Joseph Zahn, M.D. appears in the CMS NPPES registry as a Dermatopathology Physician provider holding M.D. credentials at 2150 PENNSYLVANIA AVE NW, Washington, DC, 20037, with a listed phone of (202) 741-3000. NPI 1386058048 was issued on 06/19/2014. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what Zahn 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 Dermatopathology Physician providers operate outside Part D entirely.

Dermatopathology Physician is a narrow specialty nationwide, with 570 enrolled providers across 48 states and an average of 650 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.