This is the 789th most frequent Croatian word.
zdravstvena
"Zdravstvena" means "health" or "health-related" in English.
Here, 'zdravstvenoj' is the locative form of the feminine adjective, agreeing with the noun 'ustanovi' which denotes a location.
Radim u zdravstvenoj ustanovi u gradu.
I work in a health institution in the city.
Here, 'zdravstvena' is an adjective modifying the noun 'skrb', indicating that the type of care discussed is related to health.
Zdravstvena skrb je važna za sve građane.
Health care is important for all citizens.
In this sentence, 'zdravstvenu' is the accusative form of the feminine adjective, agreeing with the direct object noun 'osiguranje'.