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L05.9 Pilonidal Sinus Without Abscess – ICD-10
L05.9 is the ICD-10 code for pilonidal sinus without abscess, a cyst or channel near the tailbone often caused by ingrown hairs. It may cause pain and discharge.
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L05.9 is the ICD-10 code for pilonidal sinus without abscess, a cyst or channel near the tailbone often caused by ingrown hairs. It may cause pain and discharge.
What is L05.9?
The ICD-10 code L05.9 refers to pilonidal sinus without abscess. A pilonidal sinus (also called a pilonidal cyst or pilonidal disease) is a small abnormal pocket or tunnel in the skin near the tailbone (coccyx), typically located in the cleft between the buttocks. The sinus can become filled with ingrown hairs, skin debris, and fluid, leading to chronic irritation or infection.
Causes
The exact cause of pilonidal sinus is not fully understood, but several contributing factors have been identified:
- Ingrown hairs: Hair penetrates the skin and triggers a foreign body reaction, leading to sinus formation.
- Mechanical pressure and friction: Prolonged sitting, rubbing, and pressure in the gluteal region promote the development of the condition.
- Excessive body hair: More common in individuals with dense or coarse hair in the affected area.
- Poor hygiene or excessive sweating: Can contribute to the onset and worsening of symptoms.
- Genetic predisposition: A family history of pilonidal sinus increases the risk.
Symptoms
In the case of L05.9 (without abscess), symptoms may range from mild to moderate:
- Pain or pressure in the tailbone area, especially when sitting
- Visible small opening or pit in the intergluteal cleft
- Occasional discharge of fluid or blood from the sinus opening
- Local redness and mild swelling without significant pus formation
- Itching or a sensation of a foreign body
Unlike L05.0 (pilonidal sinus with abscess), L05.9 does not involve acute purulent (pus-forming) infection.
Diagnosis
Diagnosis is typically made through clinical examination:
- Physical examination: Inspection of the intergluteal cleft; one or more pits or sinus openings are usually visible.
- Medical history: Questions regarding onset, duration, previous episodes, and associated symptoms.
- Imaging: Ultrasound or MRI may be used in complex or recurrent cases to assess the extent of the sinus tracts.
- Differential diagnosis: Conditions such as anal fistula, furuncle, or hidradenitis suppurativa must be ruled out.
Treatment
Treatment depends on the severity and clinical presentation of the condition:
Conservative Management
- Regular cleaning and shaving or hair removal of the affected area
- Sitz baths and topical skin care measures
- Hair removal methods such as laser epilation or depilatory creams to prevent recurrence
Surgical Treatment
- Excision of the sinus: Surgical removal of the entire sinus and associated tracts
- Pit picking (Bascom I procedure): Minimally invasive removal of the pit openings while preserving surrounding healthy tissue
- Sinusectomy (Karydakis flap, Limberg flap): Plastic surgical techniques designed to close the defect and reduce the risk of recurrence
The choice of procedure depends on the extent of the disease, the number of previous recurrences, and patient preferences. Regular wound care and follow-up after surgery are essential for successful outcomes.
Prognosis
Without treatment, pilonidal sinus disease tends to become chronic and may recur. With appropriate management, the prognosis is generally good. Recurrence can be minimized through consistent hair removal and proper wound care after surgical intervention.
References
- World Health Organization (WHO): ICD-10 Classification of Mental and Behavioural Disorders – L05 Pilonidal cyst. Geneva: WHO.
- Iesalnieks I, Damin DC: Pilonidal sinus disease. Colorectal Disease, 2019; 21(8): 867–874.
- Deutsche Gesellschaft für Koloproktologie (DGK): S3 Guideline Pilonidal Sinus, AWMF Registration No. 081-009, 2020.
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