ICD-10 Code L05.9 – Pilonidal cyst and sinus without abscess (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L05.9 – Pilonidal cyst and sinus without abscess
What it is
This code identifies a pilonidal cyst or sinus in the natal cleft or nearby sacrococcygeal area when there is no abscess. It usually represents a chronic sinus tract or cyst that may intermittently drain.
Clinical signs
Common findings include a small opening, localized tenderness, or drainage near the tailbone. Clinical features vary; refer to documentation for whether the condition is cyst, sinus, or both, and whether abscess is absent.
When to use this code
Use L05.9 when the provider documents pilonidal disease without abscess, including a chronic sinus or cyst with or without minor drainage. Apply it when the record does not describe an active abscess or acute purulent collection. If the note is unclear, check documentation before coding.
Do not use for
Do not use this code if an abscess is documented, because that requires a different pilonidal code. Also avoid it when the finding is another perianal, skin, or soft tissue lesion unrelated to pilonidal disease.
Coding tip
Verify the exact provider wording, especially the presence or absence of abscess, before assigning L05.9.