I am 23, 5 foot 3, weigh 140lbs, and my bra size is 34G. Am I a good candidate for breast reduction? (Photos)

You appear to be a good candidate for a breast reduction. Whether it will be covered by your insurance is unknown until you see a plastic surgeon and have your case submitted for approval. Most insurance companies require about 500gms of tissue to be removed per side. This can likely be accomplished through a vertical pattern breast reduction.  A consultation in person would confirm this and give you a more detailed recommendation. I feel you would have a very nice outcome and relief of you neck and back pain.Best wishes,Dr.Bruno

Thank you for the question. Based on your description you may be an excellent candidate for breast reduction surgery.   However, much more information is needed to determine whether you should proceed with surgery, and if so when (timing).  In my practice, I individualize the “timing” of surgery based on a lot of information that is transmitted during the consultation process.
“Typical” patients who present for breast reduction surgery are women who have disproportionately large breasts, causing problems such as neck/back/shoulder discomfort, postural changes, bra strap grooving, skin irritation/rashes under the breasts, and/or difficulty with activities of daily living and/or exercise etc. There may be both physical as well as psychosocial “stress” caused by the disproportionately large breasts.
Reducing breast tissue mass and elevating the breasts on the chest wall tend to improve or alleviate many of the symptoms associated with the disproportionately large breasts.
Patients considering breast reduction surgery should also consider the potential downsides (risks/complications) associated with the procedure as well. Poor scarring, for example may be associated with the procedure.  Additional surgery may be necessary in the short or longer term for a multitude of reasons.
 Best to check directly with your insurance company to see whether breast reduction surgery is a “covered” benefit with your specific policy. Then, given that every insurance company has different “criteria”, best to identify exactly what your specific insurance company considers criteria for approval. Generally, the more documentation you have (for example, from your primary care doctor, physical therapist, chiropractor etc.) the better when it comes to obtaining insurance “authorization” for the procedure.  
This documentation and letter/pictures from your plastic surgeon will help you obtain authorization. Keep in mind, as you work towards your goals breast reduction surgery is one of the most patient pleasing operations we perform. 
Also, prepare to be persistent when dealing with health insurance companies.  Best wishes.