The overall goal of this research is to reduce financial toxicity related to the cost of cancer treatment in a diverse patient population. The research tests the feasibility of an application-based ("app") communication intervention designed to improve the frequency and quality of patient-oncologist treatment cost discussions during clinical interactions, which, in turn, should improve other short- and longer-term patient outcomes, including referrals to economic support (e.g., social work); efficacy in managing treatment cost; treatment cost distress; financial toxicity; and treatment adherence. If successful, this study will result in an evidence-based tool that can reduce financial toxicity and improve medical outcomes for a diverse patient population.