RACHEL MASON, M.D. appears in the CMS NPPES registry as a Geriatric Medicine (Internal Medicine) Physician provider holding M.D. credentials at 3901 RAINBOW BLVD, 6040 DELP, MS 1020, KANSAS CITY, KS, 66160, with a listed phone of (913) 588-3974. NPI 1619105467 was issued on 06/30/2009. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what MASON 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 20,943 prescription claims written by this provider, covering 724 Medicare beneficiaries and totaling roughly $1.3 million in drug spend, split 14% brand-name and 86% generic by claim count, with an opioid prescribing rate of 4.3%. 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.

Geriatric Medicine (Internal Medicine) Physician is a narrow specialty nationwide, with 4,161 enrolled providers across 52 states and an average of 4,450 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.