Careful injection of filler can camoflouge the groove temporarily, but will not actually fix what is causing the problem, and it may not give you a look that you like any better (it will add volume to the center and can give the whole tip a rounder appearance). It appears from the photo that you have prominent lower lateral nasal cartilages, and the groove you see is the space between the two sides. This is best addressed surgically. Also, a deviated septum could be addressed during the same surgery. To determine if your septum is deviated, your surgeon just needs to take a look inside your nose. If you have difficulty breathing and have a deviated septum, then insurance will likely cover your septoplasty. Your surgeon can request a pre-authorization before surgery to make sure. Some insurance companies request a CT scan for additional documentation of a deviated septum before authorizing surgery. Insurance will not cover cosmetic alteration of your tip. If you were to get your septum fixed at the same time as a cosmetic rhinoplasty, then your insurance would pay for the anesthesia fee, facility fee, and surgeons fee related to the time spent on the septoplasty, and you would be responsible for fees related to the time spent on the cosmetic portion of your procedure. Typically if you combine the two, your overall cost is less than if you were to do both separately. Good luck!