| Unless you are in a job where having diabetes could put someone at risk, I wouldn't think you'd have to tell your employer. I don't think i've ever heard the docs or managers share any medical information with us and really if its controlled, its no one's business. If you are apt to have hypos or other problems related to your condition, it would be good to let someone know what POTENTIALLY could happen and how to treat it....though it is possible they will find out anyway. I wouldn't volunteer information, though I wouldn't try and hide it either.
As for a new job, if you have a physical and have to list medical history/conditions, you'd better list it or it could be construed as lying when they find out later. The physicals are basically to determine if you are physically able to do the job you are applying for, not if you have a chronic condition.
In my situation, I work for a group of doctors and we have self-funded insurance, meaning that after "X" amount is reach company-wide, THEY pay our medical and pharmacy bills. I'm sure in this case, it would be well know amongst the doctors who is costing the corporation what as far as medical conditions.
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T2, diagnosed 8/31/06.
Metformin 500 mg twice daily
HCTZ 12.5 mg every other day for BP
Enalapril 20 mg 1 daily (ace-inhibitor)
Lower carb dieter (approx. 75 total carbs/day, more on weekends), taking chromium, multivitamin and fish oil tablets
Initial A1C 8/06: 9.6
11/06: 6.2.
03/07: 5.3
06/07: 5.4
10/07: 5.3
05/08: 6.2 (after dealing with shingles & bronchiti)
2/09: 5.5 | 
