Comment by supermatt

You must be mistaken…

The maximum personal contribution to public health insurance (GKV) is capped at around 400/m for healthcare (and an additional 200 towards long-term/elderly care). Spouse and children are free if they are unemployed.

https://www.tk.de/resource/blob/2189790/9321e565c304a9cc33bb...

If you are paying more than that then you are already paying for private health insurance (PKV) or private supplementation on top of GKV for some premium coverage.