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ICD-10 Guide
ICD-10 CodesA22.7

A22.7

Anthrax meningitis

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

Code Description

ICD-10 A22.7 is a billable code used to indicate a diagnosis of anthrax meningitis.

Key Diagnostic Point:

Anthrax meningitis is a severe and rare form of meningitis caused by the bacterium Bacillus anthracis, which is primarily associated with zoonotic infections. This condition arises when anthrax spores enter the central nervous system, often following a systemic infection. The transmission of Bacillus anthracis typically occurs through contact with infected animals or contaminated animal products, such as wool, hides, or meat. Inhalation of spores can also lead to pulmonary anthrax, which may subsequently progress to meningitis. Clinically, patients may present with symptoms such as fever, headache, neck stiffness, altered mental status, and other neurological deficits. Diagnosis is confirmed through cerebrospinal fluid analysis, which may reveal the presence of the bacteria. Given its potential for outbreaks, especially in agricultural settings, public health measures are crucial for monitoring and controlling anthrax exposure. Vaccination of at-risk populations, such as livestock handlers and laboratory workers, is an essential preventive strategy. Prompt recognition and treatment are vital, as anthrax meningitis carries a high mortality rate if not addressed swiftly.

Code Complexity Analysis

Complexity Rating: High

High Complexity

Complexity Factors

  • Requires understanding of zoonotic transmission and public health implications.
  • Differentiation from other forms of meningitis is clinically challenging.
  • Documentation must include specific exposure history and clinical presentation.
  • Potential for co-infection with other pathogens complicates coding.

Audit Risk Factors

  • Inadequate documentation of exposure history.
  • Failure to include laboratory confirmation in medical records.
  • Misclassification of anthrax meningitis as viral or bacterial without proper testing.
  • Lack of detailed clinical presentation in the documentation.

Specialty Focus

Medical Specialties

Infectious Disease

Documentation Requirements

Detailed patient history, exposure risks, laboratory results, and treatment plans.

Common Clinical Scenarios

Patients presenting with fever, neurological symptoms, and a history of exposure to livestock.

Billing Considerations

Ensure thorough documentation of all clinical findings and laboratory results to support the diagnosis.

Neurology

Documentation Requirements

Neurological examination findings, imaging results, and CSF analysis.

Common Clinical Scenarios

Patients with altered mental status and signs of meningitis following exposure to anthrax.

Billing Considerations

Document any differential diagnoses considered and the rationale for the final diagnosis.

Coding Guidelines

Inclusion Criteria

Use A22.7 When
  • Follow the official ICD
  • CM coding guidelines for infectious diseases, ensuring accurate documentation of the clinical presentation and laboratory findings
  • Include any relevant exposure history and co
  • morbid conditions

Exclusion Criteria

Do NOT use A22.7 When
No specific exclusions found.

Related CPT Codes

87070CPT Code

Culture, bacterial, any source

Clinical Scenario

Used when confirming the presence of Bacillus anthracis.

Documentation Requirements

Document the source of the culture and clinical indications for testing.

Specialty Considerations

Infectious disease specialists should ensure all relevant clinical data is included.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of anthrax-related conditions, improving data accuracy and public health tracking. A22.7 provides a distinct code for anthrax meningitis, facilitating better epidemiological studies and resource allocation.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of anthrax-related conditions, improving data accuracy and public health tracking. A22.7 provides a distinct code for anthrax meningitis, facilitating better epidemiological studies and resource allocation.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of anthrax-related conditions, improving data accuracy and public health tracking. A22.7 provides a distinct code for anthrax meningitis, facilitating better epidemiological studies and resource allocation.

Resources

Clinical References

  • •
    CDC Anthrax Information

Coding & Billing References

  • •
    CDC Anthrax Information

Frequently Asked Questions

What are the common symptoms of anthrax meningitis?

Common symptoms include fever, headache, neck stiffness, altered mental status, and neurological deficits. Early recognition is crucial for effective treatment.