Just wanted to add my 2 cents for those who are/will be on PGWP, are in Ontario, and need OHIP.
You don't get OHIP unless you have a job in Ontario.
Once you have one you can immediately apply for OHIP but the card would only arrive after 90 days you have been in that job.
You can change any number of jobs, there is no issue (you can be jobless after you get ohip).
How to apply for OHIP on PGWP:
1. Need Work Permit
2. Passport
3. Address proof of Ontario, example driving licence.
4. Employment letter - This needs to be hand-signed letter stating your occupation, job location, start date and end dates (if any). Clearly stating that job is at least for 6 months, or ends at work permit expiry or simply that there is no end date and that its permanent etc.
The difficult part is that you can ONLY GOTO FULL SERVICEONTARIO CENTRES". These are the ones that work Mon-Fri 9-5 only. Those others that are open on Thursday till late and also on weekends don't entertain for PGWP getting OHIP, don't waste your time going there.
I hope that helps.