ICD-10 Code L72.12 – Trichodermal cyst (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L72.12 – Trichodermal cyst
What it is
L72.12 identifies a trichodermal cyst, a benign skin cyst that usually contains keratinous material. You use it when documentation specifically names this lesion.
Clinical signs
Clinical features vary; refer to documentation. These cysts are typically described as a small, slow-growing, firm, movable nodule under the skin.
When to use this code
Use L72.12 when the provider documents trichodermal cyst as the diagnosis, including in assessment, operative, or pathology notes. Code it for a confirmed cystic lesion of this type, not for an unspecified scalp or skin lump. If the record uses another cyst term, check documentation before assigning this code.
Do not use for
Do not use this code for sebaceous cyst, epidermoid cyst, or any lesion not documented as trichodermal cyst. If the diagnosis is uncertain or only a mass is noted, check documentation.
Coding tip
Assign the code only when the exact term appears in the record; otherwise, query or code the documented cyst type.