Yes that is autoimmune. I have had my antibodies measured at two different labs around the same time. My first showing 47 (up to 6 normal) and the other lab 470 (up to 60 normal). With your results ask for Graves antibodies to be tested as well.
Is it safe to assume that you aren't on any type of replacement thyroid hormones?
I agree that you should have Graves Antibodies tested - those are Thyroid Stimulating Immunoglobulins.
You could have, both, Hashimoto's (as indicated by the tests above) and Graves Disease or you could simply be in a hyper stage of Hashimoto's, which is common in early stages of Hashimoto's. Many people alternate between hyper and hypo or even periods of normal in early stages of Hashimoto's.