To avoid misunderstanding, tell me the exact website you used to apply to the job and what position. I was thinking it was IBM the big IT/computer company... but on the other hand, IBM does have a Healthcare business unit.

A company can hire someone as their employee and then assign him/her to work at their customer location.

If this is what you are having now, it could mean that you are going to be working on something important and IBM need you under their company rules and policies.