ICD-10-CM > L00-L99 > L00-L08 > L05 > L05.9 > L05.91 L05.91 Pilonidal cyst without abscess Billable/Specific Copy Code Copy Description Applicable To Pilonidal dimplePostanal dimplePilonidal cyst NOS Type 2 Excludes congenital sacral dimple (Q82.6)parasacral dimple (Q82.6)