So from that to 2 years depending on what type of school you attend. I am actually going to school for Medical Billing and Coding and I finished my Diploma program in just 9 months and now the Associate Program is about 9 months so 18 months and you will have your Associate Degree.11 people found this useful.ow long do you go to school for medical billing and coding? you have to go to school for about 5-8 years of school that's what i heard:) You can however take up online training courses for any or both of this fields and finish it at … your own pace as they have no specific schedules.