I don’t know much about the Mexican healthcare system, so I can’t make direct comparisons. However, one key aspect of the Danish system is its transparency. Everything is above board, with patients fully informed about their treatments, and the departments paying the bills having full visibility into the processes.
Additionally, under-the-table payments are nearly impossible in Denmark. Most monetary transactions are electronic, and if someone tries to deposit more than $1,000 in cash at a bank, the bank is legally required to ask about the source of the money. This is part of strict laws designed to combat "dark money" and ensure financial accountability.