The study employed a retrospective descriptive design, utilizing data from the health insurancereports at a district hospital in the Southern Vietnam (District AB), which was characterized bylarge urban remoteness, covering the years 2018, 2019 and 2020. The dataset included 352,881patients during the outbreak period. Additionally, data were gathered from a Northern regionhospital (District TO), located in the suburbs of a major urban area, spanning 5 years from 2019 to2023, with a database of 411,189 patients recorded at the end of 2020 and the again in April 2022.The findings indicate that:(1) The overall disease structure according to 22 disease chapters in bothhospitals, remained relatively stable, with minimal impact from the pandemic. District TO's suburbanhospitals showed an increase in chapters IX and XI
(2) there were notable fluctuations in diseasepatterns in both inpatient and outpatient settings the Covid-19 epidemic. Specifically, the numberof outpatients increased during the outbreak, while inpatients admissions significantly decreased.At AB hospital, outpatient visits surged in 2020 while inpatient admissions saw a steep decline,particularly among the top 10. The sharpest decrease reduction was observed in musculoskeletaland joint disorders. Three conditions experienced substantial decreases: gastroduodenitis (K29)fell by more than tenfold, from 6,269 cases to 607
asthma (J45) and atopic dermatitis (L20) alsosaw reductions of over 50%. At TO Hospital, the annual number of inpatients was relatively low,making the impact of the epidemic less apparent. Conclusions: The structure of the disease chaptersaccording to ICD-10 remained largely unchanged throughout the study period. The Covid-19epidemic led to a reduction the top 10 diseases among inpatients while increasing the volume ofoutpatients. Many conditions saw sharp declines in both outpatients and inpatients categories.