Koesterman, Jackie: - Jackie L Koesterman, CPC, has been a Certified Professional Coder and Medical Assistant for over 25 years. Jackie has also served as an instructor at the Minnesota Northland Technical College in the medical clerical and medical assistant programs. Jackie is employed by a large medical health system as a Senior Coder III and Reimbursement Specialist, specializing in multi-specialty coding and multi-payer denial review in both the inpatient and outpatient settings. She also serves as a trainer and mentor to the coders. Jackie performs audits for multi-specialties for private practice clinics in her area.