Background: Use of phototherapy in the United States declined during the 1990s, largely due to unfavorable economic incentives. The trends in phototherapy since then are not well characterized.
Methods: We analyzed the National Ambulatory Medical Care Survey (NAMCS) data on quantity of phototherapy visits and associated diagnoses and payment sources. Trends were assessed by linear regression.
Results: There were an estimated 230 000 outpatient phototherapy visits per year, with an increasing trend over time (p = 0.03). Dermatologists managed 87% of the visits. Leading diagnoses associated with phototherapy included psoriasis (25%), dermatitis NOS (6%), vitiligo (6%), other dyschromia (6%), and actinic keratosis (5%).
Conclusions: Use of phototherapy for psoriasis has remained relatively low up to 2010. However, phototherapy may be becoming more frequent for conditions other than psoriasis.