Usually, the definition includes the government determining what (basic) insurance covers and what price the insurers pay to the hospitals. Those two things are missing in ACA/Obamacare.

For example in The Netherlands, the government defines a extensive healthcare package that every insurer must provide to everyone, insurers must accept everyone for and all their clients must pay the same price, and they also determine what hospitals can charge for certain procedures. "Add-ons" like sport-related Physical Therapy are mostly unregulated.

That's far more far-reaching than Obamacare, which allows age-based price discrimination, only mandates coverage of 10 categories and does not regulate hospital pricing.