- It's priced according to income, not health condition
- You will never, ever be refused necessary healthcare, and you'll know it's covered before work begins
- You are not punished for using your insurance, and the premiums won't change
- There is no deductible, except a 5-10€/month co-pay for prescriptions
- Your employer/employment has no impact on your coverage, or the insurer you choose
This is for the public system. The private system is a bit more complicated, but generally, the same rules apply. The only difference is the pricing structure, and the possibility of having a deductible (usually ~1000€/year).
American expats tend to have trauma that affects their insurance choices. My job is to reassure them that our system is completely unlike the American system.
If you want a plain English overview of the system, you can have a look here: https://allaboutberlin.com/guides/german-health-insurance