Cosmetic surgery is defined as:

Cosmetic surgery refers specifically to surgical procedures that are performed solely for the purpose of enhancing or altering a person's appearance rather than for medical necessity. This can include procedures such as rhinoplasty, facelifts, breast augmentation, and liposuction. The key element here is that these surgeries are elective and focused exclusively on improving aesthetic aspects rather than addressing medical issues or health concerns.

In contrast, procedures for medical necessity typically encompass surgeries aimed at correcting deformities, repairing injuries, or addressing health complications, which would not fall under the definition of cosmetic surgery. Any type of surgical procedure does not accurately distinguish between those performed for cosmetic reasons and those done for medical reasons. Lastly, non-invasive aesthetic treatments, such as facials or chemical peels, do not involve surgery and therefore cannot be classified under cosmetic surgery, as they do not require any incision and often utilize topical applications or light-based technologies instead.