DONALD DEMATTEIS, DDS, MS appears in the CMS NPPES registry as a Dental Assistant provider holding DDS, MS credentials at 32105 1ST AVE S., FEDERAL WAY, WA, 98003, with a listed phone of (253) 838-2884. NPI 1366777393 was issued on 10/08/2009. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what DEMATTEIS 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 Dental Assistant providers operate outside Part D entirely.

Dental Assistant is a narrow specialty nationwide, with 2,803 enrolled providers across 49 states and an average of 82 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.