Breadcrumb Home Office Systems Technology OST 248 OST 248: Diagnostic Coding Download as PDF Program Office Systems Technology Credits 3 Class Hours 2 Lab Hours 2 Clinical Experience Hours 0 This course provides an in-depth study of diagnostic coding. Emphasis is placed on ICD coding system. Upon completion, students should be able to properly code diagnoses in a medical facility. State Prerequisites MED 121 or OST 141