Patrick Mastin, MD appears in the CMS NPPES registry as a Rheumatology Physician provider holding MD credentials at 8975 EXECUTIVE PARK DR STE 200, Knoxville, TN, 37923, with a listed phone of (865) 691-4100. NPI 1811251655 was issued on 06/26/2012. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what Mastin 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 2,130 prescription claims written by this provider, covering 605 Medicare beneficiaries and totaling roughly $1.2 million in drug spend, with an opioid prescribing rate of 1.2%. 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.

Rheumatology Physician is a mid-sized specialty nationwide, with 6,181 enrolled providers across 52 states and an average of 2,054 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.