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ICD-10 Guide
ICD-10 CodesM87.066

M87.066

Billable

Idiopathic aseptic necrosis of unspecified fibula

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/17/2025

Code Description

ICD-10 M87.066 is a billable code used to indicate a diagnosis of idiopathic aseptic necrosis of unspecified fibula.

Key Diagnostic Point:

Idiopathic aseptic necrosis of the fibula is a condition characterized by the death of bone tissue due to a lack of blood supply, without any identifiable cause. This condition can lead to significant pain, swelling, and functional impairment of the affected limb. The fibula, being a non-weight-bearing bone, may not exhibit the same level of symptoms as other bones like the femur or tibia, but it can still result in complications such as fractures or deformities. The etiology of idiopathic aseptic necrosis remains unclear, but it is thought to involve factors such as vascular insufficiency, trauma, or systemic diseases. Diagnosis typically involves imaging studies such as MRI or X-rays, which can reveal changes in bone density and structure. Treatment options may include conservative management with pain relief, physical therapy, or surgical interventions in more severe cases. Understanding the nuances of this condition is crucial for accurate coding and appropriate management.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Lack of clear etiology complicates diagnosis.
  • Differentiation from other types of necrosis is necessary.
  • Potential for misclassification with osteomyelitis or other bone conditions.
  • Requires thorough documentation of clinical findings.

Audit Risk Factors

  • Inadequate documentation of symptoms and clinical findings.
  • Failure to provide imaging results supporting the diagnosis.
  • Misuse of codes related to osteomyelitis or other bone infections.
  • Lack of follow-up documentation regarding treatment outcomes.

Specialty Focus

Medical Specialties

Orthopedics

Documentation Requirements

Detailed clinical notes, imaging reports, and treatment plans.

Common Clinical Scenarios

Patients presenting with unexplained leg pain, history of trauma, or previous orthopedic surgeries.

Billing Considerations

Ensure clear differentiation from osteomyelitis and other bone pathologies.

Radiology

Documentation Requirements

Comprehensive imaging reports detailing findings related to necrosis.

Common Clinical Scenarios

Imaging studies requested for patients with suspected bone necrosis.

Billing Considerations

Accurate interpretation of imaging is crucial for supporting the diagnosis.

Coding Guidelines

Inclusion Criteria

Use M87.066 When
  • Follow official ICD
  • 10 coding guidelines, ensuring that the diagnosis is supported by clinical documentation and imaging studies

Exclusion Criteria

Do NOT use M87.066 When
  • Exclude conditions that may mimic or complicate the diagnosis

Related ICD-10 Codes

Related CPT Codes

20610CPT Code

Arthrocentesis, aspiration and/or injection into a major joint or bursa.

Clinical Scenario

Used when joint aspiration is performed due to associated pain.

Documentation Requirements

Document the reason for aspiration and findings.

Specialty Considerations

Orthopedic specialists should ensure accurate linkage to the diagnosis.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of conditions like idiopathic aseptic necrosis, improving the accuracy of patient records and facilitating better treatment planning.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of conditions like idiopathic aseptic necrosis, improving the accuracy of patient records and facilitating better treatment planning.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of conditions like idiopathic aseptic necrosis, improving the accuracy of patient records and facilitating better treatment planning.

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 idiopathic aseptic necrosis of the fibula?

Common symptoms include localized pain, swelling, and potential difficulty in weight-bearing activities. Symptoms may vary based on the severity of the condition.