title: Disenrollment of Medicare cancer patients from health maintenance organizations.
abstract: OBJECTIVE
  There is concern that financial incentives in health maintenance organizations (HMOs) might result in pressures to induce sicker members to disenroll. The authors compared disenrollment rates of Medicare HMO enrollees with cancer with disenrollment rates for cancer-free enrollees, using Medicare enrollment files linked to population-based tumor registry data from the Surveillance, Epidemiology, and End Results (SEER) Program.
  
  
  METHODS
  The authors identified all aged Medicare beneficiaries who enrolled in an HMO located in a SEER reporting area during 1985 to 1989. Time to disenrollment was analyzed using a proportional hazards model.
  
  
  RESULTS
  Overall, cancer patients were no more likely to disenroll than others. However, persons diagnosed with cancer after enrollment were less likely to disenroll than other persons in Independent Practice Association (IPA) mode HMOs (relative risk [RR] = 0.79). Persons diagnosed with cancer after enrollment in group- and staff-model HMOs were about equally likely to disenroll as other persons (RR = 0.91). Persons diagnosed with cancer less than 18 months before enrollment were at high risk for disenrollment from both IPA and group-/staff-model HMOs (RR = 1.47 and 1.35). There was substantial variation among HMOs in overall disenrollment rates and in RRs for disenrollment by cancer patients.
  
  
  CONCLUSIONS
  The low disenrollment rates of patients diagnosed after enrollment do not support the contention that features intrinsic to managed care make HMOs unattractive to the seriously ill. Monitoring of selective disenrollment could be used as a screen for possible access and quality problems.
authors.affiliation: Office of Research and Demonstrations, Health Care Financing Administration, Baltimore, MD 21244-1850, USA.
authors.forename: G F
authors.initials: GF
authors.lastname: Riley
authors.forename: E J
authors.initials: EJ
authors.lastname: Feuer
authors.forename: J D
authors.initials: JD
authors.lastname: Lubitz
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006279:Health Maintenance Organizations / Q000191:economics / Q000706:statistics & numerical data*; D006302:Health Services Research; D006801:Humans; D015273:Insurance Selection Bias; D008297:Male; D006278:Medicare / Q000706:statistics & numerical data*; D009369:Neoplasms / Q000191:economics*; D010352:Patient Dropouts / Q000706:statistics & numerical data*; D017060:Patient Satisfaction; D016016:Proportional Hazards Models; D012306:Risk; D018426:SEER Program; D013997:Time Factors; D014481:United States