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Background According to the Centers for Disease Control (CDC), PrEP coverage in the United States was approximately 18% in 2018 and 21.9% in California. We predict that PrEP prescription is lower at Harbor-UCLA Medical Center (HUMC) and affiliated clinics within Los Angeles County Department of Health Services. Methods A retrospective chart review of HIV-negative patients with ICD-10 coded diagnoses of sexually transmitted infections (STIs) or high-risk sexual behavior was performed across various medical specialties at HUMC and affiliated clinics in 2018. Documentation of sexual behavior risk reduction counseling, PrEP discussion and prescription was reviewed from electronic medical records for each encounter. Descriptive statistics and analysis were completed in STATA Version 16.1, StataCorp LLC. Results The sample included 250 individual patients, all with indications for PrEP. Of those, 47.2% identified as Latinx and 27.2% Black. Table 1 shows 74% of patients identified as heterosexual whereas 9.2% identified as gay, and 4.4% bisexual. Of the 250 individual patients, 87 (34.8%) returned for a 2nd visit, 35 (14.0%) for a third, and 9 (3.6%) for a 4th visit, for a total of 381 encounters. Of the total encounters, 49.3% had sexual behavior risk reduction counseling, 7.3% had discussions about PrEP with their provider, and only 2.1% were newly prescribed PrEP (Table 2). Of the 2.1% new PrEP prescriptions, 1.8% were prescribed by family medicine providers with no new prescriptions by OB/GYN or acute care providers. Only 25% of new PrEP prescriptions were female patients. A positive test for an STI occurred in 45.1% of total encounters while high risk sexual behavior was identified in 54.9% of encounters (Table 3). Table 1: First Encounter Demographics (N=250 Individual Patients) Table 2: Primary Outcomes by Specialty (N=381 Total Encounters) Table 3: Sexually Transmitted Infections Frequency (N=381 Total Encounters) Conclusion Our findings demonstrate that the percent of individuals newly prescribed PrEP (2.1%) at HUMC and affiliated clinics is less than that reported nationally and in California. This suggests that municipal health systems fall short in PrEP usage, notably for structurally vulnerable populations such as racial minorities as well as heterosexual females. Ending racial/ethnic disparities in HIV and in PrEP coverage not only requires educating specialty providers on PrEP, but also addressing structural racism and identifying structural barriers to care in vulnerable communities. Disclosures All Authors: No reported disclosures

997. The Purview Paradox: PrEP Utilization at a Major Southern California County Teaching Hospital and Affiliated Clinics