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ICD-10 Guide
ICD-10 CodesM66.239

M66.239

Billable

Spontaneous rupture of extensor tendons, unspecified forearm

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

Code Description

ICD-10 M66.239 is a billable code used to indicate a diagnosis of spontaneous rupture of extensor tendons, unspecified forearm.

Key Diagnostic Point:

Spontaneous rupture of extensor tendons in the forearm is a condition characterized by the unexpected tearing of the extensor tendons, which are responsible for extending the fingers and wrist. This condition can occur without any apparent trauma or injury, often seen in individuals with underlying conditions such as rheumatoid arthritis or chronic tenosynovitis. The rupture may lead to significant functional impairment, including loss of grip strength and difficulty in performing daily activities. Symptoms typically include sudden pain, swelling, and inability to extend the affected fingers. Diagnosis is primarily clinical, supported by imaging studies such as ultrasound or MRI to confirm the rupture and assess the extent of tendon damage. Treatment options may vary from conservative management, including splinting and physical therapy, to surgical intervention for tendon repair or reconstruction, depending on the severity of the rupture and the patient's overall health status.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in clinical presentation and severity of the rupture.
  • Need for precise documentation of the mechanism of injury.
  • Differentiation from other tendon injuries and conditions.
  • Potential for co-existing conditions affecting treatment and coding.

Audit Risk Factors

  • Inadequate documentation of the spontaneous nature of the rupture.
  • Failure to document co-existing conditions that may affect treatment.
  • Misclassification of the injury type (spontaneous vs. traumatic).
  • Lack of imaging studies to support the diagnosis.

Specialty Focus

Medical Specialties

Orthopedic Surgery

Documentation Requirements

Detailed operative reports, imaging studies, and pre-operative assessments.

Common Clinical Scenarios

Patients presenting with sudden wrist pain and inability to extend fingers, often following a history of chronic joint issues.

Billing Considerations

Documentation must clearly indicate the spontaneous nature of the rupture and any relevant surgical interventions.

Rheumatology

Documentation Requirements

Comprehensive patient history, including previous joint issues and current medications.

Common Clinical Scenarios

Patients with autoimmune disorders presenting with tendon ruptures due to underlying inflammation.

Billing Considerations

Consideration of systemic conditions that may predispose patients to tendon ruptures.

Coding Guidelines

Inclusion Criteria

Use M66.239 When
  • According to ICD
  • 10 guidelines, M66
  • 239 should be used when the spontaneous rupture of extensor tendons is confirmed without specification of the exact tendon involved
  • Coders must ensure that the documentation supports the diagnosis and that any related conditions are also coded appropriately

Exclusion Criteria

Do NOT use M66.239 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

26340CPT Code

Repair of extensor tendon

Clinical Scenario

Used when surgical repair is performed following a spontaneous rupture.

Documentation Requirements

Operative report detailing the procedure and findings.

Specialty Considerations

Orthopedic surgeons must document the extent of the rupture and the surgical approach taken.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for greater specificity in coding tendon ruptures, improving the ability to capture the nuances of spontaneous versus traumatic injuries. This specificity aids in better patient management and reimbursement processes.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for greater specificity in coding tendon ruptures, improving the ability to capture the nuances of spontaneous versus traumatic injuries. This specificity aids in better patient management and reimbursement processes.

Reimbursement & Billing Impact

reimbursement processes.

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 primary cause of spontaneous rupture of extensor tendons?

The primary cause is often related to underlying conditions such as rheumatoid arthritis or chronic tenosynovitis, which weaken the tendon structure over time.