When a stubborn pain in Nick van Terheyden’s bones would not subside, his doctor had a hunch what was wrong.

Without enough vitamin D in the blood, the body will pull that vital nutrient from the bones. Left untreated, a vitamin D deficiency can lead to osteoporosis.

A blood test in the fall of 2021 confirmed the doctor’s diagnosis, and van Terheyden expected his company’s insurance plan, managed by Cigna, to cover the cost of the bloodwork. Instead, Cigna sent van Terheyden a letter explaining that it would not pay for the $350 test because it was not “medically necessary.”