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v1.0.0
ICD-10 Guide
ICD-10 CodesR94.0

R94.0

Abnormal results of function studies of central nervous system

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

Code Description

ICD-10 R94.0 is a billable code used to indicate a diagnosis of abnormal results of function studies of central nervous system.

Key Diagnostic Point:

R94.0 is used to classify abnormal results from function studies of the central nervous system (CNS), which may include various diagnostic tests such as electroencephalograms (EEGs), evoked potentials, and other neurophysiological assessments. These tests are designed to evaluate the electrical activity of the brain and the functional integrity of the CNS. Abnormal findings may indicate a range of neurological disorders, including epilepsy, multiple sclerosis, or other conditions affecting brain function. Symptoms associated with abnormal CNS function may include seizures, altered consciousness, cognitive deficits, or motor dysfunction. It is crucial for healthcare providers to document the specific tests performed, the results, and the clinical context to ensure accurate coding and appropriate patient management.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variety of tests that can yield abnormal results
  • Need for precise documentation of test results
  • Differentiation from other neurological codes
  • Potential overlap with other diagnoses

Audit Risk Factors

  • Inadequate documentation of test results
  • Failure to specify the type of function study performed
  • Misinterpretation of abnormal findings
  • Lack of correlation between symptoms and test results

Specialty Focus

Medical Specialties

Internal Medicine

Documentation Requirements

Detailed documentation of patient history, symptoms, and specific tests performed is essential. Include results and interpretations.

Common Clinical Scenarios

Patients presenting with unexplained neurological symptoms such as headaches, dizziness, or cognitive changes.

Billing Considerations

Ensure that the clinical rationale for testing is clearly documented to support the use of R94.0.

Emergency Medicine

Documentation Requirements

Acute care documentation must include immediate findings from function studies and any interventions performed.

Common Clinical Scenarios

Patients with acute neurological events such as seizures or altered mental status requiring rapid assessment.

Billing Considerations

Document the urgency of the situation and any immediate treatments provided to justify the use of R94.0.

Coding Guidelines

Inclusion Criteria

Use R94.0 When
  • Follow official ICD
  • 10 coding guidelines, ensuring that the code is used only when there are abnormal results from function studies of the CNS and that these results are documented in the patient's medical record

Exclusion Criteria

Do NOT use R94.0 When
No specific exclusions found.

Related CPT Codes

95816CPT Code

Electroencephalogram (EEG)

Clinical Scenario

When an EEG is performed due to suspected seizure activity.

Documentation Requirements

Document the indication for the EEG and the results.

Specialty Considerations

Neurology specialists should ensure comprehensive reporting of EEG findings.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of abnormal CNS function studies, improving the granularity of data for research and clinical management.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of abnormal CNS function studies, improving the granularity of data for research and clinical management.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of abnormal CNS function studies, improving the granularity of data for research and clinical management.

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

When should I use R94.0?

Use R94.0 when there are abnormal results from function studies of the CNS, and ensure that these results are documented in the patient's medical record.