I hear you...it seems unless you say the "s" word you really don't get anywhere here...

Is your insurance carrier denying? what reasons? maybe a different "code" would be better suited...

I'm not a T or an expert in any way ... SI...is seen in Emotional Intensity Disorder (or better known right now as BPD...Borderline Personality Disorder)

Are you talking with a therapist (T)? Not that its fun getting "labeled" if that is what it takes to get the support you need...it is worth exploring...