I agree that a horizontal bar chart would be a good way to display a ranked variable. I think the reader would easily understand the top to bottom ranking system and it would mimic score charts and other ranked tables and charts that we see. However, sorting the bars according to the values would be key to this graph. If the service categories appeared in alphabetical or some other order, then it wouldn’t be as clear to the reader.
Both zones would have the same service category as their most frequent claim type, curative care visits. The Northern zone has more (1110) than the Eastern zone (987), but they are the most frequent claims for both areas. The least frequent service category in the Northern zone is speech therapy (1), while in the Eastern zone it is both inpatient obstetrics (2) and inpatient medical (2).