ICD-10 Code L05.02 – Pilonidal sinus with abscess (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L05.02 – Pilonidal sinus with abscess
What it is
This code identifies a pilonidal sinus in the natal cleft that has become infected and formed an abscess. Use it when documentation clearly states pilonidal disease with abscess.
Clinical signs
Typical findings include painful swelling, redness, and drainage near the tailbone or upper buttock crease. Clinical features vary; refer to documentation.
When to use this code
Use L05.02 when the provider documents pilonidal sinus with abscess, pilonidal abscess, or infected pilonidal disease with abscess. Code it from the record when the abscess is part of the diagnosis, not just a suspected complication. If the note is unclear, check documentation.
Do not use for
Do not use this code for pilonidal sinus without abscess or for unrelated skin abscesses in other locations. Do not assume abscess if the chart only says cyst, sinus, or drainage.
Coding tip
Match the code to the exact provider wording and confirm the abscess is documented, not implied.