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ICD-10 Guide
ICD-10 CodesI63.521

I63.521

Billable

Cerebral infarction due to unspecified occlusion or stenosis of right anterior cerebral artery

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/06/2025

Code Description

ICD-10 I63.521 is a billable code used to indicate a diagnosis of cerebral infarction due to unspecified occlusion or stenosis of right anterior cerebral artery.

Key Diagnostic Point:

Cerebral infarction due to unspecified occlusion or stenosis of the right anterior cerebral artery refers to an area of ischemia in the brain resulting from a blockage or narrowing of the right anterior cerebral artery (ACA). The ACA supplies blood to the medial portions of the frontal lobes and the superior medial parietal lobes. Clinical presentation may include sudden onset of weakness or paralysis on the opposite side of the body, sensory loss, speech difficulties, and cognitive impairments. The disease progression can vary, with some patients experiencing transient ischemic attacks (TIAs) prior to a full-blown stroke. Diagnostic considerations include neuroimaging techniques such as CT or MRI scans to identify the infarction and assess the extent of brain damage. Additionally, vascular imaging may be necessary to evaluate the occlusion or stenosis of the artery. Early intervention is crucial to minimize neurological deficits and improve outcomes.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Diagnostic complexity: Requires imaging and clinical evaluation to confirm diagnosis.
  • Treatment complexity: Management may involve anticoagulation, rehabilitation, and monitoring.
  • Documentation requirements: Detailed clinical notes and imaging results are essential.
  • Coding specificity: Requires precise identification of the affected artery and cause.

Audit Risk Factors

  • Common coding errors: Misidentification of the artery or cause of infarction.
  • Documentation gaps: Incomplete clinical notes or lack of imaging results.
  • Billing challenges: Potential for denials if documentation does not support the diagnosis.

Specialty Focus

Medical Specialties

Neurology

Documentation Requirements

Standard ICD-10-CM documentation requirements apply

Common Clinical Scenarios

Various clinical presentations within this specialty area

Billing Considerations

Follow specialty-specific billing guidelines

Emergency Medicine

Documentation Requirements

Standard ICD-10-CM documentation requirements apply

Common Clinical Scenarios

Various clinical presentations within this specialty area

Billing Considerations

Follow specialty-specific billing guidelines

Related ICD-10 Codes

Related CPT Codes

CPT Code

Clinical Scenario

Documentation Requirements

CPT Code

Clinical Scenario

Documentation Requirements

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

Cerebral infarctions significantly impact population health, contributing to morbidity and mortality rates associated with stroke. Quality measures focus on timely diagnosis and intervention, which can improve patient outcomes and reduce long-term disability. Understanding the epidemiology of strokes, including risk factors such as hypertension and diabetes, is crucial for healthcare providers to implement preventive measures and optimize resource allocation.

ICD-9 vs ICD-10

Cerebral infarctions significantly impact population health, contributing to morbidity and mortality rates associated with stroke. Quality measures focus on timely diagnosis and intervention, which can improve patient outcomes and reduce long-term disability. Understanding the epidemiology of strokes, including risk factors such as hypertension and diabetes, is crucial for healthcare providers to implement preventive measures and optimize resource allocation.

Reimbursement & Billing Impact

Reimbursement considerations include the need for thorough clinical notes, imaging results, and treatment plans. Common denials may arise from insufficient documentation or failure to demonstrate medical necessity. Best practices include ensuring that all clinical findings are clearly documented and that the coding accurately reflects the diagnosis and treatment provided.

Resources

Clinical References

  • •
    ICD-10 Official Guidelines for I00-I99
  • •
    Clinical Documentation Requirements

Coding & Billing References

  • •
    ICD-10 Official Guidelines for I00-I99
  • •
    Clinical Documentation Requirements

Frequently Asked Questions

What specific conditions are covered by I63.521?

I63.521 covers cerebral infarctions resulting from unspecified occlusion or stenosis of the right anterior cerebral artery, which may include ischemic strokes and transient ischemic attacks (TIAs) related to this artery.

When should I63.521 be used instead of related codes?

I63.521 should be used when the occlusion or stenosis of the right anterior cerebral artery is confirmed but not specified. If the occlusion is documented as due to a specific cause (e.g., embolism), a more specific code should be selected.

What documentation supports I63.521?

Documentation should include clinical findings, imaging results (CT/MRI), and any relevant history of vascular disease. Clear notes on the patient's symptoms and the clinical rationale for the diagnosis are also necessary.