MARCIA CASAS, M.D. appears in the CMS NPPES registry as a Emergency Medicine Physician provider holding M.D. credentials at 6501 COYLE AVE, CARMICHAEL, CA, 95608, with a listed phone of (916) 537-5000. NPI 1902946072 was issued on 02/07/2007. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what CASAS 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 262 prescription claims written by this provider, covering 166 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 19.5%. 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.

Emergency Medicine Physician is a high-volume specialty nationwide, with 64,398 enrolled providers across 56 states and an average of 352 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.