Technically yes, as you'd be affecting their life without them having a choice.
Informed consent is important.

Imagine someone was ready to pass on, had achieved everything they wanted to in life, had a disease and were content to die from that.
Then you come along and heal them.

So it's case by case. :)

Personally; I'd like a particular physical ailment of mine healed, but I'd like to know details of how and what to expect afterward, etc.

Manufacturing consent is also rife in certain areas nowadays, that's a shit thing to do.