+1(514) 937-9445 or Toll-free (Canada & US) +1 (888) 947-9445
I know this is an old thread but,

Do we need to update Service Ontario regarding OHIP coverage at all, after becoming a citizen ? (specifically - 'change of information form' to update immigration status to 'citizen') - or equivalent if in a different province.

On searching online, I did not find a concrete answer, but i found a link to a form for 'change of information', where one of the sections relates to immigration/citizenship status : https://forms.mgcs.gov.on.ca/en/dataset/014-0280-82