Politics & Governance / Public Policy / Healthcare Policy

The Algorithm Paying Your Insurer to Deny You Care: The Hidden Math of Healthcare

Tradeoffs in the Design of Health Plan Payment Systems

Michael Geruso, Thomas G. McGuire

Imagine a system where your insurance company makes more money when you get sicker. Sounds like a conspiracy, right? It’s not. It’s the hidden math behind health plan payment systems. In this deep dive, we expose the groundbreaking research from economists Michael Geruso (UT Austin) and Thomas G. McGuire (Harvard Medical School) in their NBER working paper, 'Tradeoffs in the Design of Health Plan Payment Systems.' They reveal a shocking truth: the complex algorithms meant to ensure fairness and control costs are actually backfiring. Using real data from 2 million patients, they prove that the simple, 'dumb' solution—reinsurance—outperforms the sophisticated risk adjustment system in every way. We break down the three key metrics—Fit, Power, and Balance—and show why your specific disease might be secretly profitable for your insurer, while another is a financial loser. By the end, you’ll understand why your therapist is out of network, why hospital bills keep rising, and how a single mathematical mistake is rewriting the infrastructure of American healthcare.