In simple words: This code describes a problem near the tailbone, a pilonidal cyst or sinus.It's a small pocket or tunnel that can sometimes get infected and filled with pus.It's often caused by ingrown hairs.

L05 encompasses pilonidal cysts and sinuses, which are abnormal cavities or tracts near the tailbone (coccyx).These can be simple cysts without infection or infected, resulting in abscess formation.The condition often involves ingrown hairs, inflammation, and potential pus accumulation.Specific codes (L05.0 and L05.9) further classify presence or absence of an abscess.

Example 1: A patient presents with pain and swelling near the tailbone, with a palpable fluctuant mass (abscess).The diagnosis is pilonidal cyst with abscess (L05.0), and incision and drainage are performed., A patient reports a small, painless dimple near the tailbone with no signs of infection.The diagnosis is pilonidal cyst without abscess (L05.9), and conservative management (observation or minor procedures) is chosen., A patient undergoes surgical excision of a recurrent pilonidal sinus. Following surgery, the patient experiences mild infection and requires further wound care management. The diagnosis is L05.9 with additional codes for wound infection and postoperative care.

Complete history and physical examination, including location, size, and characteristics of the lesion; documentation of any associated signs and symptoms (pain, swelling, redness, drainage); results of any diagnostic imaging (if performed); details of the procedure performed (incision and drainage, excision, etc.); and post-operative care or follow-up.

** The use of additional codes to specify the infectious agent, if an abscess is present, is important for accurate coding.Always refer to the most current version of the ICD-10-CM coding manual for the most updated information.