title: Is this "my" patient? Development and validation of a predictive model to link patients to primary care providers.
abstract: BACKGROUND
  Evaluating the quality of care provided by individual primary care physicians (PCPs) may be limited by failing to know which patients the PCP feels personally responsible for.
  
  
  OBJECTIVE
  To develop and validate a model for linking patients to specific PCPs.
  
  
  METHODS
  Retrospective convenience sample.
  
  
  METHODS
  Eighteen PCPs from 10 practice sites within an academic adult primary care network.
  
  
  METHODS
  Each PCP reviewed the records for all outpatients seen over the preceding 3 years (16,435 patients reviewed) and designated each patient as "My Patient" or "Not My Patient." Using this reference standard, we developed an algorithm with logistic regression modeling to predict "My Patient" using development and validation subsets drawn from the same patient set. Quality of care was then assessed by "My Patient" or "Not My Patient" designation by analyzing cancer screening test rates.
  
  
  RESULTS
  Overall, PCPs designated 11,226 patients (68.3%, range per provider 15% to 93%) to be "My Patient." The model accurately categorized patients in development and validation subsets (combined sensitivity 80.4%, specificity 93.7%, and positive predictive value 96.5%). To achieve positive predictive values of > 90% for individual PCPs, the model excluded 19.6% of PCP "My Patients" (range 5.5% to 75.3%). Cancer screening rates were higher among model-predicted "My Patients."
  
  
  CONCLUSIONS
  Nearly one-third of patients seen were considered "Not My Patient" by the PCP, although this proportion varied widely. We developed and validated a simple model to link specific patients and PCPs. Such efforts may help effectively target interventions to improve primary care quality.
authors.affiliation: General Medicine Division, Medical Services, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA. satlas@partners.org
authors.forename: Steven J
authors.initials: SJ
authors.lastname: Atlas
authors.forename: Yuchiao
authors.initials: Y
authors.lastname: Chang
authors.forename: Thomas A
authors.initials: TA
authors.lastname: Lasko
authors.forename: Henry C
authors.initials: HC
authors.lastname: Chueh
authors.forename: Richard W
authors.initials: RW
authors.lastname: Grant
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Barry
mesh_terms: D000328:Adult; D000465:Algorithms; D001291:Attitude of Health Personnel; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D008329:Managed Care Programs; D008404:Massachusetts; D008875:Middle Aged; D010817:Physician-Patient Relations; D010821:Physicians, Family / Q000523:psychology*; D011787:Quality of Health Care / Q000706:statistics & numerical data; D012189:Retrospective Studies