Japan on Tuesday fully transitioned to a system that integrates health insurance card functions into the My Number identification cards, even as challenges remain in expanding its use.While existing insurance cards expired Monday, they can still be used at medical facilities until the end of March next year to avoid confusion, with holders continuing to pay the usual 10 to 30 percent of medical costs.Meanwhile, those who do not have My Number cards can still receive insured care if they show a certificate proving their enrollment in health insurance.According to the Ministry of Health, Labo…READ FULL ARTICLE