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 CodesR29.1

R29.1

Meningismus

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/11/2025

Code Description

ICD-10 R29.1 is a billable code used to indicate a diagnosis of meningismus.

Key Diagnostic Point:

Meningismus refers to a clinical syndrome characterized by signs and symptoms that suggest meningeal irritation without the presence of meningitis. Patients may present with neck stiffness, photophobia, and headache, which can mimic the symptoms of meningitis. However, unlike meningitis, meningismus may not be associated with fever or cerebrospinal fluid (CSF) abnormalities. Common causes of meningismus include viral infections, such as enteroviruses, and non-infectious conditions like subarachnoid hemorrhage or irritation from nearby structures. The clinical presentation often requires careful evaluation to rule out true meningitis, necessitating lumbar puncture and CSF analysis in some cases. The diagnosis of meningismus is typically made based on clinical findings and the exclusion of other conditions. It is essential for healthcare providers to document the presence of specific symptoms and any diagnostic tests performed to support the diagnosis accurately.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating between meningismus and true meningitis
  • Need for thorough documentation of symptoms
  • Potential for overlapping symptoms with other neurological conditions
  • Variability in clinical presentation

Audit Risk Factors

  • Inadequate documentation of symptoms leading to misdiagnosis
  • Failure to perform or document necessary diagnostic tests
  • Coding based solely on clinical suspicion without confirmatory evidence
  • Misinterpretation of clinical findings

Specialty Focus

Medical Specialties

Internal Medicine

Documentation Requirements

Detailed documentation of patient history, physical examination findings, and any diagnostic tests performed.

Common Clinical Scenarios

Patients presenting with headache and neck stiffness in an outpatient setting.

Billing Considerations

Consideration of differential diagnoses such as tension headaches or cervical spine issues.

Emergency Medicine

Documentation Requirements

Acute care documentation including vital signs, neurological examination, and any imaging or lab results.

Common Clinical Scenarios

Patients presenting to the emergency department with acute headache and signs of meningeal irritation.

Billing Considerations

Rapid assessment and exclusion of life-threatening conditions like meningitis or subarachnoid hemorrhage.

Coding Guidelines

Inclusion Criteria

Use R29.1 When
  • Follow official ICD
  • CM guidelines for coding symptoms and signs
  • Ensure that the diagnosis is supported by clinical documentation and that any relevant tests are noted

Exclusion Criteria

Do NOT use R29.1 When
No specific exclusions found.

Related CPT Codes

62270CPT Code

Lumbar puncture, diagnostic

Clinical Scenario

When lumbar puncture is performed to rule out meningitis in a patient with suspected meningismus.

Documentation Requirements

Document the indication for the procedure, including clinical findings and any relevant history.

Specialty Considerations

In emergency medicine, rapid documentation is crucial to support the need for 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 symptoms like meningismus, improving the granularity of data collection and analysis.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of symptoms like meningismus, improving the granularity of data collection and analysis.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of symptoms like meningismus, improving the granularity of data collection and analysis.

Resources

Clinical References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Coding & Billing References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Frequently Asked Questions

What is the difference between meningismus and meningitis?

Meningismus refers to signs of meningeal irritation without the presence of infection or inflammation typically seen in meningitis. Meningitis is characterized by fever, altered mental status, and abnormal CSF findings.