Just wanted to point out that anyone with a Greek AFM and a permanent address in Greece will be able to join a health plan, even if the stay in Greece is temporary (i.e. 3-6 months).
These plans range form the simple basic ones, like the ones required for residence permit purposes, to comprehensive insurance plans offering cover for many thousand of Euros among other covers.
For more info on residence permit insurance plans you can have a look here:https://insurance-greece.com/insurance- ... insurance/
For general tips and things you should be careful of, you can have a look here:https://insurance-greece.com/insurance- ... insurance/
For more personalised advice you can reach me on my email firstname.lastname@example.org