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ICD-10 Guide
ICD-10 CodesM66.177

M66.177

Billable

Rupture of synovium, right toe(s)

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

Code Description

ICD-10 M66.177 is a billable code used to indicate a diagnosis of rupture of synovium, right toe(s).

Key Diagnostic Point:

Rupture of the synovium in the right toe(s) refers to the tearing or disruption of the synovial membrane that lines the joints and tendon sheaths in the toes. This condition can occur due to trauma, repetitive stress, or underlying inflammatory conditions such as rheumatoid arthritis or gout. The synovium plays a crucial role in joint health by producing synovial fluid, which lubricates the joints and nourishes the cartilage. When the synovium is ruptured, it can lead to pain, swelling, and decreased range of motion in the affected toe(s). Patients may present with localized tenderness, warmth, and swelling, and may report difficulty in walking or bearing weight on the affected foot. Diagnosis typically involves a thorough clinical examination, imaging studies such as ultrasound or MRI, and sometimes aspiration of the joint to analyze synovial fluid. Treatment may include conservative measures such as rest, ice, compression, and elevation (RICE), as well as corticosteroid injections or surgical intervention if conservative management fails. Surgical options may involve synovectomy or repair of the ruptured synovium, depending on the severity of the rupture and associated conditions.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating between acute and chronic conditions
  • Identifying associated conditions such as tenosynovitis or arthritis
  • Understanding the implications of surgical versus non-surgical treatment
  • Accurate documentation of the location and extent of the rupture

Audit Risk Factors

  • Inadequate documentation of the mechanism of injury
  • Failure to specify the exact location of the rupture
  • Lack of imaging studies to support the diagnosis
  • Inconsistent coding of associated conditions

Specialty Focus

Medical Specialties

Orthopedics

Documentation Requirements

Detailed notes on the mechanism of injury, physical examination findings, imaging results, and treatment plan.

Common Clinical Scenarios

Patients presenting with acute toe pain following trauma, chronic pain due to repetitive stress injuries, or inflammatory conditions affecting the synovium.

Billing Considerations

Ensure clarity in documentation regarding the extent of the rupture and any associated tendon injuries.

Rheumatology

Documentation Requirements

Comprehensive assessment of joint involvement, history of inflammatory conditions, and response to previous treatments.

Common Clinical Scenarios

Patients with rheumatoid arthritis experiencing acute exacerbations or new joint symptoms.

Billing Considerations

Document any systemic symptoms or laboratory findings that may indicate an underlying rheumatologic condition.

Coding Guidelines

Inclusion Criteria

Use M66.177 When
  • Follow official ICD
  • CM guidelines for coding injuries and conditions affecting the musculoskeletal system
  • Ensure accurate documentation of the rupture's location and any associated conditions
  • Include any relevant external cause codes if applicable

Exclusion Criteria

Do NOT use M66.177 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

20610CPT Code

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

Clinical Scenario

Used when aspiration of the joint is performed to relieve swelling.

Documentation Requirements

Document the reason for aspiration, the amount of fluid removed, and any findings.

Specialty Considerations

Orthopedic specialists should ensure clear documentation of joint involvement.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of conditions like synovial ruptures, improving the accuracy of patient records and facilitating better treatment planning.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of conditions like synovial ruptures, improving the accuracy of patient records and facilitating better treatment planning.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of conditions like synovial ruptures, improving the accuracy of patient records and facilitating better treatment planning.

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 synovial rupture in the toes?

Synovial rupture in the toes can be caused by acute trauma, such as a fall or impact injury, or by chronic conditions like rheumatoid arthritis that lead to inflammation and weakening of the synovial membrane.