Catherine Youssef, M.D. appears in the CMS NPPES registry as a Diabetology (Internal Medicine) Physician provider holding M.D. credentials at 2554 W FABYAN PKWY, Batavia, IL, 60510, with a listed phone of (800) 991-6117. NPI 1306337936 was issued on 05/18/2018. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what Youssef most recently submitted to CMS rather than a vetted directory listing, which is why patients should always confirm the practice is still at this location before scheduling.

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 Diabetology (Internal Medicine) Physician providers operate outside Part D entirely.

Diabetology (Internal Medicine) Physician is a narrow specialty nationwide, with 2 enrolled providers across 2 states, 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.