Bob, here's a link to a recent review of ten photo organizing software offerings that are affordable. A quick check of the specs looks like all of them have some minimal image adjustment features. It may be tough to find consumer oriented image organizing software with no adjustment features at all, that strikes me as a product with very limited appeal. Why is the office so set on having no adjustment features? Fear of employees mucking up the data base perhaps? I hope that their office is performing regular data backups, depending on one hard drive means it's a matter of when, not if, they lose data. If they are backing up their image files, they will have a fall back catalog in case an employee does adjust something that shouldn't have been touched.
One other possibility that might possibly be adapted to their needs is "Stockview" offered by Hindsight ltd. This is primarily oriented to professional management of image libraries such as a stock photography agency might have, but might serve a medical office as well. It is $200, so price is getting up there. However, no image manipulation features are offered with Stockview (other than resizing,) so take that into consideration. Hindsight also offers a cool program, "Metamachine," for adding metadata to image files, that might also be of use to them, depending on what strategfy they eventually adopt.
http://www.hindsightltd.com/