That's the case for the medical info chips (which I don't think have actually been launched yet), but I don't see any indication that it's the case for the chips these employees have gotten.
It is the case for the NAIS chips. If it is the same Verisign database, I don't see why they would have a difference.
It's the same chip for both the medical and identification / secure access applications. Those who receive the chip for the later will be able to opt into the medical database if they wish, when it becomes available in their area.