Master's Degree Admission with a different Bachelor's specialization
I have the same situation. I applied for a CS program after finishing a bachelor in Biomedical Engineering. I just gave an interview just because my bachelor was not relevant and then they accepted me. Depends on your field of interest and your background in that field. 

My field was Machine Learning and Pattern Recognition sand I used to apply them to medical data/signal/images and I just continued the same as a master student in CS. As you see the huge overlap between these two made it easier for me so first think of what you are going to do next and some tips:


You need to know programming! in BME we used to use MATLAB but this is not enough for a computer scientist.
If you are going to do Analysis (algorithm based fields, data analysis and etc) you need to have a good impression of algorithms and math. Of course not professionally but you need an algorithmic &amp; mathematical mind to work in analytics-based fields of CS.
If you are going to do something more related to software stuff or computer networks or information technology, you need to be comfortable with different softwares (depending on the field) and operating systems.
And finally the most important point: All what you read above was only my experience and point of view!


Hope I could help and good luck!