Could be wrong but I have a feeling that most of the other costs are related to either mitigating or fighting malpractice lawsuits. Do any other countries have a lot of medical malpractice lawsuits besides the US?
You would be wrong. We have a natural experiment in that some US states have imposed caps on malpractice damages, yet they have experienced only slight decreases in overall medical costs.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3048809/