specified
•F01.B0: Vascular dementia, moderate, without behavioral disturbance: more advanced stage
•G31.84: Mild cognitive impairment: milder than dementia; not the same diagnosis
•F01.A11: Vascular dementia, mild, with agitation: use when agitation is also present