The MLR incentive question is one I'm digging into for a future issue. The short version: the ACA's 80/85% MLR floor was supposed to constrain overhead, but vertical integration changed the math. When UnitedHealth's Optum division provides services to UnitedHealthcare's members, those internal payments count as "medical expenses" for MLR purposes. The money stays in-house but reports as care delivery. On the denial rate point: 15-17% initial denial rate, 80%+ overturned on appeal, but less than 1% of patients actually appeal. That gap between the overturn rate and the appeal rate is where the profit lives. If you deny 100 claims and only 1 patient appeals, you've effectively reduced payouts on 99 claims at the cost of processing 1 appeal. I'll have the numbers on this in a later issue.