MARK CASTANAGA, NURSE PRACTITIONER appears in the CMS NPPES registry as a Nurse Practitioner provider holding NURSE PRACTITIONER credentials at 8116 LAS VEGAS BLVD S, LAS VEGAS, NV, 89123, with a listed phone of (702) 407-7063. NPI 1114652765 was issued on 07/19/2022. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what CASTANAGA 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 109 prescription claims written by this provider, covering 80 Medicare beneficiaries and totaling roughly $2K in drug spend, split 14% brand-name and 86% 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. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 84.6157/100 for the 2023 performance year (Quality 74.1682, Cost 96.0774), compared with the national average of 83.1.

Nurse Practitioner is a high-volume specialty nationwide, with 87,227 enrolled providers across 56 states and an average of 1,084 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.