THAO MARQUEZ, MD,MS appears in the CMS NPPES registry as a General Practice Physician provider holding MD,MS credentials at 621 S NEW BALLAS RD, CREVE COEUR, MO, 63141, with a listed phone of (314) 251-6840. NPI 1275696866 was issued on 12/18/2006. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what MARQUEZ 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 277 prescription claims written by this provider, covering 97 Medicare beneficiaries and totaling roughly $7K in drug spend, split 9% brand-name and 91% 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 83.8451/100 for the 2023 performance year (Quality 84.5974, Cost 58.6394), compared with the national average of 83.1.

General Practice Physician is a mid-sized specialty nationwide, with 16,677 enrolled providers across 56 states and an average of 2,872 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.