ICD-10 Code L72.11 – Pilar cyst (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L72.11 – Pilar cyst
What it is
L72.11 identifies a pilar cyst, a benign cyst arising from the hair follicle structure, most often on the scalp. It usually represents a slow-growing, well-defined skin lump.
Clinical signs
Typical findings include a firm, round, mobile nodule under the skin, commonly on the scalp. Clinical features vary; refer to documentation if the lesion is painful, inflamed, or recurrent.
When to use this code
Use L72.11 when the provider documents a pilar cyst, trichilemmal cyst, or equivalent diagnosis. Apply it when the record clearly identifies the lesion as this specific cyst type, even if it is asymptomatic.
If the note only says “cyst” or “scalp mass” without a specific diagnosis, check documentation before coding. The code is appropriate for confirmed pilar cysts, not for unspecified skin lumps.
Do not use for
Do not use L72.11 for epidermoid cysts, sebaceous cysts, or other unspecified cysts unless the provider specifically documents pilar cyst. Check documentation when the diagnosis is unclear.
Coding tip
Code the documented cyst type exactly; “scalp cyst” alone is not enough for L72.11.