Agreed... I don't know if the incentives are on a per person basis or on a percentage of practice basis... Most insurance is paid solely on a volume basis, but it seems from the abstract that Kaiser pays PCP's based on x percentage of your patients receiving x screening or obtaining x goal, which is the incentivation that SHOULD be included in medicine (ie, outcomes based).
I said long ago, compensation should be a combination of salary (baseline salary based on number of patients you have, as hmo's pay you x money per person to provide care for) plus compensation per visit/procedure (so salary is almost like a subscription to have a doctor, the compensation per visit/procedure equates for differences in usage) and then compensation based on outcomes (stratified for number of patients with measurable outcome, incentive based on % that meet the outcome, like % HbA1C < 7, HTN < 130/85 for our PCPs, or Complication rates or survival numbers for surgeons, etc). This combo deals with people not having PCP's, fear of over utilization, and incentives for proper practice of medicine