Healthcare expenses tool Simplee has attracted American Express to a $20m series C round that almost doubled its total funding to $38m.

US-based healthcare expenses management platform Simplee has raised $20m in a series C round that included American Express Ventures, the investment arm of payment services firm American Express, Globes reported yesterday.

The round was led by venture capital firm Social Capital, while 83North and Heritage Group also participated.

Founded in 2011, Simplee’s platform helps healthcare providers estimate and issue bills to patients, who can clearly see which services and procedures for which they are paying.

The company currently works with…