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v1.0.0
ICD-10 Guide
ICD-10 CodesG31.86

G31.86

Billable

Alexander disease

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

Code Description

ICD-10 G31.86 is a billable code used to indicate a diagnosis of alexander disease.

Key Diagnostic Point:

Alexander disease is a rare, progressive neurological disorder characterized by the accumulation of abnormal protein (GFAP) in the brain, leading to the degeneration of white matter. It primarily affects infants and young children, although adult-onset forms exist. Symptoms may include developmental delays, seizures, cognitive decline, and motor dysfunction. The disease is classified as a leukodystrophy, which means it affects the myelin sheath that insulates nerve fibers. Diagnosis is typically made through clinical evaluation, MRI findings, and genetic testing for mutations in the GFAP gene. The condition is progressive, and management focuses on symptomatic relief and supportive care, as there is currently no cure. Cognitive decline in patients with Alexander disease can resemble that seen in other degenerative diseases, such as Alzheimer's disease, making differential diagnosis crucial. Understanding the nuances of Alexander disease is essential for accurate coding and appropriate patient management.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Rarity of the condition leading to limited familiarity among coders.
  • Overlap of symptoms with other neurodegenerative diseases.
  • Need for precise documentation of clinical findings and genetic testing.
  • Potential for misdiagnosis with similar conditions like Alzheimer's disease.

Audit Risk Factors

  • Inadequate documentation of clinical symptoms.
  • Failure to include genetic testing results.
  • Misclassification of the disease as a more common condition.
  • Lack of detailed treatment plans in medical records.

Specialty Focus

Medical Specialties

Neurology

Documentation Requirements

Comprehensive neurological assessments, MRI results, and genetic testing documentation.

Common Clinical Scenarios

Diagnosis of Alexander disease in pediatric patients presenting with developmental delays and seizures.

Billing Considerations

Ensure all neurological evaluations are documented to support the diagnosis.

Genetics

Documentation Requirements

Genetic testing results and family history documentation.

Common Clinical Scenarios

Counseling families with a history of Alexander disease and discussing genetic testing options.

Billing Considerations

Document the rationale for genetic testing and results to support coding.

Coding Guidelines

Inclusion Criteria

Use G31.86 When
  • Follow official ICD
  • 10 coding guidelines, ensuring accurate documentation of symptoms and diagnostic tests
  • Include any relevant family history and genetic testing results to support the diagnosis

Exclusion Criteria

Do NOT use G31.86 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

96116CPT Code

Neuropsychological testing

Clinical Scenario

Used to assess cognitive function in patients with suspected Alexander disease.

Documentation Requirements

Detailed report of cognitive assessments and findings.

Specialty Considerations

Neurologists should ensure comprehensive documentation of cognitive decline.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of rare diseases like Alexander disease, improving the accuracy of data collection and reimbursement processes.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of rare diseases like Alexander disease, improving the accuracy of data collection and reimbursement processes.

Reimbursement & Billing Impact

reimbursement processes.

Resources

Clinical References

  • •
    Alexander Disease Foundation

Coding & Billing References

  • •
    Alexander Disease Foundation

Frequently Asked Questions

What are the common symptoms of Alexander disease?

Common symptoms include developmental delays, seizures, cognitive decline, and motor dysfunction, which can vary based on the age of onset.