A human who can overturn the machine is only a safeguard if someone actually reaches them. In 2024, ACA insurers denied roughly one in five in-network claims. Patients appealed fewer than one in 600 — but when they did, about 42% of those denials were reversed.
Primary source: KFF — Claims Denials & Appeals in ACA Marketplace Plans, 2024
Data: CMS Transparency in Coverage PUF (plan year 2024) · 111 issuers · via MIMI Labs
Every dot below is one insurer in one state. Its denial rate runs left–right; how often its denials get overturned on appeal runs bottom–top; the size is how many claims it processed. The question the newsletter asks about the bedside — is the override real, or decorative? — has a payer-side twin you can measure.
A high overturn rate is easy to misread as "this insurer is fair, it fixes its mistakes." But look at the spread as you raise the filter: an insurer with 18 appeals and a 90% overturn rate is telling you almost nothing. The signal that survives is the appeal rate itself — and it survives at a fraction of a percent.
Funnel reflects the 111 insurers currently passing the filter. "Appealed" and "overturned" are actual counts from the CMS PUF; the appeal rate is appeals ÷ denied claims.