NHI Reimbursment?

Hi everyone, simple question.

Does NHI reimburse you for medical expenses incurred 6 months before your insurance goes into effect?

Tealit said yes a few years ago: tealit.com/article_categorie … -insurance

But I called and NHI said no. Maybe they used to, but don’t anymore. Does anyone know? And if they do, what is the evidence?