NAIA MCMILLAN-CASTANARES appears in the CMS NPPES registry as a Pediatric Sleep Medicine Physician provider at 1500 E MEDICAL CENTER DR, ANN ARBOR, MI, 48109, with a listed phone of (734) 936-9068. NPI 1558931196 was issued on 06/27/2021. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what MCMILLAN-CASTANARES 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 300 prescription claims written by this provider, covering 23 Medicare beneficiaries and totaling roughly $20K in drug spend. 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.

Pediatric Sleep Medicine Physician is a narrow specialty nationwide, with 99 enrolled providers across 30 states and an average of 357 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.