I need some advise.

I have been a medical biller in the Early Intervention field for 11 years now. I’ve been with a non-profit agency for about 3 years and just recently obtained two certifications, CPB and CPC-A. My employer paid for me to take the test but never gave me a pay increase. I also started doing the pediatric billing for the new program they just started. During my review my boss did speak of a pay increase but I’d have to wait till July/August 2020. Boss not aware of the importance of certification. I live in the MA area and make about $22.88 per hour. Has anyone obtained a cert and not given a pay increase? How much of an increase should I ask for? Also, I don’t plan on staying there full time for another year because the pay in not cutting it and I’d like a coding job.