You're a medical assistant student who is currently working for Dr. Smith free of charge while you finish your studies. You're probably completing a(n)?

In the context of medical assistant training, the term "practicum" refers to a practical experience where students apply their learned skills in a real-world medical environment. This hands-on training is essential for students as they prepare to enter the workforce, allowing them to gain valuable experience, develop clinical skills, and understand the operations of a medical office.

Completing a practicum while working for Dr. Smith without charge indicates that you're fulfilling a requirement of your educational program, which is designed to bridge the gap between theoretical knowledge and practical application. Students typically engage in practicums as part of their curricula to demonstrate competence and prepare for certification or future employment in the healthcare field.

Other terms in the question relate to different concepts: a diploma generally refers to the educational credential awarded upon completion of a course of study, certification is often a designation that confirms a person’s qualifications in a specific area, and accreditation is a process through which educational institutions are evaluated for quality assurance. None of these terms accurately describe the practical experience you are gaining while working with Dr. Smith.