From your photos, it's evident that the very front of your septum, what we call the caudal septum, is deflected into your left airway. This can obstruct the external valve of the nose and cause difficulty breathing for some patients. In these cases, correction of this deviation (septoplasty) may be considered medically necessary and insurance coverage could be obtained.
If you are breathing normally, correction of this issue would likely be considered cosmetic. Straightening this cartilage would involve shaving the septum a bit and using sutures to straighten the deflected portion. If this were the only issue to be addressed, the surgery would be quite short (30 minutes) and could be done quite comfortably under a combination of light sedation and local anesthesia. Or, should you so desire, general anesthesia could be used. Your procedure could be done through a closed (endonasal) approach. Hard to give you a precise figure without an examination but a ballpark cost for a straightforward case such as this would likely be in the $3K range.
Best regards,
Dr. Mehta