M71.17 Other infective bursitis, ankle and foot

Name of the Condition

• Other infective bursitis, ankle and foot

Summary

Other infective bursitis, ankle and foot refers to an infection of a bursa (a small fluid-filled sac that reduces friction between tissues) in the ankle or foot region that is not classified under more specific infective bursitis codes. This condition involves microbial invasion of the bursa, leading to inflammation, pain, and potential functional impairment of the affected area. The infection may be bacterial or non-bacterial, and the site specification indicates the involvement of the ankle or foot.

Causes

Other infective bursitis, ankle and foot typically results from bacterial infection, often introduced through direct trauma, skin breakdown, or spread from adjacent tissues. Common causative organisms include Staphylococcus aureus. Non-bacterial infections or secondary infection of a pre-existing bursitis may also occur, though the exact etiology varies by case. The ankle and foot site designation reflects the specific anatomical location of the infected bursa.

Risk Factors

• Recent injury or surgery near an ankle or foot bursa
• Skin infections or open wounds in the ankle/foot area
• Immunocompromised states (e.g., diabetes, HIV)
• Chronic inflammatory conditions (e.g., rheumatoid arthritis)
• Repetitive motion or pressure on the ankle/foot bursa

Symptoms

• Localized pain, swelling, and warmth over the bursa
• Redness or erythema at the site
• Fever or systemic signs of infection
• Limited range of motion in the ankle or foot
• Pus drainage if the infection progresses

Diagnosis

Diagnosis involves a physical examination to assess bursal characteristics, including tenderness, warmth, and swelling. Imaging studies (e.g., ultrasound or MRI) may be used to evaluate the bursa and surrounding tissues. Aspiration of the bursa for fluid analysis (e.g., culture, cell count) can confirm infection and identify causative organisms. Clinical correlation with patient history and symptoms is essential for accurate diagnosis.

Treatment Options

Treatment typically includes antibiotic therapy (targeted or empiric) for bacterial infections, guided by culture results when available. Rest, elevation, and compression of the affected area may reduce swelling. In severe cases, surgical drainage of the infected bursa may be necessary. Pain management and physical therapy may support recovery and restore function.

Prognosis and Follow-Up

Prognosis depends on the severity of infection, timeliness of treatment, and patient factors (e.g., immune status). Early intervention generally leads to favorable outcomes with resolution of symptoms and preserved function. Follow-up may involve monitoring for recurrence, assessing treatment response, and adjusting therapy as needed. Complications (e.g., chronic infection, tissue damage) can occur if untreated or inadequately managed.

Complications

• Chronic bursitis or persistent pain
• Spread of infection to adjacent tissues or joints
• Tissue necrosis or abscess formation
• Functional impairment of the ankle or foot
• Systemic infection (e.g., sepsis) in severe cases

Lifestyle & Prevention

• Avoid repetitive trauma or excessive pressure on the ankle/foot
• Maintain good foot hygiene and promptly treat skin injuries
• Manage underlying conditions (e.g., diabetes) to reduce infection risk
• Use protective footwear during activities that stress the ankle/foot
• Seek early care for signs of infection (e.g., redness, swelling)

When to Seek Professional Help

Consult a healthcare provider if symptoms worsen (e.g., increasing pain, spreading redness), systemic signs of infection (e.g., fever) develop, or function is significantly impaired. Prompt evaluation is critical to prevent complications and ensure appropriate treatment.

Tips for Medical Coders

Document the specific anatomical site (ankle or foot) and clinical evidence of infective bursitis (e.g., infection signs, diagnostic findings) to support code assignment. Ensure differentiation from non-infective bursitis or other bursal conditions. Code M71.17 is appropriate when the infection is localized to the ankle or foot and not classified under a more specific infective bursitis code.