As an addition - you may have epidural injections at multiple sites. The limitations are based on one site. For example you can do them in cervical, thoracic and lurabar -various levels. In one certain level/site the recommended amount is up to 3 injections every 6 months. I get rotating injections in my cervical, thoracic and lurabar. Each quarter we go to a new site.
For example I just finished a series of 6 injections - 3 on my right L5/S1 and 3 on my left L5/S1. I do my cervical next quarter.