Healthcare stocks like UnitedHealth (UNH), Humana (HUM), and Centene (CNC) sold off upwards of 20% on Tuesday's session over the Trump administration's decision to keep Medicare rates flat next year. David Toung calls the decision "quite a surprise" to health insurers who were pricing an increase in rates into their earnings, like UnitedHealth. While there is potential for rates being higher than current projections, David sees these companies cutting benefits if rates don't change.