L02.229 Furuncle of trunk, unspecified

Name of the Condition

• Furuncle of trunk, unspecified
• Also known as a boil or abscess of the trunk (unspecified site)

Summary

A furuncle, commonly referred to as a boil, is a painful, pus-filled bump that forms under the skin due to a bacterial infection usually involving a hair follicle. When occurring on the trunk (chest, abdomen, back, or flank) without specifying the exact site, it is termed a "Furuncle of trunk, unspecified."

Causes

Typically caused by the bacterium Staphylococcus aureus. Can develop due to bacteria entering the hair follicle through cuts, scrapes, or other breaks in the skin.

Risk Factors

• Poor hygiene
• Close contact with others who have boils
• Compromised immune system
• Diabetes
• Wearing tight or non-breathable clothing that irritates the skin

Symptoms

• Reddish, swollen bump on the trunk
• Pain and tenderness in the affected area
• Pus or drainage from the boil
• Itching before the boil forms

Diagnosis

Mainly through physical examination. Swab of the pus to identify the specific bacteria, if recurring infections occur.

Treatment Options

• Warm compresses to help the boil open and drain naturally
• Incision and drainage performed by a healthcare professional in severe cases
• Antibiotics if there is a concern of a spreading infection

Prognosis and Follow-Up

With proper treatment, furuncles typically resolve without complications. Recurrences can be minimized with good hygiene and addressing underlying risk factors.

Complications

• Spread of infection to surrounding skin or deeper tissues
• Formation of carbuncles (clusters of boils)
• Scarring after healing
• Systemic infection (rare)

Lifestyle & Prevention

• Maintain good hygiene practices
• Avoid sharing personal items (e.g., towels, razors)
• Wear loose, breathable clothing
• Keep skin clean and dry, especially after sweating
• Promptly clean minor cuts or scrapes

When to Seek Professional Help

Seek medical attention if the boil is large, painful, or does not improve with home care; if there is fever, red streaks, or spreading redness; or if you have a compromised immune system.

Tips for Medical Coders

Use this code for a furuncle located on the trunk (chest, abdomen, back, or flank) when the specific site is not documented. Ensure documentation supports the trunk location and absence of more specific site details. Verify that the condition is not better described by a more specific code (e.g., abdominal wall or back) if site information is available.