Fig. 2

Access to chemotherapy providers within a 20-min driving-time radius for lung cancer patients. Three representative SEER registries are included: Iowa, New Jersey and Connecticut. In Panel a, providers were identified using specialty codes. In Panel b, providers were identified by chemotherapy-related billing codes. Brownish-grey areas indicate that there were no patients diagnosed with lung cancer in that ZIP code during the study period. Green ZIP codes indicate that a chemotherapy provider was available within 20-min driving time of that ZIP code. No chemotherapy provider was available within a 20-min driving time for yellow ZIP codes. Maps were created using Microsoft MapPoint 2013