| I checked with someone at a new client of mine that advocates for people with disabilities. She said that diabetics are covered under the Americans with Disabilities Act. If you can fulfill the core tasks of your job, even with accommodations that they are required to make, they cannot legally fire you for being diabetic. You don't have to disclose to the employer; you do have to disclose to the insurer if there is insurance, because there may be pre-existing conditions clauses in the plan. I didn't ask about the insurer telling the employer, but I'm also fairly sure, as others here have said, that it would be a violation of HIPAA for them to disclose to the employer.
If anyone thinks they've been discriminated against about this, she says, they should talk to a lawyer who knows something about disability rights, which is probably a pretty small group but they exist.
Those group physicals sound godawful, Hammer. There's probably something illegal about them, but I haven't a clue what. | 
