L65.1

What This Code Means

Temporary hair loss that occurs when hair follicles are damaged during the active growth phase, often caused by chemotherapy, radiation, or severe trauma.

Coding Tips

• •Link this code with the causative agent (chemotherapy drug, radiation therapy, or trauma) using appropriate external cause codes when applicable
• •Document the timing and severity of hair loss to help distinguish from telogen effluvium and guide treatment expectations