Addressing the Asian Development Bank's (ADB) annual meeting, Aso underscored the need to support health systems to cope with infectious diseases such as COVID-19 as well as other illness.
Promoting universal health coverage will help reinforce health systems to prevent future pandemics, ensuring inclusive and sustainable economic growth in the region with ageing populations, Aso said.
"We clarified in written form the G20 nations' thinking on currency rates. It's a clarification, not a change, in our stance," Aso told reporters on Wednesday.
Aso was speaking after attending a virtual meeting of leaders from the G20 major economies, held on the sidelines of IMF/World Bank spring meetings.
In a phone call with Japanese Finance Minister and Deputy Prime Minister, Yellen emphasized her readiness to work closely with Japan, both bilaterally and multilaterally.
Speaking after his first talks with Yellen since she became the new US Treasury Secretary, Aso said they had also agreed that it was important to hold close discussions on foreign exchange rates.
We reaffirmed that it's important to maintain G7 (Group of Seven) as well as G20 (Group of 20) agreements of up until now.
Yellen last month said the value of the dollar should be determined by markets, a break from departing President Donald Trump's desire for a weaker US currency.