M65.322 Trigger finger, left index finger

Name of the Condition

• Trigger finger, left index finger

Summary

Trigger finger, left index finger is a condition where the left index finger catches or locks in a bent position, often due to inflammation or thickening of the flexor tendon sheath. This can cause pain, stiffness, and difficulty straightening the affected finger. The condition may be acute or chronic and typically affects the left index finger specifically.

Causes

Inflammation or thickening of the flexor tendon sheath, often due to repetitive motion or overuse. Underlying conditions such as diabetes or rheumatoid arthritis. Trauma to the hand or finger. Age-related degenerative changes in the tendon or sheath.

Risk Factors

• Repetitive hand or finger movements (e.g., typing, gripping tools)
• Diabetes or other metabolic disorders
• Rheumatoid arthritis or other inflammatory conditions
• Female gender and increasing age
• Prior hand or finger injuries

Symptoms

• Finger catching or locking in a bent position
• Pain or tenderness at the base of the finger
• Stiffness, especially in the morning
• A popping or clicking sensation when moving the finger
• Difficulty straightening the finger without assistance

Diagnosis

Diagnosis typically involves a physical examination to assess finger movement and tenderness. The provider may ask the patient to open and close the hand to observe locking or catching. Imaging studies are rarely needed but may be used to rule out other conditions.

Treatment Options

• Rest and activity modification to reduce strain on the finger
• Nonsteroidal anti-inflammatory drugs (NSAIDs) for pain and inflammation
• Corticosteroid injections into the tendon sheath
• Physical therapy to improve finger mobility
• In severe or persistent cases, surgical release of the tendon sheath may be considered

Prognosis and Follow-Up

Most cases improve with conservative treatment, though recovery may take weeks to months. Follow-up appointments monitor progress and adjust treatment as needed. Surgical outcomes are generally good, with most patients regaining full finger function.

Complications

• Persistent finger stiffness or locking
• Recurrence of symptoms after treatment
• Tendon rupture (rare, usually associated with steroid injections)
• Infection (rare, associated with invasive procedures)

Lifestyle & Prevention

• Avoid repetitive gripping or forceful hand movements
• Use ergonomic tools or adjust workstations to reduce strain
• Perform hand and finger stretches regularly
• Maintain good blood sugar control if diabetic
• Use splints or braces to support the finger during activities

When to Seek Professional Help

Seek care if symptoms worsen, do not improve with home care, or interfere with daily activities. Prompt evaluation is recommended if the finger becomes stuck in a bent position and cannot be straightened.

Tips for Medical Coders

Document the specific finger affected (left index) and any contributing factors like trauma or underlying conditions. Ensure the code M65.322 is used when the left index finger is involved, and verify that laterality and digit specificity are clearly recorded in the medical record.