Medical Terminology was created as a standalone course, as it pertains to many healthcare disciplines and is considered more often than not, a pre-med course. Although it might be relevant to what you’re studying, Medical Terminology is generally not a required course once you have started your healthcare program, and hence is not included in the core Picmonic product.
If you are being prompted to upgrade after viewing Medical Terminology, it is available as an add-on to your subscription. Here is a link so you can check the 300+ Picmonics covered, as well as the pricing: https://www.picmonic.com/pricing/medical-terminology!