Improper medication reconciliation can result in inaccurate medication lists. When medication lists are inaccurate, it can result in drug-drug interactions, dosing errors, and medication duplication. Interventions targeting medication reconciliation have had varying levels of success. This study aimed to describe the medication reconciliation educational program, its implementation in a health care system, pharmacist and clinic personnel perception of the program, and its impact on clinic personnel knowledge and practice. Guided by the Conceptual Model of Implementation Research, a partially mixed sequential dominant status evaluation of a pharmacist-led educational program on evidence-based practices for medication reconciliation implemented into all primary care clinic sites by examining implementation outcomes was conducted. The implementation outcomes measured include penetration, fidelity, acceptability, appropriateness, feasibility, and adoption. Data were collected through program data and direct observations, pre- and postsurveys, and semistructured interviews of pharmacists and clinic personnel. Of 46 primary care sites, 37 primary care sites (80%) implemented the pharmacist-delivered medication reconciliation education from April to June 2021 with representation from each of Geisinger's regions. Ten clinic sites (27%) completed the medication reconciliation educational program as originally designed, with the remainder adapting the program. A total of 296 clinic personnel completed the presurvey, and 178 completed the postsurvey. There were no differences in baseline characteristics between clinic personnel who completed the pre- versus postsurvey. All clinic personnel interviewed felt satisfied with the educational program and felt it was appropriate because it directly affected their job. Clinic personnel felt the educational program was acceptable and appropriate; two major concerns were discussed: a lack of patient knowledge about their medications and a lack of time to complete the medication reconciliation. The adherence rate to the elements of the medication reconciliation that were covered in the education program ranged from 0% to 95% in the 55 observations conducted. An educational program for medication reconciliation was found to be acceptable and appropriate but was often adapted to fit site-specific needs. Additional barriers affected adoption of best practices and should be addressed in future studies.