Yingxi Chen, MD, PHD appears in the CMS NPPES registry as a Research Study Specialist provider holding MD, PHD credentials at 8 THE GRN # 23699, Dover, DE, 19901, with a listed phone of (757) 689-7437. NPI 1649121138 was issued on 02/09/2026.

Medicare Part D prescribing data is not currently published for this NPI, which typically means the provider either wrote fewer than 11 Part D claims in the most recent reporting year, does not participate in Medicare, or practices in a specialty that rarely prescribes outpatient drugs. Absence of prescribing data is not a quality signal, many Research Study Specialist providers operate outside Part D entirely.

Research Study Specialist is a narrow specialty nationwide, with 485 enrolled providers across 42 states and an average of 601 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.

Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.