In general, it is not necessary to get a new personal health number as the risk to customers is low.
In Ontario, if you have received a new OHIP card after January 2016, it is not necessary to get a new personal health number, but protections are available for concerned customers by contacting Service Ontario at 1-800-664-8988. If your OHIP card was issued prior to 2016 and you are concerned, please contact Service Ontario to issue a replacement.
In British Columbia, the Ministry of Health has advised LifeLabs that personal health numbers (PHNs) are not reassigned as a matter of practice, but additional protection can be added to your account by calling Health Insurance BC at 604 683-7151 or toll-free at 1 800 663-7100.