Insurance Data Misses Most Mammograms Study Finds

Scientists looked at insurance records for breast cancer screening in Delaware. The raw numbers said 172 women out of 1000 got mammograms in 2022. But that count was wrong. Two different math fixes gave very different answers. One method bumped it to 176. The other jumped to 322. That is a huge gap.

The problem is insurance data misses things. Some claims get coded wrong. Some people pay cash. Others have coverage that does not show up. Researchers used a fancy bias tool to test two fixes. First they used total medical claims as a clue. Second they looked at how many had government insurance. Both used computer simulations to handle uncertainty.

The first fix changed the number just a little. The second fix nearly doubled it. The real rate is probably somewhere in between. But nobody knows for sure. This matters because health leaders use these numbers to plan programs. If the data is off by half the resources go to the wrong places.

Experts say always check administrative data for hidden gaps. Do not trust the first count you see. Ask how the data was collected. Ask what might be missing. Better methods can reveal the truth. But they take more work and better assumptions.