S86.01 Strain of Achilles tendon

Name of the Condition

• Strain of Achilles tendon

Summary

A strain of the Achilles tendon involves overstretching or tearing of the tendon fibers that connect the calf muscles to the heel bone. This injury can affect mobility and is often associated with activities involving foot movement, such as walking, running, or jumping.

Causes

Sudden increases in physical activity, intense exercise without proper warm-up, or repetitive strain during sports or activities can lead to an Achilles tendon strain. Direct trauma or overuse may also contribute to the injury.

Risk Factors

• Participation in sports involving running or jumping
• Wearing improper footwear
• Uneven or stiff walking surfaces
• Previous lower limb injuries
• Poor calf muscle flexibility or strength

Symptoms

• Pain along the back of the leg or near the heel
• Swelling and tenderness
• Stiffness, especially in the morning or after activity
• Difficulty walking and reduced range of motion

Diagnosis

Diagnosis is based on a physical examination by a healthcare provider, analysis of the patient's history (including recent activities and symptoms), and imaging tests like MRI or ultrasound to assess tendon damage.

Treatment Options

• Rest and avoiding activities that worsen symptoms
• Ice application to reduce swelling
• Compression bandages to minimize movement and swelling
• Elevation of the foot to reduce swelling
• Nonsteroidal anti-inflammatory drugs (NSAIDs) for pain relief
• Physical therapy

Prognosis and Follow-Up

Prognosis depends on the severity of the strain and adherence to treatment. Most mild to moderate strains heal with conservative care, but severe cases may require longer recovery or surgical intervention. Follow-up appointments monitor healing and adjust treatment as needed.

Complications

• Chronic pain or instability
• Repeated injuries
• Tendon rupture (in severe cases)
• Limited mobility or functional impairment

Lifestyle & Prevention

• Warm up properly before exercise
• Wear supportive footwear
• Gradually increase activity intensity
• Strengthen calf muscles through targeted exercises
• Avoid uneven surfaces during physical activity

When to Seek Professional Help

Seek medical attention if pain is severe, swelling worsens, or mobility is significantly impaired. Prompt evaluation is important if symptoms do not improve with rest or if there is an audible "pop" at the time of injury.

Tips for Medical Coders

Document the location (e.g., right/left) and encounter type (e.g., initial, subsequent) as applicable. Ensure clinical details support the strain diagnosis, including symptom onset, activity-related triggers, and physical examination findings. Code S86.01 is specific to the Achilles tendon strain; verify no other injuries or conditions are present that would require additional coding.