Robert Grumbach, M.D. appears in the CMS NPPES registry as a Specialist provider holding M.D. credentials at 222 HERLONG AVE S, Rock Hill, SC, 29732, with a listed phone of (803) 329-1234. NPI 1881664795 was issued on 01/24/2006.

Medicare Part D records for calendar year 2023 show 490 prescription claims written by this provider, covering 106 Medicare beneficiaries and totaling roughly $34K in drug spend, split 15% brand-name and 85% generic by claim count. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 83/100 for the 2023 performance year (Quality 80.5, Cost 72.2), compared with the national average of 83.1.

Specialist is a high-volume specialty nationwide, with 69,608 enrolled providers across 55 states and an average of 1,474 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.