The visa exemption is for tourist purposes only, not surgery. You could apply for a tourist visa but I don’t see the point in paying for a visa when you can get in the country for free.
You are also required to quarantine in a hospital when applying for the tourist visa.
I’m having cosmetic surgery in July and you don’t need to apply for a visa if you’re country is apart of the visa exemption scheme. Be sure not to mention anything about surgery.