Medicare and medicaid are as a much a gift of revenue for the healthcare industry as it is socialized medicine.
The incentives align well -- people get healthcare for free and and healthcare service provider gets a nice, fat government check.
That's why we don't do preventive care -- our current sick care model is much more profitable.
There are a lot of misaligned incentives in the US healthcare system, but Medicare and Medicaid health plans generally offer similar preventive care benefits as commercial plans.
https://www.healthcare.gov/preventive-care-adults/
https://www.medicare.gov/coverage/preventive-screening-servi...
It's not healthcare mostly, it's medical care.
Otherwise we would tax added sugar out to wazoo and use it to pay gym memberships.