Having government regulations doesn't make something not capitalist. Capitalism is defined by an economic system where you can profit off of simply owning Capital (i.e. the means of production) without having to work it.

Per Wikipedia:

> Capitalism is an economic system based on the private ownership of the means of production and their operation for profit. Central characteristics of capitalism include capital accumulation, competitive markets, price system, private property, property rights recognition, voluntary exchange, and wage labor.

All of these things are true of the US healthcare market.