I'm going to ask you to consider that all rights must be mutual and both parties must have the ability to grant the other party said right. If you are not a doctor then you do not have the ability to grant a mutual right of medical care.
Like I pointed out in the right to food debate: can two people who have no food enter a contract that grants each other the right to food? This this right to food exist by virtue of them being human? Do they have this right in the desert?
Would you sign a contract that grants me a right to food whether or not I provide you food or compensation? Would you open that contract up to anyone who wanted to sign it with you?