ICD-10 Code L05.0 – Pilonidal cyst and sinus with abscess (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L05.0 – Pilonidal cyst and sinus with abscess
What it is
This code identifies a pilonidal cyst or sinus that is actively infected and has formed an abscess, usually near the natal cleft. Use it when documentation clearly states abscess or a draining infected pilonidal lesion.
Clinical signs
Typical findings include pain, swelling, redness, and tenderness over the sacrococcygeal area. You may also see drainage, fluctuance, or a visible sinus opening; clinical features vary, so refer to documentation.
When to use this code
Use L05.0 when the provider documents pilonidal cyst, pilonidal sinus, or pilonidal disease with abscess. It also fits cases described as an infected pilonidal lesion requiring drainage or showing purulent collection. If abscess is not documented, check documentation before assigning this code.
Do not use for
Do not use this code for an uncomplicated pilonidal cyst or sinus without abscess; those are coded elsewhere. Also avoid it when the lesion is in a different anatomic site or the record is unclear.
Coding tip
Confirm the word “abscess” or equivalent infected collection in the note before coding L05.0.