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v1.0.0
ICD-10 Guide
ICD-10 CodesG46.1

G46.1

Billable

Anterior cerebral artery syndrome

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/05/2025

Code Description

ICD-10 G46.1 is a billable code used to indicate a diagnosis of anterior cerebral artery syndrome.

Key Diagnostic Point:

Anterior cerebral artery syndrome (ACAS) is a neurological condition resulting from ischemia or infarction in the territories supplied by the anterior cerebral artery (ACA). This syndrome is characterized by a range of symptoms, including contralateral hemiparesis, particularly affecting the leg more than the arm, and sensory loss. Patients may also exhibit behavioral changes, such as apathy or personality alterations, due to the involvement of the frontal lobe. Transient ischemic attacks (TIAs) may precede a full-blown stroke, serving as warning signs of potential cerebrovascular events. The ACA supplies blood to the medial portions of the frontal lobes and superior medial parietal lobes, making its occlusion particularly impactful on motor and cognitive functions. Stroke prevention strategies for patients at risk include lifestyle modifications, management of hypertension, diabetes, and hyperlipidemia, and the use of antiplatelet agents. Understanding the clinical presentation and risk factors associated with ACAS is crucial for timely diagnosis and intervention.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating between transient ischemic attacks and full strokes
  • Understanding the specific neurological deficits associated with ACA involvement
  • Identifying risk factors for cerebrovascular disease
  • Documenting the clinical presentation accurately

Audit Risk Factors

  • Inadequate documentation of neurological deficits
  • Failure to specify if the event was a TIA or stroke
  • Misclassification of the syndrome due to overlapping symptoms
  • Lack of documentation regarding risk factors and preventive measures

Specialty Focus

Medical Specialties

Neurology

Documentation Requirements

Detailed neurological examination findings, including motor and sensory assessments, and cognitive evaluations.

Common Clinical Scenarios

Patients presenting with unilateral weakness, sensory loss, or cognitive changes following a TIA or stroke.

Billing Considerations

Ensure clear documentation of the onset, duration, and resolution of symptoms to differentiate between TIA and stroke.

Emergency Medicine

Documentation Requirements

Accurate recording of patient history, symptom onset, and initial neurological assessments.

Common Clinical Scenarios

Patients arriving with acute onset of neurological deficits, requiring rapid assessment and intervention.

Billing Considerations

Timely documentation is critical for stroke protocols and potential thrombolytic therapy eligibility.

Coding Guidelines

Inclusion Criteria

Use G46.1 When
  • According to ICD
  • 10 guidelines, G46
  • 1 should be used when the clinical documentation supports a diagnosis of anterior cerebral artery syndrome
  • It is important to note the distinction between acute and chronic conditions, as well as the presence of any associated risk factors

Exclusion Criteria

Do NOT use G46.1 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

99214CPT Code

Established patient office visit, level 4

Clinical Scenario

Used for follow-up visits for patients with ACAS to monitor recovery and manage risk factors.

Documentation Requirements

Document the patient's history, examination findings, and any changes in treatment plans.

Specialty Considerations

Neurologists should ensure comprehensive documentation of neurological assessments.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of cerebrovascular conditions, including anterior cerebral artery syndrome, which enhances the ability to track and manage these conditions effectively.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of cerebrovascular conditions, including anterior cerebral artery syndrome, which enhances the ability to track and manage these conditions effectively.

Reimbursement & Billing Impact

reimbursement and quality reporting.

Resources

Clinical References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Coding & Billing References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Frequently Asked Questions

What are the primary symptoms of anterior cerebral artery syndrome?

The primary symptoms include contralateral leg weakness, sensory loss, and potential cognitive changes due to frontal lobe involvement.

How can anterior cerebral artery syndrome be differentiated from other cerebrovascular syndromes?

ACAS typically presents with more pronounced leg weakness compared to arm weakness, and cognitive changes may be more evident due to frontal lobe involvement.