President Donald Trump's briefing statement released by the White House confirms that he incorrectly stated this while addressing the nation.
According to the briefing released by the White House, Donald Trump stated in his address to the nation that the health insurance industry has agreed to waive patient co-payments for treatment of COVID-19. The industry has not made such a commitment. Instead, insurance companies agreed to cover the full cost of diagnostic tests to see whether people have the disease. That step does not shield insured people from potentially high medical bills as a result of getting sick from the coronavirus.
The COVID-19 pandemic has given rise to a lot of potentially dangerous misinformation. For reliable advice on COVID-19 including symptoms, prevention and available treatment, please refer to the World Health Organisation or your national healthcare authority.