I would contact your employer's HR department and see what paperwork would be needed to fill out. Often times there are enrollment periods during the year so you may have to wait until there is one to add her on.
Congrats on the upcoming marriage! You probably just need to complete a form with her information to have her added. There are usually enrollment periods that limit when you can enter the plan; however, there are also usually "qualifying event" provisions where you can add a person even if it is outside of the normal enrollment periods (for example, if you get married or have a child, you usually have up to about 60 days to add another person following the event - i.e. marriage, birth, etc.). For example, when I got married in October 2011, I was able to add my wife to my company-provided insurance immediately. The only delaying factor was waiting for confirmation of her name change so that the application was accurate. Other than that, it was a pretty painless process. Your best bet is probably to contact HR and ask them what needs to be done following the marriage to add your new spouse.
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