JOHN SEBASTIANELLI, MD appears in the CMS NPPES registry as a Prescribing (Medical) Psychologist provider holding MD credentials at 76 SUMMER ST, HAVERHILL, MA, 01830, with a listed phone of (781) 373-8222. NPI 1548308927 was issued on 02/01/2007. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what SEBASTIANELLI 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 290 prescription claims written by this provider, covering 44 Medicare beneficiaries and totaling roughly $32K in drug spend, split 9% brand-name and 91% 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.

Prescribing (Medical) Psychologist is a narrow specialty nationwide, with 225 enrolled providers across 42 states and an average of 972 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.