I have registered and applied for my status "S", and waiting for my card:
You can take an appointment at a hospital or with a medical practitioner. It is mandatory in your case to present your national ID or passport, and documents from an immigration authorities, confirming that you have filed an application to the status "S".
I have not registered yet and need an urgent medical help:
Please contact cantonal immigration authorities in order to request a support.
You can as well go to an urgency services of a hospital near to you.