Insurance companies make money two ways: investing premiums (the "float") and paying out less than they collect. The second mechanism creates a structural incentive to deny, delay, and reduce every claim. The industry's combined ratio — claims paid plus operating costs divided by premiums collected — targets 95-98%. Every percentage point below 100% is profit.

Health insurers deny approximately 17% of in-network claims. Prior authorization — requiring pre-approval before treatment — has become the primary denial mechanism. UnitedHealthcare processes 60 million prior authorization requests annually. Their AI-powered denial system was revealed to have a 90% error rate when denials were appealed, suggesting the system is designed to deny first and correct only when challenged.

The calculation is simple: if 90% of denials are wrong but only 10-15% of patients appeal, the company saves money on the 75-80% of wrongful denials that are never challenged. Denial is profitable precisely because most people give up.

The insurance industry's litigation strategy was documented in Jay Feinman's research as "delay, deny, defend." Step one: delay payment as long as possible (the float generates investment income daily). Step two: deny the claim on technical grounds. Step three: if the policyholder pushes back, defend with overwhelming legal resources.

Common denial tactics include: interpreting policy language in the narrowest possible way, requesting excessive documentation, claiming pre-existing conditions, arguing treatments are "experimental" or "not medically necessary" (using the insurer's own doctors rather than the treating physician), and applying retroactive policy rescission for minor application errors.

Property insurers use similar tactics after natural disasters. After Hurricane Katrina, State Farm was found to have systematically reclassified wind damage (covered) as flood damage (not covered under standard policies). Internal emails showed adjusters were instructed to find reasons to deny rather than reasons to pay.

Always appeal denials — the success rate on appeal ranges from 40-70% depending on the insurer and type of claim. The insurer is counting on you giving up. File appeals in writing with specific policy language and medical documentation. Request the specific reason for denial in writing — insurers are legally required to provide this.

Know your state's external review process. Most states allow you to appeal to an independent reviewer after exhausting the insurer's internal process. External reviews overturn denials 40-60% of the time. File complaints with your state insurance commissioner — patterns of complaints trigger regulatory scrutiny.

Document everything: dates of calls, names of representatives, reference numbers. Use certified mail for written communications. If the claim is substantial, consult a policyholder attorney — many work on contingency.