JOHN MCMAHAN, MD appears in the CMS NPPES registry as a Otolaryngic Allergy Physician provider holding MD credentials at 247 S NICOLET RD, APPLETON, WI, 54914, with a listed phone of (888) 938-3838. NPI 1518910272 was issued on 05/17/2006. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what MCMAHAN 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 1,004 prescription claims written by this provider, covering 241 Medicare beneficiaries and totaling roughly $31K in drug spend, split 2% brand-name and 98% generic by claim count. 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 63.8038/100 for the 2023 performance year (Quality 55.9047, Cost 32.608), compared with the national average of 83.1.

Otolaryngic Allergy Physician is a narrow specialty nationwide, with 151 enrolled providers across 38 states and an average of 788 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.