Help I have a number of "pending" medical issues (United States)

I have just got a new job with a good health insurance policy. I do not plan on making this job my career and plan on leaving within a year. I have a number of medical issues such as chronic neck\back pain that I intend to get “fixed” while I have insurance. I’m worried that if I go to a doctor and actually use my insurance I will be flagged for life as having preexisting conditions and will screw myself in the long run because next time I go to get coverage (either on my own if I work for a small company or otherwise) I will either be denied or forced to pay crazy $500/month premiums. Am I better off paying cash to keep these things off the books?