M71.179 Other infective bursitis, unspecified ankle and foot

Name of the Condition

• Other infective bursitis, unspecified ankle and foot

Summary

Other infective bursitis, unspecified 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, unspecified 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 adjacent joints
• Pus drainage if the infection progresses

Diagnosis

Diagnosis involves a physical examination to assess bursal characteristics, including tenderness, fluctuance, and overlying skin changes. Imaging studies (e.g., ultrasound) may be used to evaluate the bursa and rule out other conditions. Aspiration of the bursa for fluid analysis (e.g., Gram stain, culture) helps identify the causative organism and guide treatment. Laboratory tests, such as complete blood count (CBC) or inflammatory markers, may support the diagnosis of infection.

Treatment Options

Treatment typically includes antibiotic therapy targeted at the identified or suspected pathogen, often initiated empirically while awaiting culture results. Drainage of the infected bursa (e.g., aspiration or surgical intervention) may be necessary for severe or persistent cases. Rest, elevation, and pain management (e.g., NSAIDs) are supportive measures. In chronic or recurrent cases, surgical removal of the bursa (bursectomy) may be considered.

Prognosis and Follow-Up

Prognosis depends on the severity of infection, timeliness of treatment, and underlying health factors. Early intervention usually leads to resolution with minimal functional impairment. Follow-up may involve monitoring for symptom improvement, repeat imaging if needed, and adjusting antibiotics based on culture results. Chronic cases or those with complications may require longer-term management.

Complications

• Spread of infection to adjacent tissues or joints
• Abscess formation within the bursa
• Chronic bursitis or persistent pain
• Functional limitations due to scarring or tissue damage
• Systemic infection (e.g., sepsis) in severe cases

Lifestyle & Prevention

• Avoid trauma or excessive pressure to the ankle/foot area
• Promptly treat skin wounds or infections near bursae
• Maintain good foot hygiene and wear appropriate footwear
• Manage chronic conditions (e.g., diabetes) to reduce infection risk
• Use protective gear during activities that stress the ankle/foot

When to Seek Professional Help

Seek medical attention if symptoms worsen (e.g., increasing pain, swelling, or fever), if pus drainage occurs, or if there is no improvement with initial care. Immediate evaluation is necessary for signs of systemic infection (e.g., chills, confusion) or if the infection spreads to other areas.

Tips for Medical Coders

Document the anatomical location (ankle/foot) and specify whether the infection is bacterial or non-bacterial if known. Ensure the code M71.179 is used only when the site is unspecified and not classified under a more specific infective bursitis code. Include details about the causative organism, treatment, and any complications to support accurate coding and clinical correlation.