P-562. Tracking the Increase: Diagnostic Trends in Infectious Disease Among New Patients at a Large Urban Safety Net Health System, New York City (NYC) 2021-2023

Abstract Background NYC Health + Hospitals (H+H), the nation’s largest municipal health system, provides healthcare to a large proportion of uninsured and socially vulnerable persons, including those newly arrived to the city. Diagnostic trends among new H+H patients can reveal insights in emerging demands on primary and specialty healthcare services. We aim to describe recent trends in infectious disease diagnoses among patients who recently initiated care at H+H.Table 1:Characteristics of annual cohorts of patients new to NYC Health + Hospitals, New York City 2021-2023Table 2a:Frequency of infectious diseases diagnoses (by ICD-10-CM codes) made in the 12 months after new engagement with NYC Health + Hospitals, New York City 2021-2023Overall cohort Methods We included three cohorts of patients with first-time visits to H+H in 2021, 2022, or 2023, respectively. Index medical visits were identified using 2017-2023 records from H+H’s electronic health record (EHR). We identified patients with a subset of infectious disease diagnoses, using International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) codes, including EHR billing and visit diagnoses, within 12 months of each patient’s index visit. We compared patient characteristics and odds ratios of infectious diseases diagnoses between the 2023 and 2021 cohorts.Table 2b:Frequency of infectious diseases diagnoses (by ICD-10-CM codes) made in the 12 months after new engagement with NYC Health + Hospitals, New York City 2021-2023Cohort aged