Residence and physical presence[1]
Ontario must be your primary home. General rules require presence for at least 153 days in any 12-month period and 153 of the first 183 days after establishing residence. Exceptions need individual assessment.

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ServiceOntario / OHIP / Free preparation
OHIP is Ontario’s public health insurance. Prepare your application and visit here; ServiceOntario decides whether you qualify.
WHO THIS GUIDE IS FOR
First OHIP application: an adult permanent resident applying for themselves and living in Ontario. This edition does not cover children, renewals or other immigration categories.
Students, temporary workers, visitors, protected persons and people applying for someone else need their own requirements. This route does not establish those requirements; do not confirm a category that does not fit.
Ontario must be your primary home. General rules require presence for at least 153 days in any 12-month period and 153 of the first 183 days after establishing residence. Exceptions need individual assessment.
The presence rule is not a waiting period before making an application. Eligible applicants have no coverage waiting period. Discuss planned absences or special circumstances with ServiceOntario.
A first application is made in person at ServiceOntario. Prepare three separate documents and form 0265-82. Finishing this guide does not activate coverage.
References support what you read here. You do not need to open them to complete the preparation steps.