Amaris Keiser, M.D. appears in the CMS NPPES registry as a Neonatal-Perinatal Medicine Physician provider holding M.D. credentials at 5 PERRYRIDGE RD, Greenwich, CT, 06830, with a listed phone of (203) 863-3513. NPI 1427376466 was issued on 05/14/2010. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what Keiser 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 prescribing data is not currently published for this NPI, which typically means the provider either wrote fewer than 11 Part D claims in the most recent reporting year, does not participate in Medicare, or practices in a specialty that rarely prescribes outpatient drugs. Absence of prescribing data is not a quality signal, many Neonatal-Perinatal Medicine Physician providers operate outside Part D entirely. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 74.4/100 for the 2023 performance year (Quality 64.7, Cost 52.4), compared with the national average of 83.1.

Neonatal-Perinatal Medicine Physician is a mid-sized specialty nationwide, with 5,589 enrolled providers across 52 states and an average of 56 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.