Just a quick follow up to my last post, to give an idea how long these things take. I paid the bill for the treatment on a Friday and had the payment back from CPAM into my bank account the following Thursday.
The balance due from the insurance of 250 euros ( the maximum allowed under my plan ) was repaid into my bank 4 days later.
This is pretty consistent with other repayments with the CPAM payment always coming first. Both payments come automatically after showing my Carte Vitale card which is linked electronically to my insurance policy.