Type 1B Diabetes

Just means it's a non-immune system form of type 1, used to be misdiagnosed as type 2 a lot. Type 1a is Auto-immune Diabetes Mellitus.

Hi @jamesfitz and welcome to the forum.
I have not heard anyone else here mention Type1b but did find this article.

You have Type 1b if:
You meet two criteria: the first, if there is no evidence in your blood that your immune system is attacking beta cells and the second, if you have alternating cycles where you need and then don’t need insulin replacement. This form of the disease is unusual and most often diagnosed in those of African or Asian heritage.

http://dtc.ucsf.edu/types-of-diabetes/type1/understanding-type-1-diabetes/what-is-type-1-diabetes/