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ICD-10 Guide
ICD-10 CodesM87.365

M87.365

Billable

Other secondary osteonecrosis, left fibula

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

Code Description

ICD-10 M87.365 is a billable code used to indicate a diagnosis of other secondary osteonecrosis, left fibula.

Key Diagnostic Point:

Osteonecrosis, also known as avascular necrosis, is a condition characterized by the death of bone tissue due to a lack of blood supply. In the case of M87.365, the osteonecrosis is secondary, meaning it arises as a complication of another underlying condition or factor, such as corticosteroid use, alcohol abuse, or trauma. The left fibula is specifically affected, which is significant as the fibula plays a crucial role in weight-bearing and stability of the ankle and lower leg. Patients may present with pain, swelling, and limited mobility in the affected area. 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 and physical therapy, or surgical interventions such as core decompression or bone grafting, depending on the severity of the condition. Understanding the etiology and management of secondary osteonecrosis is essential for effective treatment and rehabilitation.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating between primary and secondary osteonecrosis.
  • Identifying the underlying cause of the osteonecrosis.
  • Documenting specific anatomical locations accurately.
  • Understanding the implications of associated conditions.

Audit Risk Factors

  • Inadequate documentation of the underlying cause of osteonecrosis.
  • Failure to specify the affected anatomical site.
  • Misclassification of primary versus secondary osteonecrosis.
  • Lack of supporting imaging or clinical evidence.

Specialty Focus

Medical Specialties

Orthopedics

Documentation Requirements

Detailed clinical notes including history, physical examination findings, imaging results, and treatment plans.

Common Clinical Scenarios

Patients presenting with pain in the lower leg, history of corticosteroid use, or previous trauma.

Billing Considerations

Ensure that the documentation clearly states the relationship between the underlying condition and the osteonecrosis.

Radiology

Documentation Requirements

Comprehensive imaging reports that detail findings consistent with osteonecrosis.

Common Clinical Scenarios

Imaging studies performed for patients with suspected osteonecrosis.

Billing Considerations

Radiologists should correlate imaging findings with clinical history to support accurate coding.

Coding Guidelines

Inclusion Criteria

Use M87.365 When
  • According to ICD
  • 10 coding guidelines, M87
  • 365 should be used when the osteonecrosis is confirmed to be secondary and specifically affects the left fibula
  • Coders must ensure that the underlying cause is documented and that the site is accurately specified

Exclusion Criteria

Do NOT use M87.365 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

20610CPT Code

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

Clinical Scenario

Used when a patient with osteonecrosis requires joint aspiration for diagnostic or therapeutic purposes.

Documentation Requirements

Document the reason for the procedure, findings, and any therapeutic interventions performed.

Specialty Considerations

Orthopedic specialists should ensure that the procedure is justified based on clinical findings.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of osteonecrosis, improving the ability to capture the nuances of secondary causes and specific anatomical sites, which aids in better patient management and resource allocation.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of osteonecrosis, improving the ability to capture the nuances of secondary causes and specific anatomical sites, which aids in better patient management and resource allocation.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of osteonecrosis, improving the ability to capture the nuances of secondary causes and specific anatomical sites, which aids in better patient management and resource allocation.

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 is the difference between primary and secondary osteonecrosis?

Primary osteonecrosis occurs without an identifiable cause, while secondary osteonecrosis is due to underlying conditions such as trauma, corticosteroid use, or other medical issues.