ICD-10 Code L72.1 – Pilar and trichodermal cyst (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L72.1 – Pilar and trichodermal cyst
What it is
L72.1 identifies a pilar, also called trichilemmal, cyst. This is a benign skin cyst that usually arises from a hair follicle and commonly appears on the scalp.
Clinical signs
These cysts are typically smooth, firm, and slow growing, often mobile under the skin. Clinical features vary; refer to documentation if the lesion is painful, inflamed, or ruptured.
When to use this code
Use L72.1 when the provider documents a pilar or trichilemmal cyst, including a scalp cyst of this type. You may also use it when pathology or exam findings confirm the diagnosis. Check documentation if the note only says “cyst” without a specific type.
Do not use for
Do not assign this code for epidermoid cysts, sebaceous cysts, or unspecified skin cysts unless the record clearly identifies a pilar cyst. If the site or type is unclear, check documentation.
Coding tip
Code the most specific cyst type documented, and do not assume “scalp cyst” means L72.1 without provider confirmation.