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L02.9 – Cutaneous Abscess, Furuncle, Carbuncle
L02.9 is an ICD-10 code for cutaneous abscess, furuncle, or carbuncle at an unspecified body site. These are typically painful, bacteria-driven pus-filled lesions of the skin.
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L02.9 is an ICD-10 code for cutaneous abscess, furuncle, or carbuncle at an unspecified body site. These are typically painful, bacteria-driven pus-filled lesions of the skin.
What Does the ICD-10 Code L02.9 Mean?
The ICD-10 code L02.9 stands for cutaneous abscess, furuncle, and carbuncle at an unspecified site. It is used when such a skin condition has been diagnosed but the exact body location is not specified or is unclear from the clinical context. L02.9 belongs to the ICD-10 category L02 (Cutaneous abscess, furuncle and carbuncle) and is a commonly used diagnostic code in both outpatient and inpatient settings.
Causes
Cutaneous abscesses, furuncles, and carbuncles are generally caused by bacterial infections of the skin and underlying tissue structures. The most common pathogens include:
- Staphylococcus aureus (including MRSA)
- Streptococcal species
- Rarely other gram-positive or gram-negative bacteria
Contributing risk factors include minor skin injuries, poor hygiene, a weakened immune system, diabetes mellitus, and chronic skin conditions.
Definitions of the Conditions
Cutaneous Abscess
A cutaneous abscess is an encapsulated collection of pus within the tissue. It develops as a result of a localized bacterial infection in which tissue necrosis occurs and pus accumulates. The abscess is surrounded by a connective tissue capsule and can develop at any location on the body.
Furuncle
A furuncle (commonly known as a boil) is a deep, purulent inflammation of a hair follicle and surrounding tissue. It typically begins as a small, red, tender papule and progresses into a pus-filled nodule. Furuncles occur most frequently in areas subject to friction or sweating, such as the neck, armpits, buttocks, and thighs.
Carbuncle
A carbuncle is a cluster of several furuncles that drain together. It is deeper and more extensive than a single furuncle and may be accompanied by fever and general malaise.
Symptoms
- Painful, erythematous swelling of the skin
- Local warmth and tenderness on palpation
- Fluctuant (soft, yielding) nodule when the abscess is mature
- Possible spontaneous or induced drainage of pus
- Fever and fatigue in cases of carbuncle or extensive infection
Diagnosis
Diagnosis is usually made clinically through inspection and palpation of the affected skin area. In cases of uncertainty or suspected deeper infection, imaging techniques such as ultrasound may be used. Microbiological examination of the pus (swab or culture) assists in pathogen identification and resistance testing, particularly in recurrent or difficult-to-treat cases.
Treatment
Conservative Management
Small, immature abscesses or furuncles may initially be managed with warm compresses and rest to encourage maturation of the lesion.
Surgical Treatment
The primary treatment for a mature abscess is incision and drainage (surgical opening and irrigation). This ensures complete evacuation of the pus and accelerates healing.
Antibiotic Therapy
Antibiotic treatment is indicated in the following situations:
- Extensive or deep infections
- Fever or systemic signs of infection
- Immunocompromised patients
- Facial furuncles (risk of sinus thrombosis)
- Suspected MRSA infection
Commonly used antibiotics include flucloxacillin, first-generation cephalosporins, or in cases of suspected MRSA, trimethoprim/sulfamethoxazole or clindamycin.
References
- World Health Organization (WHO): ICD-10 Version 2019, Category L02 – Cutaneous abscess, furuncle and carbuncle.
- Stevens DL et al. – Practice Guidelines for the Diagnosis and Management of Skin and Soft Tissue Infections: 2014 Update by the Infectious Diseases Society of America. Clinical Infectious Diseases, 2014.
- Baddour LM – Skin abscesses, furuncles, and carbuncles. UpToDate, Wolters Kluwer, 2023.
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