PARKER DUNCAN DIAZ, MD, MPH, FAAFP appears in the CMS NPPES registry as a Addiction Medicine (Family Medicine) Physician provider holding MD, MPH, FAAFP credentials at 751 LOMBARDI CT, SANTA ROSA, CA, 95407, with a listed phone of (707) 547-2222. NPI 1033434923 was issued on 04/02/2010. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what DUNCAN DIAZ 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 records for calendar year 2023 show 1,498 prescription claims written by this provider, covering 92 Medicare beneficiaries and totaling roughly $235K in drug spend, split 15% brand-name and 85% generic by claim count, with an opioid prescribing rate of 6.2%. These figures capture only Medicare Part D — commercial insurance, Medicaid, and cash-pay prescriptions are not included, and any drug-beneficiary cell under 11 is suppressed by CMS for patient privacy.

Addiction Medicine (Family Medicine) Physician is a narrow specialty nationwide, with 763 enrolled providers across 48 states and an average of 1,134 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.