If you aren't rejecting some treatments, you aren't controlling healthcare costs. A drug or device must be safe and effective to gain market authorisation, but the threshold of efficacy is statistical significance rather than clinical significance. Many drugs and devices on the market are almost useless - not actually useless, but very nearly so.

The usual examples of controlling care costs are stupendously expensive novel treatments for rare and serious diseases, but an equally serious problem is marginally effective or ineffective treatments for common complaints.

https://en.wikipedia.org/wiki/NHS_treatments_blacklist