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v1.0.0
ICD-10 Guide
ICD-10 CodesR83.5

R83.5

Abnormal microbiological findings in cerebrospinal fluid

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

Code Description

ICD-10 R83.5 is a billable code used to indicate a diagnosis of abnormal microbiological findings in cerebrospinal fluid.

Key Diagnostic Point:

R83.5 is used to classify abnormal microbiological findings in cerebrospinal fluid (CSF) that are not classified elsewhere. This code encompasses a range of findings that may indicate infections, inflammatory conditions, or other pathological processes affecting the central nervous system. Common abnormalities include the presence of bacteria, viruses, fungi, or atypical cells in the CSF, which can be detected through laboratory analysis. Symptoms associated with abnormal CSF findings may include fever, headache, neck stiffness, altered mental status, and neurological deficits. The clinical context often involves conditions such as meningitis, encephalitis, or multiple sclerosis, where timely diagnosis and treatment are critical. Accurate coding requires thorough documentation of the clinical findings, laboratory results, and any relevant symptoms to ensure appropriate management and reimbursement.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variety of potential underlying conditions leading to abnormal findings
  • Need for precise documentation of laboratory results
  • Differentiation from other neurological conditions
  • Potential overlap with other ICD-10 codes

Audit Risk Factors

  • Inadequate documentation of laboratory findings
  • Failure to specify the type of abnormality detected
  • Misclassification of symptoms related to CSF findings
  • Inconsistent coding practices across providers

Specialty Focus

Medical Specialties

Internal Medicine

Documentation Requirements

Detailed documentation of symptoms, laboratory results, and clinical rationale for CSF analysis.

Common Clinical Scenarios

Patients presenting with fever, headache, and neurological symptoms requiring CSF analysis.

Billing Considerations

Ensure that all relevant clinical findings are documented to support the diagnosis and coding.

Emergency Medicine

Documentation Requirements

Acute care documentation must include time-sensitive symptoms and immediate lab results.

Common Clinical Scenarios

Patients with acute onset of severe headache and altered mental status requiring rapid CSF analysis.

Billing Considerations

Document the urgency of the situation and any immediate interventions performed.

Coding Guidelines

Inclusion Criteria

Use R83.5 When
  • Follow the official ICD
  • CM coding guidelines, ensuring that the code is used only when there is clear documentation of abnormal microbiological findings in CSF
  • The code should not be used if the findings are classified under other specific conditions

Exclusion Criteria

Do NOT use R83.5 When
No specific exclusions found.

Related CPT Codes

62270CPT Code

Lumbar puncture

Clinical Scenario

Used to obtain CSF for analysis when abnormal findings are suspected.

Documentation Requirements

Document the indication for the procedure and the findings from the CSF analysis.

Specialty Considerations

In neurology, ensure that the rationale for lumbar puncture is clearly stated.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of abnormal findings in CSF, improving the granularity of data for epidemiological studies and clinical research.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of abnormal findings in CSF, improving the granularity of data for epidemiological studies and clinical research.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of abnormal findings in CSF, improving the granularity of data for epidemiological studies and clinical research.

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 should be documented to support the use of R83.5?

Documentation should include the clinical symptoms leading to CSF analysis, the results of the laboratory tests, and any relevant medical history that supports the diagnosis of abnormal findings.