If you are not married to your significant other or are in a same sex relationship, you should consider having a Hospital Visitation Authorization.
This is because many hospitals permit only family members to visit their loved ones in a hospital. Certainly some hospitals enforce this more strictly than others, it is wise to have a Visitation Authorization in place.
Thus, to ensure that you and your partner are able to visit each other during a hospital stay, both partners should execute a Hospital Visitation Authorization.
I recommend that my unmarried clients have one available in case they need to show it to hospital personnel before being allowed to visit your significant other.