Up to 70% of hospital charges are reimbursed by the French Social Security or la Securité Sociale, but costs for your hospital stay or forfait journalier are not, which is where mutual health fund or mutuelle santé and supplementary insurance can be used to cover full hospitalization costs.
The healthcare system in France is accessible, even for foreigners, although you will be typically asked to show proof of French health insurance card – la carte Vitale or a social security certificate – une attestation de securité sociale such as : AME, CMU-C, ACS, MSA or Mutuelle Santé. For European Union citizens, they must present their European Health Insurance Card (EHIC), while non-EU visitors are required to show proof of medical insurance along with their French visa.