M23.007 Cystic meniscus, unspecified meniscus, left knee

Name of the Condition

• Cystic meniscus, unspecified meniscus, left knee
• Medical Term: Meniscal cyst, left knee

Summary

A cystic meniscus refers to a fluid-filled sac that forms within the meniscus, a C-shaped cartilage in the knee that cushions and stabilizes the joint. This condition can cause pain, swelling, and limited mobility in the affected knee.

Causes

Cystic meniscus often develops due to degenerative changes or tears within the meniscus itself. It may also result from repetitive stress or injury to the knee joint, leading to fluid accumulation in the meniscal tissue.

Risk Factors

• Active participation in sports involving repetitive knee motions (e.g., running, jumping)
• Aging, which increases the risk of degenerative changes
• Previous knee injuries or trauma
• Genetic predisposition to joint abnormalities

Symptoms

• Pain or tenderness in the knee
• Swelling or a palpable lump near the joint
• Limited range of motion
• Clicking, locking, or catching sensations during movement

Diagnosis

Diagnosis involves a physical examination to assess knee mobility and tenderness, followed by imaging tests such as MRI or ultrasound to visualize the cyst and evaluate meniscal integrity. Arthroscopy may be used in some cases to confirm the diagnosis.

Treatment Options

• Rest and physical therapy to strengthen surrounding muscles and improve flexibility
• Aspiration of the cyst to reduce swelling
• Surgical intervention in severe or persistent cases

Prognosis and Follow-Up

Most cases respond well to conservative treatment, with symptoms improving over time. Follow-up care may include regular monitoring and physical therapy to prevent recurrence. Surgical outcomes are generally favorable, but recovery time varies.

Complications

• Persistent pain or instability
• Recurrence of the cyst
• Joint damage if left untreated
• Infection or bleeding after surgical procedures

Lifestyle & Prevention

• Avoid repetitive high-impact activities that stress the knee
• Maintain a healthy weight to reduce joint load
• Use proper form during exercise or sports
• Strengthen knee muscles through targeted exercises

When to Seek Professional Help

Seek medical attention if you experience severe knee pain, swelling, or locking sensations that interfere with daily activities. Prompt evaluation is recommended if symptoms worsen or do not improve with rest.

Tips for Medical Coders

Document the specific meniscus (unspecified) and laterality (left knee) as indicated. Ensure clinical notes support the diagnosis, including details of imaging or physical exam findings. Verify that no other meniscal conditions are documented to avoid coding conflicts.