What does the prefix "sub-" mean?

The prefix "sub-" means "under" or "below," which aligns with its usage in various medical terms. For example, when considering the word "subcutaneous," it refers to something situated or occurring beneath the skin. This prefix helps to specify the location of structures or conditions in relation to others, indicating a position that is lower or beneath another reference point in anatomical terminology. Therefore, understanding this prefix is essential for accurately interpreting medical language and conveying precise information in medical billing and coding practices.