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IMPORTANCE Defining which populations are affected by basal cell carcinoma (BCC) vs cutaneous squamous cell carcinoma (cSCC) may inform targeted public health strategies. Incidence of BCC and cSCC is not reported to national cancer registries, but claims data for the treatment of BCC and cSCC provide insights into the epidemiology of keratinocyte carcinoma.OBJECTIVE To define differences in the ratio of BCC to cSCC in adults (age, Ն18 years) in a large database of patients with commercial insurance and Medicare Advantage coverage. DESIGN, SETTING, AND PARTICIPANTSThis cross-sectional analysis used deidentified data derived from the Optum Clinformatics Data Mart to perform a retrospective evaluation of a large commercially insured cohort based on treatment claims from January 1, 2012, to December 31, 2016. Patients with a diagnosed and treated BCC or cSCC as determined by codes from the

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