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ICD-10 Guide
ICD-10 CodesM66.332

M66.332

Billable

Spontaneous rupture of flexor tendons, left forearm

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

Code Description

ICD-10 M66.332 is a billable code used to indicate a diagnosis of spontaneous rupture of flexor tendons, left forearm.

Key Diagnostic Point:

Spontaneous rupture of flexor tendons in the left forearm is a condition characterized by the unexpected tearing of the flexor tendons, which are responsible for bending the fingers and wrist. This injury can occur without any significant trauma or prior injury, often seen in individuals with underlying conditions such as rheumatoid arthritis or chronic tenosynovitis. The rupture may lead to loss of function in the affected hand, resulting in pain, swelling, and inability to flex the fingers. Diagnosis typically involves a thorough clinical examination and imaging studies, such as ultrasound or MRI, to confirm the rupture and assess the extent of the injury. Treatment may include surgical repair of the tendon, followed by rehabilitation to restore function. The prognosis depends on the severity of the rupture and the timeliness of intervention. Early diagnosis and appropriate management are crucial to optimize recovery and minimize complications.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating between spontaneous and traumatic ruptures
  • Understanding the anatomical location and specific tendon involved
  • Documenting underlying conditions that may contribute to the rupture
  • Navigating the coding guidelines for surgical repairs and associated procedures

Audit Risk Factors

  • Inadequate documentation of the spontaneous nature of the rupture
  • Failure to document associated conditions like tenosynovitis
  • Incorrect linkage of surgical repair codes to the diagnosis
  • Lack of imaging studies to support the diagnosis

Specialty Focus

Medical Specialties

Orthopedic Surgery

Documentation Requirements

Detailed operative notes, imaging results, and pre-operative assessments.

Common Clinical Scenarios

Patients presenting with acute pain and loss of function in the hand, often following a history of chronic tendon issues.

Billing Considerations

Ensure that all surgical interventions are clearly documented, including the type of repair performed and any grafts used.

Physical Medicine and Rehabilitation

Documentation Requirements

Comprehensive evaluation reports, treatment plans, and progress notes.

Common Clinical Scenarios

Rehabilitation following surgical repair of flexor tendons, focusing on restoring range of motion and strength.

Billing Considerations

Document functional limitations and goals for therapy to support the need for rehabilitation services.

Coding Guidelines

Inclusion Criteria

Use M66.332 When
  • According to ICD
  • 10 coding guidelines, M66
  • 332 should be used when the documentation specifies a spontaneous rupture of flexor tendons in the left forearm
  • It is important to ensure that the documentation supports the diagnosis and that any associated conditions are also coded appropriately

Exclusion Criteria

Do NOT use M66.332 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

26301CPT Code

Repair of flexor tendon

Clinical Scenario

Used when a patient undergoes surgical repair of a spontaneously ruptured flexor tendon.

Documentation Requirements

Operative report detailing the procedure, findings, and any complications.

Specialty Considerations

Orthopedic surgeons should ensure that the repair technique and any grafts used 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 the accuracy of data collection and reimbursement processes. M66.332 provides a clear distinction from traumatic ruptures, which is essential for appropriate treatment planning and resource allocation.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of spontaneous tendon ruptures, improving the accuracy of data collection and reimbursement processes. M66.332 provides a clear distinction from traumatic ruptures, which is essential for appropriate treatment planning and resource allocation.

Reimbursement & Billing Impact

reimbursement processes. M66.332 provides a clear distinction from traumatic ruptures, which is essential for appropriate treatment planning 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 are the common causes of spontaneous rupture of flexor tendons?

Common causes include underlying conditions such as rheumatoid arthritis, chronic tenosynovitis, and degenerative tendon changes. These conditions weaken the tendons, making them more susceptible to spontaneous rupture.