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Is it a negative to be in a healthcare field rather than a finance/accounting field?
No it isn't. In fact it might be a benefit, as schools like diversity in experience. Jared is right, it's more about how 'good' your job is. If you are doing something that any knucklehead could be doing with just a GED then you'll have a very hard time getting into a good program. If you are doing a job that is selective, and at least on par with your degree then it really doesn't matter what field you are in. Of course the more selective your job, and the more leadership experience you have, the better it will be regarded. What kind of role are you in?
By the way I just checked on US News, and the PT program doesn't seem too competitive. They accept around 73% of applicants, the average GPA is 3.34, the middle 80% is 2.85 - 3.78 and the average GMAT is only 643. If your GPA is within that range and you have decent work experience, you should have a very good shot. 730 is an excellent GMAT so that will go a long ways.