Hello Barrie,
The appointment is not necessary to process your application.
You can find your CPAM's address on our website ameli.fr, in "Adresses et Contacts".
If you have not yet applied for a social security number, I invite you to read this article on our website, ameli.fr: "Formulas to follow depending upon your situation".
To know how to be covered by the French healthcare system, I advise you to read this answer, available on the forum: "New to France - Healthcare?".
You have to send your application by post.
I wish you a good day.
