DANIEL CALLAHAN, MD appears in the CMS NPPES registry as a Pain Medicine (Psychiatry & Neurology) Physician provider holding MD credentials at 2120 N SECTION ST, SULLIVAN, IN, 47882, with a listed phone of (812) 268-2556. NPI 1255580593 was issued on 09/11/2008. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what CALLAHAN 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 3,080 prescription claims written by this provider, covering 574 Medicare beneficiaries and totaling roughly $106K in drug spend, split 5% brand-name and 95% generic by claim count, with an opioid prescribing rate of 53.2%. 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.

Pain Medicine (Psychiatry & Neurology) Physician is a narrow specialty nationwide, with 161 enrolled providers across 39 states and an average of 1,690 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.