Can I get into trouble if i use my own DR for a workcomp injury using my own personal health insurance?

I don't know about in TN; but in Florida, we have to do it that way sometimes just to prove to the comp carrier that there is a problem that they have not authorized care for. When we do this, we know that the comp carrier won't retroactively pay for the evaluations and treatments that they didn't authorize; but we try to use the reports to show that there is something going on that really should be authorized going forward. Sometimes it works.

You didn't have to BS your doctor because the comp carrier already denied your claim for your back; therefore it was not a part of your comp claim at that time. You're welcome to see your own doctors whenever you need to for non-comp health issues. And, like you said, you had to do something.

Disclaimer: As a Florida attorney, I can only offer you the above as my thoughts on the matter and not as specific legal advice for you to follow. I'm not licensed in TN either.

I understand why you went to your own doctor. If you needed immediate treatment, then you did the right thing. However, it could hurt your case if you don't tell your doctor the truth about your injury -- that you were hurt at work. It would be a good idea to consult with a workers compensation attorney in your area as soon as possible to get this straightened out.