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ICD-10 Guide
ICD-10 CodesG58.9

G58.9

Billable

Mononeuropathy, unspecified

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

Code Description

ICD-10 G58.9 is a billable code used to indicate a diagnosis of mononeuropathy, unspecified.

Key Diagnostic Point:

Mononeuropathy refers to a condition where a single nerve is damaged or dysfunctional, leading to sensory, motor, or autonomic symptoms. The unspecified designation indicates that the specific nerve affected is not identified. This condition can arise from various etiologies, including trauma, compression, systemic diseases, or idiopathic causes. Common presentations may include weakness, numbness, tingling, or pain in the distribution of the affected nerve. In cases of cranial nerve involvement, symptoms may manifest as visual disturbances, facial weakness, or altered sensation. Nerve entrapments, such as carpal tunnel syndrome or ulnar nerve entrapment, are common forms of mononeuropathy, often resulting from repetitive strain or anatomical anomalies. Diagnosis typically involves clinical evaluation, nerve conduction studies, and electromyography to assess the function of the affected nerve. Treatment may include conservative measures such as physical therapy, splinting, or corticosteroid injections, and in some cases, surgical intervention may be necessary to relieve compression. Accurate coding is essential for appropriate reimbursement and to reflect the complexity of the patient's condition.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in clinical presentation and symptoms
  • Need for precise documentation of affected nerve
  • Differentiation from other neuropathies and conditions
  • Potential for multiple underlying causes

Audit Risk Factors

  • Insufficient documentation of symptoms and clinical findings
  • Failure to specify the affected nerve when known
  • Inadequate justification for the use of unspecified code
  • Lack of supporting diagnostic tests such as nerve conduction studies

Specialty Focus

Medical Specialties

Neurology

Documentation Requirements

Detailed neurological examination findings, results of nerve conduction studies, and any imaging studies performed.

Common Clinical Scenarios

Patients presenting with unilateral weakness, sensory loss, or pain in a specific nerve distribution.

Billing Considerations

Ensure clear documentation of the affected nerve and any relevant comorbid conditions.

Orthopedics

Documentation Requirements

Surgical notes, pre-operative assessments, and post-operative follow-ups if surgical intervention is performed.

Common Clinical Scenarios

Patients with nerve entrapment syndromes requiring surgical release.

Billing Considerations

Document the rationale for surgical intervention and any pre-existing conditions contributing to nerve damage.

Coding Guidelines

Inclusion Criteria

Use G58.9 When
  • Follow the official ICD
  • CM coding guidelines, ensuring that the code is used when the specific nerve affected is not documented
  • Use additional codes to specify any underlying conditions contributing to the neuropathy

Exclusion Criteria

Do NOT use G58.9 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

95903CPT Code

Nerve conduction study, each nerve

Clinical Scenario

Used to confirm the diagnosis of mononeuropathy.

Documentation Requirements

Results of the nerve conduction study must be documented in the patient's medical record.

Specialty Considerations

Neurologists should ensure that the study is performed according to established protocols.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of neuropathies, but the unspecified codes like G58.9 still pose challenges in terms of documentation and justification for use.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of neuropathies, but the unspecified codes like G58.9 still pose challenges in terms of documentation and justification for use.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of neuropathies, but the unspecified codes like G58.9 still pose challenges in terms of documentation and justification for use.

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 G58.9?

Use G58.9 when a patient presents with symptoms of mononeuropathy, but the specific nerve affected is not documented in the medical record.