One of the reasons they may not want to give the information on where he is housed is because he is in a hospital, and they don't want people showing up there to try to contact your husband.
Getting current medical infomation on your husband might be difficult when dealing with the jail, since most officers don't deal with such things, or don't feel inclined to help the public with such calls. I don't think that's a great way to handle things, but some officers just don't deal well with the public.
I'm not sure about the jail system in Maryland, but in California many of the jails have groups like "Friends Outside". Such groups help inmates and their families with questions and needs, like reading glasses and legal information. If such a group works with the jail your husband is in, they'd most likely have the ability to check on your husband's status, especially since they know who to talk to.
Also, just about every jail has a Chaplaincy, and they have a great deal of access to infomation as well. They might be an easier route for you to take. The phone book might even list their number within the jail.
Hope that helps.