Codes / ICD10CM / M67.361

M67.361 Transient synovitis, right knee

ICD10CM code

ICD10CM

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Name of the Condition

  • Transient Synovitis, Right Knee

Summary

Transient synovitis of the right knee is a self-limiting inflammatory condition affecting the synovial membrane of the knee joint. It typically presents with knee pain and limited mobility, often resolving without long-term sequelae.

Causes

The exact cause is often unknown but may follow viral infections, minor trauma, or joint stress. Allergic reactions or overuse can also contribute to its development.

Risk Factors

  • Recent upper respiratory infections may increase susceptibility.
  • Physical activity or minor knee injuries could precede onset.
  • More common in children and young adults, though it can occur at any age.

Symptoms

  • Sudden onset of knee pain, usually unilateral.
  • Limping or reluctance to bear weight on the affected limb.
  • Mild swelling or tenderness around the joint.
  • Discomfort with movement or weight-bearing on the affected leg.

Diagnosis

Diagnosis is primarily clinical, based on history and physical examination. Ultrasound may confirm joint effusion, while blood tests and X-rays help rule out other conditions like septic arthritis or fractures.

Treatment Options

  • Rest and avoidance of aggravating activities.
  • Nonsteroidal anti-inflammatory drugs (NSAIDs) for pain and inflammation.
  • Supportive care until symptoms resolve, typically within weeks.

Prognosis and Follow-Up

Most cases resolve within weeks with no long-term effects. Follow-up may involve monitoring for recurrence or ruling out other conditions if symptoms persist.

Complications

Rarely, transient synovitis may be confused with septic arthritis, which requires prompt treatment. Persistent symptoms could indicate an underlying condition.

Lifestyle & Prevention

  • Avoid overuse or repetitive stress on the knee joint.
  • Maintain overall joint health through regular, low-impact exercise.
  • Promptly address minor injuries or infections to reduce risk.

When to Seek Professional Help

Seek medical attention if symptoms worsen, persist beyond a few weeks, or if there is severe pain, fever, or inability to bear weight.

Tips for Medical Coders

Document the specific site (right knee) and clinical findings to support the code M67.361. Ensure differentiation from other knee conditions, such as septic arthritis or fractures, to avoid miscoding.

Medical Policies and Guidelines

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