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L05.0 – Pilonidal Sinus with Abscess | ICD-10
L05.0 is the ICD-10 code for a pilonidal sinus with abscess, a painful inflammatory condition in the tailbone area.
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L05.0 is the ICD-10 code for a pilonidal sinus with abscess, a painful inflammatory condition in the tailbone area.
What is L05.0?
L05.0 is a diagnostic code from the ICD-10 classification system (International Classification of Diseases, 10th Revision). It refers to a pilonidal sinus with abscess – an inflammatory condition occurring in the sacrococcygeal region, commonly known as the tailbone area.
A pilonidal sinus (also called a pilonidal cyst or pilonidal fistula) is an inflamed cavity or tract beneath the skin, typically forming in the natal cleft between the buttocks. When coded as L05.0, the sinus is accompanied by an abscess – a localized collection of pus that causes acute pain and discomfort.
Causes
The exact cause of a pilonidal sinus is not fully understood, but several contributing factors have been identified:
- Ingrown hairs: Hair shafts can penetrate the skin and trigger a foreign body reaction.
- Friction and pressure: Prolonged sitting, for example during office work or long car journeys, increases the risk.
- Sweating and poor hygiene: These can promote bacterial colonization in the affected area.
- Dense or coarse body hair: The condition is more common in individuals with thick or curly hair.
- Anatomical factors: A deep natal cleft can predispose individuals to the condition.
Symptoms
Patients with a pilonidal sinus with abscess (L05.0) may experience the following symptoms:
- Severe, throbbing pain in the tailbone area
- Visible redness and swelling in the natal cleft
- A sensation of warmth over the affected site
- Discharge of pus from a small opening (sinus tract opening)
- Fever and general malaise in more severe cases
Diagnosis
Diagnosis is typically made clinically through a physical examination by a healthcare professional. Characteristic features such as the location of the swelling, fluctuation (a fluid-like sensation on pressure), and visible sinus openings are diagnostically indicative. Ultrasound or MRI imaging may be used in ambiguous or recurrent cases.
Treatment
Acute Management
In the case of an acute abscess (L05.0), surgical incision and drainage is the standard treatment. The abscess is opened under local or general anesthesia, the pus is drained, and the cavity is cleaned. This provides rapid pain relief.
Definitive Surgical Treatment
Once the acute inflammation has resolved, surgical excision of the entire sinus is usually recommended to prevent recurrence. Several operative techniques are available:
- Open excision with secondary wound healing
- Pit-picking technique (minimally invasive)
- Karydakis flap or Limberg flap plasty (reconstructive surgical techniques)
Supportive Measures
Following surgery and to help prevent recurrence, the following measures are recommended:
- Regular shaving or laser hair removal of the affected area
- Careful hygiene practices
- Avoiding prolonged sitting
- Weight reduction in cases of obesity
References
- World Health Organization (WHO): International Statistical Classification of Diseases and Related Health Problems, 10th Revision (ICD-10). Geneva: WHO.
- Iesalnieks I, Ommer A. The management of pilonidal sinus. Deutsches Aerzteblatt International, 2019; 116(1–2): 12–21. doi:10.3238/arztebl.2019.0012
- Stauffer VK, Luedi MM, Kauf P, et al. Common surgical procedures in pilonidal sinus disease: A meta-analysis, merged data analysis, and comprehensive study on recurrence. Scientific Reports, 2018; 8(1): 3058. doi:10.1038/s41598-018-21081-z
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