Very approximately, Americans spends about 20% of their GDP on healthcare. Britain spends about 10%. Singapore spends about 5%. (Those numbers include both government spending, like on the NHS or US Medicare and private spending.)

The NHS looks good compared to the broken American system. But it's a spendthrift compared to Singapore.

Healthcare outcomes in Singapore are no worse than in the US or UK.

See https://en.wikipedia.org/wiki/Healthcare_in_Singapore for more information.