JI WON AHN, MD appears in the CMS NPPES registry as a MOHS-Micrographic Surgery Physician provider holding MD credentials at 320 LENNON LN DEPT OF, WALNUT CREEK, CA, 94598, with a listed phone of (925) 817-5678. NPI 1023460243 was issued on 07/12/2016. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what AHN 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 390 prescription claims written by this provider, covering 214 Medicare beneficiaries and totaling roughly $21K in drug spend, with an opioid prescribing rate of 5.4%. 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 77.5068/100 for the 2023 performance year (Quality 68.6144, Cost 56.4081), compared with the national average of 83.1.

MOHS-Micrographic Surgery Physician is a narrow specialty nationwide, with 1,102 enrolled providers across 52 states and an average of 607 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.