There are varying guidelines from pain organizations about how many is the appropriate number of injections. Usually, it comes down to less than 3 steroid injections every 6 months. Realize, many injections don’t require steroids so they would not count in these numbers.
In the end, your insurance company will determine how many steroid injections and/or procedures you can get in a twelve-month period. Feel free to look into your insurance pain procedure policies or just ask!