I came to France on a passport-talent visa. How to get maternity insurance on long stay visa (Passport talent Researcher) in France immediately?
If you are working in France, your employer, or you (depending on the situation), have registered you to the mandatory Assurance Maladie Social Security scheme, as soon as you start working, which in turn has assigned you, a 15 digits NIR (Numéro d'inscription au registre INSEE more commonly known as a numéro de sécurité sociale (SSN))
This number certified that you are covered under the social security scheme, which will allow you to access public healthcare and some reimbursement for your health fees (You need to also apply for the Social Security Card, the Carte Vitale).
Now, it isn't full reimbursement for everything, and you may want to get under a mutuelle complémentaire (complementary health insurance) for extra coverage.
If you are in the private sector, your employer is required to allow you to subscribe directly (while it will be paid by you) or you can choose it yoursely