 Every year, Medicare evaluates plans based on a five-star rating system. Humana is a Medicare Advantage HMO organization with a Medicare contract. Enrollment in any Humana plan depends on contract renewal. Here's another remarkable success story from QC Kinetics. This one from Chad, who hurt his knee at the gym one day, and it just kept on hurting for months. From my high school football and wrestling days, I already had a little bit of damage in there, but this just sent it over the edge. Chad tried traditional treatments with no improvement.