It's not a prefix in the context in which you're using it. It's merely spelling a word incorrectly based on how some people say it. It has zero semantic value. It is completely unrelated to the prefix a which just means without.
For example the median expected annual pay for a typical Medical Records Technician in the United States is $32,140 so 50% of the people who perform the job of Medical Records Technician in the United States are expected to make less than $32,140.
Medical Records Clerk Health Information Technicians salaries vary depending on the location and the setting. The assumption was made that the Medical Records Clerks reflected here were working an average of 40 hours per week with a total of 2080 hours per year.