A medical coder works in the billing department of doctor's offices, hospitals, or other medical facilities. Medical coders transfer healthcare claims into universal medical codes for insurance reimbursement. To work as a medical coder, you must have great attention to detail and a solid base knowledge of medical terminology, procedure and visit authorizations, and insurance billing procedures. Having a degree is not required, but many employers prefer candidates who have an associate degree in medical coding or the Certified Professional Coder (CPC) credential. When you first start in this job, your employer may have you shadow other billing staff members and be supervised when you submit your first few claims.