AHA Coding Clinic® for ICD-9 - 2011 Issue 4; VOLUMES 1 & 2 NEW/REVISED CODES

Pilar Cyst and Trichilemmal Cyst

Effective October 1, 2011, new codes have been created to uniquely describe pilar and trichilemmal cysts. Pilar cysts (704.41) are epidermal cysts formed by an outer wall of keratinizing epithelium without a granular layer. Essentially, a pilar cyst is an accumulation of fluid and keratin just under the skin, which can develop around the root-sheath of hair follicles. Pilar cysts are common, occurring in 5-10% of the population. They generally develop in areas with dense hair follicle concentrations, such as the scalp. These types of cysts are most often benign and malignant transformation is extremely rare. In 2%...

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