I have a CDHP health insurance plan that comes with an Health Savings Account. As I'm filing my taxes, Turbotax has informed me that my HSA is being additionally taxed because I do not have HDHP coverage.

Does my CDHP plan count as HDHP for tax purposes? If not, why do employers offer CDHP with HSA?

If its relevant: my deductible is $2000 in network and $4000 out of network

I found this site which claims that the 2016 minimum deductible for HSAs is $1300 for my case, which seems to imply that my plan is and HDHP. Is my interpretation correct?