chiropractic care is so hands on, cheaper and relief is immediate why dont insurers cover it?

compared to an orthopedic office visit ..
Chiro xrays, treatment and PT was around $225.00 for first visit.. followup visits average around $50.00
Orthopedic care.. First visit $670.00 followup visit $80- $150
Pt averages around $60-$90.00
Why dont insurers drop the Alternative care predjudices and pay for good solid alterative health therapies..
I got relieft in three visits at a chiro I didnt get from 10 visits to an ortho and Physical therapists..
If youre trying to lower health care costs. Allow people to CHOOSE the care of their personal choices and cover them equally!