Patient sharing among physicians and costs of care: a network analytic approach to care coordination using claims data.
BACKGROUND
Improving care coordination is a national priority and a key focus of health care reforms. However, its measurement and ultimate achievement is challenging.


OBJECTIVE
To test whether patients whose providers frequently share patients with one another-what we term 'care density'-tend to have lower costs of care and likelihood of hospitalization.


METHODS
Cohort study


METHODS
9,596 patients with congestive heart failure (CHF) and 52,688 with diabetes who received care during 2009. Patients were enrolled in five large, private insurance plans across the US covering employer-sponsored and Medicare Advantage enrollees


METHODS
Costs of care, rates of hospitalizations


RESULTS
The average total annual health care cost for patients with CHF was $29,456, and $14,921 for those with diabetes. In risk adjusted analyses, patients with the highest tertile of care density, indicating the highest level of overlap among a patient's providers, had lower total costs compared to patients in the lowest tertile ($3,310 lower for CHF and $1,502 lower for diabetes, p < 0.001). Lower inpatient costs and rates of hospitalization were found for patients with CHF and diabetes with the highest care density. Additionally, lower outpatient costs and higher pharmacy costs were found for patients with diabetes with the highest care density.


CONCLUSIONS
Patients treated by sets of physicians who share high numbers of patients tend to have lower costs. Future work is necessary to validate care density as a tool to evaluate care coordination and track the performance of health care systems.
Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA. cpollac2@jhmi.edu
Craig Evan
CE
Pollack
Gary E
GE
Weissman
Klaus W
KW
Lemke
Peter S
PS
Hussey
Jonathan P
JP
Weiner
D000368:Aged; D000369:Aged, 80 and over; D019058:Community Networks / Q000191:economics / Q000458:organization & administration*; D019033:Delivery of Health Care, Integrated / Q000191:economics / Q000458:organization & administration*; D003920:Diabetes Mellitus / Q000191:economics / Q000628:therapy; D005260:Female; D017048:Health Care Costs / Q000706:statistics & numerical data*; D006302:Health Services Research / Q000379:methods; D006333:Heart Failure / Q000191:economics / Q000628:therapy; D006760:Hospitalization / Q000191:economics / Q000706:statistics & numerical data; D006801:Humans; D007345:Insurance Claim Review / Q000706:statistics & numerical data; D007400:Interprofessional Relations; D008297:Male; D008875:Middle Aged; D014481:United States