I'm 38 now. I have been on the pump/CGM (MM670G) for just under three years. I was on pills for 2-3 years, at first the metformin and glimiperide were enough and I got my A1C back to the sixes; but I maxed those out and it was climing agian. Then maxed out Onglyza, then maxed out Invokana at which point I switched to the pens.

The problem with the pens is that I would need 25 units of basal insulin and 25 units of the rapid acting insulin. You can't "undo" your 24 hour basal injection; so if you don't eat enough carbs or exercise too much you can go low. The pens are also not nearly as precise as a pump for delivering the rapid insulin.

After my A1C climbed back, my endocrinologist prescribed the pump and CGM closed loop system. We did a blood test that showed I was T1, which was enough for United Healthcare to pay for the CGM and not just the pump.