Ryoko Hamaguchi appears in the CMS NPPES registry as a Student in an Organized Health Care Education/Training Program provider at 75 FRANCIS ST, Boston, MA, 02115, with a listed phone of (617) 732-4840. NPI 1679150205 was issued on 03/28/2021. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what Hamaguchi 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 43 prescription claims written by this provider, covering 25 Medicare beneficiaries and totaling roughly $567 in drug spend, with an opioid prescribing rate of 44.2%. 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.

Student in an Organized Health Care Education/Training Program is a high-volume specialty nationwide, with 331,761 enrolled providers across 55 states and an average of 459 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.