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ICD-10 Guide
ICD-10 CodesA39.4

A39.4

Meningococcal meningitis, unspecified

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

Code Description

ICD-10 A39.4 is a billable code used to indicate a diagnosis of meningococcal meningitis, unspecified.

Key Diagnostic Point:

Meningococcal meningitis is an acute inflammation of the protective membranes covering the brain and spinal cord, caused by the bacterium Neisseria meningitidis. This condition can lead to severe complications, including neurological damage, septicemia, and death if not treated promptly. The unspecified designation indicates that the specific serogroup of Neisseria meningitidis has not been identified, which can complicate treatment decisions and epidemiological tracking. Symptoms typically include fever, headache, stiff neck, nausea, vomiting, and altered mental status. Diagnosis is confirmed through lumbar puncture and cerebrospinal fluid analysis, which may show elevated white blood cell counts, low glucose levels, and the presence of bacteria. Treatment usually involves intravenous antibiotics, such as penicillin or ceftriaxone, and supportive care. Vaccination against meningococcal disease is a critical preventive measure, especially in high-risk populations.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Unspecified nature of the code can lead to ambiguity in documentation.
  • Differentiating between various types of meningitis can be challenging.
  • Requires understanding of serogroup identification for accurate coding.
  • Potential for co-infection with other pathogens complicates coding.

Audit Risk Factors

  • Inadequate documentation of symptoms and clinical findings.
  • Failure to specify the type of meningitis when applicable.
  • Lack of clear treatment protocols in the medical record.
  • Inconsistent coding practices among different providers.

Specialty Focus

Medical Specialties

Infectious Disease

Documentation Requirements

Detailed clinical notes on symptoms, laboratory findings, and treatment plans.

Common Clinical Scenarios

Patients presenting with fever, headache, and neck stiffness.

Billing Considerations

Ensure that all relevant laboratory results are documented to support the diagnosis.

Neurology

Documentation Requirements

Comprehensive neurological assessments and imaging results.

Common Clinical Scenarios

Patients with neurological deficits or altered mental status due to meningitis.

Billing Considerations

Document any neurological examinations and findings to support the diagnosis.

Coding Guidelines

Inclusion Criteria

Use A39.4 When
  • According to ICD
  • 10 guidelines, A39
  • 4 should be used when the specific serogroup of Neisseria meningitidis is not documented
  • Coders should ensure that the diagnosis is supported by clinical findings and laboratory results

Exclusion Criteria

Do NOT use A39.4 When
  • Exclusion criteria include other types of meningitis or infections that do not involve Neisseria meningitidis

Related CPT Codes

62270CPT Code

Lumbar puncture, diagnostic

Clinical Scenario

Used to obtain cerebrospinal fluid for analysis in suspected meningitis cases.

Documentation Requirements

Document indication for the procedure and findings from CSF analysis.

Specialty Considerations

Ensure that the procedure is linked to the diagnosis of meningitis.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of meningococcal infections, improving data accuracy and epidemiological tracking. However, the unspecified code A39.4 may lead to challenges in understanding the epidemiology of meningococcal disease.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of meningococcal infections, improving data accuracy and epidemiological tracking. However, the unspecified code A39.4 may lead to challenges in understanding the epidemiology of meningococcal disease.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of meningococcal infections, improving data accuracy and epidemiological tracking. However, the unspecified code A39.4 may lead to challenges in understanding the epidemiology of meningococcal disease.

Resources

Clinical References

  • •
    CDC Meningococcal Disease Information

Coding & Billing References

  • •
    CDC Meningococcal Disease Information

Frequently Asked Questions

When should I use A39.4 instead of a more specific code?

Use A39.4 when the serogroup of Neisseria meningitidis is not documented or known. If the serogroup is identified, use the corresponding specific code.