Narrowband UVB phototherapy
The Korea Disease Control and Prevention Agency describes narrowband UVB as 311 nm ultraviolet B treatment.
Dermatological ultraviolet therapy codes MM331 through MM334 divide the billed service by the treated body-area band, and vitiligo is a named indication.
Ministry of Health and Welfare Notice No. 2015-139 recognizes up to three covered sessions per week, while the treating dermatologist still decides the individual schedule and exposure.