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ICD-10 Guide
ICD-10 CodesM87.366

M87.366

Billable

Other secondary osteonecrosis, unspecified fibula

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

Code Description

ICD-10 M87.366 is a billable code used to indicate a diagnosis of other secondary osteonecrosis, unspecified 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 M87.366, 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 unspecified fibula indicates that the specific site of the osteonecrosis within the fibula is not detailed. This condition can lead to severe pain, limited mobility, and potential fractures if not managed appropriately. The fibula, being a non-weight-bearing bone, may not exhibit symptoms until significant damage has occurred. 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 such as bone grafting or joint replacement in advanced cases. Understanding the etiology and management of secondary osteonecrosis is crucial for effective treatment and rehabilitation.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Requires understanding of secondary causes of osteonecrosis.
  • Differentiation from primary osteonecrosis codes.
  • Need for precise documentation of underlying conditions.
  • Potential for multiple co-morbidities affecting coding.

Audit Risk Factors

  • Inadequate documentation of underlying conditions.
  • Misclassification of osteonecrosis type.
  • Failure to specify the affected site accurately.
  • Inconsistent use of imaging results in documentation.

Specialty Focus

Medical Specialties

Orthopedics

Documentation Requirements

Detailed history of the patient's condition, 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

Orthopedic surgeons must document the specific nature of the osteonecrosis and any surgical interventions performed.

Rheumatology

Documentation Requirements

Comprehensive assessment of systemic conditions contributing to osteonecrosis.

Common Clinical Scenarios

Patients with autoimmune diseases or metabolic disorders leading to secondary osteonecrosis.

Billing Considerations

Rheumatologists should document the relationship between systemic disease and bone health.

Coding Guidelines

Inclusion Criteria

Use M87.366 When
  • According to ICD
  • 10 coding guidelines, M87
  • 366 should be used when osteonecrosis is confirmed and is secondary to another condition
  • Coders must ensure that the underlying cause is documented and that the fibula is the specified site of involvement

Exclusion Criteria

Do NOT use M87.366 When
  • Exclusion criteria include primary osteonecrosis codes and conditions not related to osteonecrosis

Related ICD-10 Codes

Related CPT Codes

20610CPT Code

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

Clinical Scenario

Used for pain management in patients with osteonecrosis.

Documentation Requirements

Document the joint involved and the reason for the procedure.

Specialty Considerations

Orthopedic specialists should note the patient's history of osteonecrosis.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of osteonecrosis, enabling better tracking of secondary causes and improving the accuracy of treatment data. M87.366 provides a clear framework for coders to document cases of secondary osteonecrosis effectively.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of osteonecrosis, enabling better tracking of secondary causes and improving the accuracy of treatment data. M87.366 provides a clear framework for coders to document cases of secondary osteonecrosis effectively.

Reimbursement & Billing Impact

reimbursement and to avoid denials.

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 other conditions or factors, such as trauma or corticosteroid use.