CNS is one of the best thing in Luxembourg.

CNS is one of the best thing in Luxembourg.
Doctors, hospital and medicine bills are very well covered, similar to what I used to have from the equivalent French public service + additional private insurance (15 years ago and I guess it did not improve since) for a fraction of the cost. Reimbursements are pretty fast for local expenses. I've had good experience with staff at the counter and as well over the phone, though obviously sometimes the waiting time may be long.
No need to fill any form, just post the invoice to CNS and it's done, 5 weeks letter your bank account is credited. The cherry on the cake is that it is stamp-free :)