What diseases cost the most money in the nineties

The most expensive diseases to treat in the 1990s were digestive diseases. The top five diseases that cost the most to treat in the nineties are digestive diseases, respiratory diseases, circulatory diseases, injuries, poisoning and some other consequences of external causes, and tumors. 90's a decade ago, doctors relied on a wealth of diagnostic experience to treat diseases, and medical equipment in the past was not as good as it is now, and there is not as much high-tech equipment.