ICD-10-CM Billable Code

L02.421

Furuncle of right axilla

Clinical Classification Guidelines

Medical Intelligence & Overview

A furuncle, commonly known as a boil, is a painful, pus-filled bump that forms under the skin when a hair follicle becomes infected with bacteria. When this occurs in the right axilla (armpit area), it is classified under ICD-10 code L02.421. These infections are generally caused by *Staphylococcus aureus* bacteria and can develop when bacteria invade and inflame hair follicles within the skin of the armpit, leading to a localized abscess. Recognizing the symptoms and understanding the causes can help in managing this condition effectively.

Causes & Symptoms

Clinical Causes: Bacterial infection, most commonly *Staphylococcus aureus* Poor hygiene or sweating in the armpit area Skin trauma or cuts in the armpit area Obesity, which can increase skin friction and sweating Immunocompromised states, such as diabetes or HIV/AIDS Hormonal changes that increase sweat and oil production

Key Symptoms: A tender, firm lump or swelling in the right armpit Redness and warmth around the affected area Pain or tenderness, especially when touched Pus that may drain from the boil Swelling and discomfort that can worsen over time Possible fever if the infection becomes more widespread or severe

Diagnostic & Treatment

Diagnosis Path: Diagnosis typically involves a physical examination of the affected area, noting the characteristic appearance of the boil. In some cases, a healthcare provider may perform a sample of the pus (wound culture) to identify the bacteria responsible. Imaging tests are rarely needed but can be used if an abscess is deep or if other complications are suspected. Accurate diagnosis helps determine the severity of the infection and the most appropriate treatment options.

Treatment Protocols: Warm compresses applied to the area to promote drainage and reduce pain Good hygiene practices to prevent spread and aid healing Drainage of the abscess by a healthcare professional if it does not drain spontaneously Use of antibiotics if the infection is severe, recurrent, or if there are multiple boils Pain management with over-the-counter medications as advised Addressing underlying factors such as obesity or immune suppression to prevent recurrence

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.

Clinical Advice & FAQs

Billing Guidance

Is L02.421 a billable ICD-10 code?
Yes, L02.421 is a specific, billable code that can be used to indicate a diagnosis for reimbursement purposes.

Documentation

How do I report L02.421?
Clinical documentation must specify the nature of Furuncle of right axilla and any associated comorbidities for accurate reporting.

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