MARK COSTELLO, M.D. appears in the CMS NPPES registry as a Otolaryngology Physician provider holding M.D. credentials at 169 ASHLEY AVE, CHARLESTON, SC, 29425, with a listed phone of (843) 792-8299. NPI 1497103550 was issued on 05/31/2016. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what COSTELLO 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 484 prescription claims written by this provider, covering 218 Medicare beneficiaries and totaling roughly $12K in drug spend, with an opioid prescribing rate of 2.9%. 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 92.5398/100 for the 2023 performance year (Quality 97.2607, Cost 77.8719), compared with the national average of 83.1.

Otolaryngology Physician is a mid-sized specialty nationwide, with 10,895 enrolled providers across 54 states and an average of 509 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.