Good evening Samantha,
I'm Doug, and I'm sorry to hear of the confusion. My goal is to provide you with excellent service today.
Under NY law, as with all other states as well, a step-parent has no legal ability to provide legal consent for the medical treatment of a step-child absent specific written authorization from one or both parents, or an order of the court.
In an emergency situation however, the hospital may provide life supporting emergency care for a minor without first obtaining consent from anyone. And in this manner it might look as though a step-parent has given consent for treatment, but in fact this is not the case.
But as a general rule, no a step-parent may not legally give consent for treatment of a step-child.
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I wish you and yours the best in 2016,