ICD-10 Logo
ICDxICD-10 Medical Coding
ICD-10 Logo
ICDxICD-10 Medical Coding
ICD 10 CodesDiagnoses
ICD 10 CodesDiagnoses
ICD-10 Logo
ICDxICD-10 Medical Coding

Comprehensive ICD-10-CM code reference with AI-powered search capabilities.

© 2025 ICD Code Compass. All rights reserved.

Browse

  • All Chapters
  • All Categories
  • Diagnoses

Tools

  • AI Code Search
ICD-10-CM codes are maintained by the CDC and CMS. This tool is for reference purposes only.
v1.0.0
ICD-10 Guide
ICD-10 CodesA87.9

A87.9

Viral meningitis, unspecified

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

Code Description

ICD-10 A87.9 is a billable code used to indicate a diagnosis of viral meningitis, unspecified.

Key Diagnostic Point:

Viral meningitis is an inflammation of the protective membranes covering the brain and spinal cord, primarily caused by viral infections. Unlike bacterial meningitis, viral meningitis is generally less severe and often resolves without specific treatment. Common viral agents include enteroviruses, herpes simplex virus, and mumps virus. Symptoms typically include fever, headache, stiff neck, and sensitivity to light. Diagnosis is usually confirmed through lumbar puncture, which reveals an elevated white blood cell count with a predominance of lymphocytes, normal glucose levels, and negative bacterial cultures. The unspecified designation indicates that the specific viral etiology has not been identified, which can complicate treatment and management strategies. Vaccination status is crucial, as certain vaccines can prevent viral meningitis caused by specific pathogens, such as mumps and varicella. Understanding the patient's vaccination history can guide clinicians in assessing risk factors and potential complications.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Unspecified nature of the code can lead to ambiguity in documentation.
  • Differentiating between viral and bacterial meningitis requires careful clinical assessment.
  • Potential overlap with other CNS infections may complicate coding.
  • Documentation must clearly indicate the absence of bacterial infection.

Audit Risk Factors

  • Inadequate documentation of symptoms and clinical findings.
  • Failure to specify the viral etiology when known.
  • Lack of vaccination history documentation.
  • Misclassification of viral meningitis as bacterial.

Specialty Focus

Medical Specialties

Neurology

Documentation Requirements

Detailed neurological examination findings, lumbar puncture results, and vaccination history.

Common Clinical Scenarios

Patients presenting with fever, headache, and neck stiffness; differential diagnosis with bacterial meningitis.

Billing Considerations

Ensure clear documentation of the absence of bacterial infection and any relevant viral testing.

Infectious Disease

Documentation Requirements

Comprehensive history of exposure, vaccination status, and laboratory results.

Common Clinical Scenarios

Outbreaks of viral meningitis in communities; patients with known viral infections presenting with CNS symptoms.

Billing Considerations

Documenting the specific viral agent when identified is crucial for accurate coding.

Coding Guidelines

Inclusion Criteria

Use A87.9 When
  • According to ICD
  • 10 coding guidelines, A87
  • 9 should be used when the specific viral cause of meningitis is not documented
  • Coders should ensure that documentation supports the diagnosis of viral meningitis and that bacterial meningitis has been ruled out

Exclusion Criteria

Do NOT use A87.9 When
No specific exclusions found.

Related CPT Codes

62270CPT Code

Lumbar puncture, diagnostic

Clinical Scenario

Used to obtain CSF for analysis in suspected cases of meningitis.

Documentation Requirements

Document indication for lumbar puncture, findings, and results.

Specialty Considerations

Neurologists and infectious disease specialists should ensure thorough documentation of the procedure.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of viral meningitis, improving data accuracy and enabling better tracking of viral infections. A87.9 serves as a catch-all for unspecified cases, but coders must ensure that documentation supports its use.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of viral meningitis, improving data accuracy and enabling better tracking of viral infections. A87.9 serves as a catch-all for unspecified cases, but coders must ensure that documentation supports its use.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of viral meningitis, improving data accuracy and enabling better tracking of viral infections. A87.9 serves as a catch-all for unspecified cases, but coders must ensure that documentation supports its use.

Resources

Clinical References

  • •
    CDC Viral Meningitis Information

Coding & Billing References

  • •
    CDC Viral Meningitis Information

Frequently Asked Questions

What should I document to support the use of A87.9?

Document clinical symptoms, results of lumbar puncture, and any relevant history, including vaccination status and exposure to known viral infections.