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ICD-10 Guide
ICD-10 CodesM66.312

M66.312

Billable

Spontaneous rupture of flexor tendons, left shoulder

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

Code Description

ICD-10 M66.312 is a billable code used to indicate a diagnosis of spontaneous rupture of flexor tendons, left shoulder.

Key Diagnostic Point:

Spontaneous rupture of flexor tendons in the left shoulder is a condition characterized by the unexpected tearing of the flexor tendons, which are responsible for the movement of the shoulder joint. This condition can occur without any prior trauma or injury, often associated with underlying degenerative changes or inflammatory conditions such as tenosynovitis. Patients may present with sudden pain, swelling, and loss of function in the affected shoulder. The diagnosis is typically confirmed through clinical examination and imaging studies, such as MRI or ultrasound, which can visualize the tendon integrity and any associated synovial disorders. Treatment options may include conservative management with physical therapy and anti-inflammatory medications, or surgical intervention to repair the ruptured tendon, depending on the severity of the rupture and the patient's functional needs. Accurate coding is essential for proper reimbursement and to reflect the complexity of the condition.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating between spontaneous and traumatic ruptures
  • Identifying associated conditions like tenosynovitis
  • Understanding the anatomical specifics of the flexor tendons
  • Documenting the severity and functional impact of the rupture

Audit Risk Factors

  • Inadequate documentation of the spontaneous nature of the rupture
  • Failure to document associated conditions like tenosynovitis
  • Incorrect coding of the surgical procedure performed
  • Lack of clarity in the patient's functional limitations

Specialty Focus

Medical Specialties

Orthopedic Surgery

Documentation Requirements

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

Common Clinical Scenarios

Patients presenting with acute shoulder pain and loss of function, often requiring surgical intervention.

Billing Considerations

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

Physical Medicine and Rehabilitation

Documentation Requirements

Comprehensive evaluations of functional status and rehabilitation progress.

Common Clinical Scenarios

Patients undergoing rehabilitation post-surgery or those managed conservatively.

Billing Considerations

Documenting the patient's response to therapy and any modifications to the treatment plan.

Coding Guidelines

Inclusion Criteria

Use M66.312 When
  • Follow the official ICD
  • CM coding guidelines, ensuring accurate documentation of the spontaneous rupture and any associated conditions

Exclusion Criteria

Do NOT use M66.312 When
  • Exclude codes for traumatic ruptures unless specified

Related ICD-10 Codes

Related CPT Codes

23470CPT Code

Repair of ruptured tendon, shoulder

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 surgical details 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 diagnoses and treatment plans.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of spontaneous tendon ruptures, improving the accuracy of diagnoses and treatment plans.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of spontaneous tendon ruptures, improving the accuracy of diagnoses and treatment plans.

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 M66.312 and M66.311?

M66.312 refers specifically to spontaneous rupture of flexor tendons in the left shoulder, while M66.311 refers to the right shoulder.