MARK VIERRA, MD appears in the CMS NPPES registry as a Surgery Physician provider holding MD credentials at 2 UPPER RAGSDALE DR, MONTEREY, CA, 93940, with a listed phone of (831) 649-0808. NPI 1295706448 was issued on 01/27/2006. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what VIERRA 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 287 prescription claims written by this provider, covering 99 Medicare beneficiaries and totaling roughly $15K in drug spend, split 4% brand-name and 96% generic by claim count, with an opioid prescribing rate of 21.3%. 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. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 77.8126/100 for the 2023 performance year (Quality 68.9951, Cost 57.0468), compared with the national average of 83.1.

Surgery Physician is a mid-sized specialty nationwide, with 36,191 enrolled providers across 56 states and an average of 169 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.