Public Release: 

Kaiser Permanente study finds continuous health coverage essential for patients managing diabetes

Patients with less coverage receive fewer preventive tests & vaccines

Kaiser Permanente

January 04, 2012-PORTLAND, Ore. -- When patients with diabetes experience interruptions in health - insurance coverage, they are less likely to receive the screening tests and vaccines they need to protect their health. A new study finds that this is true even when patients receive free or reduced-cost medical care at federally funded safety net clinics.

The study was funded in part by the National Institutes of Health and findings published online in the Journal of the American Board of Family Medicine.

"Our study shows that patients need continuous health insurance coverage in order to ensure adequate preventive care, even when that care is provided at a reduced cost," said Rachel Gold, PhD, MPH, lead author and investigator with the Kaiser Permanente Center for Health Research in Portland, Ore.

"Most of the services at our safety net clinics are free, but some of the diagnostic tests require a small co-pay that is usually covered by Medicaid," said Amit Shah, MD, study co-author and Medical Director of the Multnomah County Health Department in Portland. "Patients who lose their Medicaid coverage often delay getting the tests because they can't afford the co-pay."

The study included 3,384 diabetes patients receiving medical care from 2005-2007 at 50 federally qualified health centers in Oregon. These health centers provide free or reduced-cost care to low-income patients regardless of their insurance status. More than half the patients in the study (52 percent) had continuous coverage, most often provided by Medicaid, a publicly funded insurance program for low-income people. Twenty-seven percent had no insurance, and 21 percent had interrupted coverage, during the three-year study period. Patients with private insurance were excluded from the study.

Researchers examined patients' electronic health records to determine whether they received four services recommended at least annually for diabetes patients: a lipid test for high cholesterol, a flu vaccine, a test that measures blood sugar levels, and a urine test that can detect kidney damage.

Forty-eight percent of patients with continuous insurance coverage received at least three lipid-screening tests at one of the study clinics over the three-year study period; 25 percent received three or more flu shots; 72 percent received three or more screenings for blood glucose; and 19 percent received three or more screenings for kidney damage. Patients with no coverage, and patients with interruptions in coverage, received significantly fewer of these services than patients with continuous health insurance coverage.

Notably, the study showed no increase in services received as insurance coverage increased; rather, all patients with discontinuous health insurance were equally vulnerable to missing services, compared to the continuously insured. These findings suggest that public insurance coverage must be continuous to ensure that patients receive consistent and timely care.


The study was funded by the Health Resources and Services Administration, the National Library of Medicine, the National Heart, Lung and Blood Institute at the National Institutes of Health, and the Agency for Healthcare Research and Quality; it was also supported by OCHIN, formerly the Oregon Community Health Information Network, the Oregon Health & Science University Department of Family Medicine, and by the Multnomah County Health Department.

OCHIN provides a rich and diverse data repository derived from an integrated electronic health record system that currently includes over one million patients receiving care in safety net clinics in Oregon and eight other states. The data repository supported by OCHIN is unprecedented for supporting health services research because it contains utilization data not found in other administrative data sources.

Authors include Rachel Gold, PhD, MPH, from the Kaiser Permanente Center for Health Research in Portland, Ore.; Jennifer E. DeVoe, MD, DPhil, Department of Family Medicine at Oregon Health & Sciences University and OCHIN; Patti J McIntire, BA:PPPM, Jon E. Puro, MPA:HA, Susan L. Chauvie, RN, MPA-HA with OCHIN, Inc; and Amit R. Shah, MD, with the Multnomah County Health Department.

About the Kaiser Permanente Center for Health Research (

The Kaiser Permanente Center for Health Research, founded in 1964, is a nonprofit research institution dedicated to advancing knowledge to improve health. It has research sites in Portland, Honolulu, and Atlanta.

About Kaiser Permanente

Kaiser Permanente is committed to helping shape the future of health care. We are recognized as one of America's leading health care providers and not-for-profit health plans. Founded in 1945, our mission is to provide high-quality, affordable health care services and to improve the health of our members and the communities we serve. We currently serve 8.9 million members in nine states and the District of Columbia. Care for members and patients is focused on their total health and guided by their personal physicians, specialists and team of caregivers. Our expert and caring medical teams are empowered and supported by industry-leading technology advances and tools for health promotion, disease prevention, state-of-the art care delivery and world-class chronic disease management. Kaiser Permanente is dedicated to care innovations, clinical research, health education and the support of community health.

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About Safety Net West, OCHIN's PBRN (

As an Agency for Health Research and Quality and a registered Practice-based Research Network, the mission of Safety Net West is to improve the health of underserved populations, enhance quality of care, and inform health policy through research.

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