dcjac1957,
I sorry you are experiencing so much pain with the non-healing sacrum along with with the insurer. Some offices are more adept at handling these denials foisted upon those less able to defend themselves.
AI was actually pretty helpful
https://www.google.com/search
it is mostly a problem your doctor has to manage. But many times when challenged the person hired by the insurance company (usually not a doctor) will yield. Meanwhile you suffer needless stress and delay of service.
The denial should include information about why or what they expect you to accomplish first. They like you to use conservative (cheaper) measures first.
Are you on osteoporosis medications.
I hope loriesco responds.