BackgroundDespite therapeutic advances, treatment-experienced HIV patients can present a clinical challenge, even to experienced care providers.Table. Assessment of Educational EffectivenessMethodsThis study assessed the ability of digital education to improve HIV/ID specialists’ ability to develop tailored strategies for treatment-experienced patients. A CME/ABIM MOC/CE-certified, case-based, educational program was developed. Modeled after the interactive grand rounds approach, a “test then teach” strategy with multiple choice questions was used to elicit cognitive dissonance. Evidence-based feedback was provided following each response. Educational effectiveness was assessed with a repeated-pairs pre-/post-assessment study design; each individual served as his/her own control. A chi-square test assessed changes pre- to post-assessment. P values < 0.05 are statistically significant. Effect sizes were evaluated using Cramer’s V (< 0.05 modest; 0.06-0.15 noticeable effect; 0.16-0.26 considerable effect; > 0.26 extensive effect). The activity launched on a website dedicated to continuous professional development on 09/12/19. Data for this matched-learner analysis were collected through 11/06/19.ResultsTo date, 14,181 HCPs (3128 physicians; 9518 nurses/NPs; 333 PAs; 172 pharmacists) have participated in the activity. Data from the subset of HIV/ID specialists (n=110) who answered all pre-/post-assessment questions during the initial study period were analyzed. Following activity participation, significant improvements were observed in the proportion of HIV/ID specialists who answered all assessment questions correctly (15% pre vs 81% post; P < .0001; V=.356). Improvements were also observed in several specific areas of assessment (Table). Additionally, 44% of HIV/ID specialists indicated they planned to modify their treatment approach for treatment experience patients because of participating in the education.Of note, this assessment also identified topics in which HIV/ID had a high degree of baseline knowledge.ConclusionParticipation in this online, interactive, case-based, program significantly improved HIV/ID specialists’ ability to develop individualized care strategies for patients who are treatment experienced. Disclosures All Authors: No reported disclosures