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ICD-10 Guide
ICD-10 CodesG56.2

G56.2

Billable

Lesion of ulnar nerve

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

Code Description

ICD-10 G56.2 is a billable code used to indicate a diagnosis of lesion of ulnar nerve.

Key Diagnostic Point:

The ulnar nerve is one of the major nerves of the upper limb, primarily responsible for the sensation and motor function of the hand. A lesion of the ulnar nerve can occur due to various factors, including trauma, compression, or systemic diseases such as diabetes. Clinically, patients may present with symptoms such as numbness, tingling, or weakness in the ring and little fingers, often referred to as 'ulnar nerve palsy.' This condition can arise from entrapment at the elbow (cubital tunnel syndrome) or at the wrist (Guyon's canal syndrome). Diagnosis typically involves a thorough clinical examination, nerve conduction studies (NCS), and electromyography (EMG) to assess the function of the nerve and the extent of the lesion. Treatment options may include conservative management, such as splinting and physical therapy, or surgical intervention in cases of severe compression or persistent symptoms. Accurate coding of ulnar nerve lesions is essential for appropriate reimbursement and to reflect the complexity of the condition in clinical documentation.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in clinical presentation and severity of symptoms
  • Need for comprehensive documentation of nerve conduction studies
  • Differentiation from other neuropathies and nerve lesions
  • Potential for co-existing conditions affecting the ulnar nerve

Audit Risk Factors

  • Inadequate documentation of clinical findings
  • Failure to include nerve conduction study results
  • Misidentification of the specific site of nerve lesion
  • Inconsistent coding of associated conditions

Specialty Focus

Medical Specialties

Neurology

Documentation Requirements

Detailed neurological examination findings, results of NCS/EMG, and treatment plans.

Common Clinical Scenarios

Patients presenting with numbness in the ulnar distribution, weakness in hand grip, or symptoms exacerbated by elbow flexion.

Billing Considerations

Ensure documentation reflects the severity and duration of symptoms, as well as any prior treatments attempted.

Orthopedic Surgery

Documentation Requirements

Surgical notes, pre-operative assessments, and post-operative follow-up documentation.

Common Clinical Scenarios

Patients requiring surgical decompression for ulnar nerve entrapment or repair after trauma.

Billing Considerations

Document the specific surgical procedure performed and any complications encountered.

Coding Guidelines

Inclusion Criteria

Use G56.2 When
  • According to ICD
  • 10 guidelines, G56
  • 2 should be used when there is a confirmed lesion of the ulnar nerve
  • It is important to document the specific site of the lesion and any associated conditions

Exclusion Criteria

Do NOT use G56.2 When
  • Exclusion criteria include lesions due to systemic diseases that are coded separately

Related ICD-10 Codes

Related CPT Codes

95900CPT Code

Nerve conduction studies, upper extremity

Clinical Scenario

Used to evaluate ulnar nerve function in patients with suspected lesions.

Documentation Requirements

Document the specific nerves tested and the results of the study.

Specialty Considerations

Neurologists should ensure that the clinical rationale for the study is clearly documented.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of ulnar nerve lesions, improving the accuracy of clinical data and reimbursement processes. The granularity of ICD-10 codes enables better tracking of nerve-related conditions and their outcomes.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of ulnar nerve lesions, improving the accuracy of clinical data and reimbursement processes. The granularity of ICD-10 codes enables better tracking of nerve-related conditions and their outcomes.

Reimbursement & Billing Impact

reimbursement processes. The granularity of ICD-10 codes enables better tracking of nerve-related conditions and their outcomes.

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 are the common symptoms of ulnar nerve lesions?

Common symptoms include numbness and tingling in the ring and little fingers, weakness in grip strength, and pain in the elbow or wrist area.

How is an ulnar nerve lesion diagnosed?

Diagnosis typically involves a clinical examination, nerve conduction studies, and electromyography to assess nerve function and identify the location of the lesion.