Worried, I was, when I heard news that the older red and white OHIP cards are now invalid. This is not true. If you received a notice from OHIP that you need to renew, then do so. Otherwise there are no worries.
If you are not sure, then call the ServiceOntario INFOline at 1-866-532-3161 and ask. You may have to wait a bit, so use your phone’s headset. They will search your card number and tell you. Red and white cards are still valid.
I am an emergency room registration clerk.