MARIA CRESELDA DE LEON, MD appears in the CMS NPPES registry as a Gynecologic Oncology Physician provider holding MD credentials at 23823 VALENCIA BLVD STE 250, SANTA CLARITA, CA, 91355, with a listed phone of (661) 799-1999. NPI 1073773073 was issued on 06/12/2008. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what DE LEON 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 207 prescription claims written by this provider, covering 84 Medicare beneficiaries and totaling roughly $4K in drug spend, split 5% brand-name and 95% generic by claim count, with an opioid prescribing rate of 29.5%. 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 99.1275/100 for the 2023 performance year (Quality 85.2396), compared with the national average of 83.1.

Gynecologic Oncology Physician is a narrow specialty nationwide, with 1,360 enrolled providers across 49 states and an average of 188 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.