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ICD-10 Guide
ICD-10 CodesM66.372

M66.372

Billable

Spontaneous rupture of flexor tendons, left ankle and foot

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

Code Description

ICD-10 M66.372 is a billable code used to indicate a diagnosis of spontaneous rupture of flexor tendons, left ankle and foot.

Key Diagnostic Point:

Spontaneous rupture of flexor tendons in the left ankle and foot is a condition characterized by the unexpected tearing of the flexor tendons, which are responsible for bending the toes and foot. This condition can occur without any apparent trauma or injury, often linked to underlying conditions such as tenosynovitis, which is inflammation of the tendon sheath. Patients may present with sudden pain, swelling, and loss of function in the affected area. The diagnosis is typically confirmed through clinical examination and imaging studies, such as ultrasound or MRI, which can visualize tendon integrity. Treatment may involve conservative management, including rest and immobilization, or surgical intervention to repair the ruptured tendon. Surgical repair aims to restore function and alleviate pain, and rehabilitation is crucial for recovery. Understanding the underlying causes, such as chronic inflammation or degenerative changes, is essential for effective management and prevention of recurrence.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating between spontaneous and traumatic ruptures
  • Identifying associated conditions like tenosynovitis
  • Need for precise documentation of the location and extent of the rupture
  • Variability in treatment approaches (surgical vs. conservative)

Audit Risk Factors

  • Inadequate documentation of the spontaneous nature of the rupture
  • Failure to document associated conditions like tenosynovitis
  • Incorrect coding of the location of the rupture
  • Lack of clarity in surgical repair documentation

Specialty Focus

Medical Specialties

Orthopedic Surgery

Documentation Requirements

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

Common Clinical Scenarios

Patients presenting with acute pain and swelling in the ankle following a sudden onset of symptoms.

Billing Considerations

Ensure clear documentation of the surgical approach and any complications encountered during the procedure.

Physical Medicine and Rehabilitation

Documentation Requirements

Comprehensive evaluations, treatment plans, and progress notes.

Common Clinical Scenarios

Patients undergoing rehabilitation post-surgery for tendon repair.

Billing Considerations

Document functional limitations and progress towards rehabilitation goals.

Coding Guidelines

Inclusion Criteria

Use M66.372 When
  • Follow official ICD
  • 10 coding guidelines, ensuring accurate documentation of the spontaneous rupture and any associated conditions
  • Include details on the location and nature of the injury

Exclusion Criteria

Do NOT use M66.372 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

27301CPT Code

Repair of tendon, flexor, ankle

Clinical Scenario

Used when surgical repair is performed for spontaneous tendon rupture.

Documentation Requirements

Operative report detailing the procedure and findings.

Specialty Considerations

Orthopedic surgeons should ensure all aspects of the surgery are documented.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of spontaneous tendon ruptures, improving data accuracy and enhancing the ability to track treatment outcomes.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of spontaneous tendon ruptures, improving data accuracy and enhancing the ability to track treatment outcomes.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of spontaneous tendon ruptures, improving data accuracy and enhancing the ability to track treatment 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 is the primary cause of spontaneous rupture of flexor tendons?

Spontaneous ruptures are often associated with underlying conditions such as chronic tenosynovitis, degenerative changes, or systemic diseases that weaken tendon integrity.