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Diabetes Care, Vol 20, Issue 12 1847-1853, Copyright © 1997 by American Diabetes Association
The cost to health plans of poor glycemic control
TP Gilmer, PJ O'Connor, WG Manning and WA Rush
HealthPartners Research Foundation, University of Minnesota, Minneapolis 55440-1309, USA.
OBJECTIVE: We tested the hypothesis that level of glycemic control is
related to medical care costs in adults with diabetes. RESEARCH DESIGN AND
METHODS: Regression analysis was used to estimate the relationship between
glycemic control and medical care charges for 3,017 adults with diabetes
who were continuously enrolled in a large health maintenance organization
(HMO) over a 4-year period. Diagnosis of diabetes was ascertained from
diagnostic and pharmaceutical databases using a method with an estimated
sensitivity of 0.91 and an estimated specificity of 0.99. Charges for care
included defined outpatient and inpatient services. Patients who
disenrolled or who died during the 4-year period were excluded from the
main analysis. RESULTS: Charges for medical care for patients with diabetes
from 1993 to 1995 were closely related to HbA1c level in 1992 before and
after adjustment for age, sex, coronary heart disease, and hypertension.
Standardized 3-year estimates of charges ranged from $10,439 for patients
without comorbid conditions to $44,417 for those with heart disease and
hypertension. Medical care charges increased significantly for every 1%
increase above HbA1c of 7%. For a person with an HbA1c value of 6%,
successive 1% increases in HbA1c resulted in cumulative increases in
charges of approximately 4, 10, 20, and 30%. The increase in charges
accelerated as the HbA1c value increased. For patients with diabetes only,
or with diabetes plus other chronic conditions, the rate of increase in
charges with HbA1c was consistent. CONCLUSIONS: HbA1c provides useful
information to providers and patients regarding both health status and
future medical care charges. Economic data suggest that clinicians should
assign high importance to low HbA1c results and aggressively maintain the
HbA1c status of patients who have low HbA1c values. For economic as well as
clinical reasons, it may be beneficial to lower HbA1c when it is > 8%
and to reduce cardiovascular risk factors. The medical charge data suggest
that investment in clinical systems to improve diabetes care may benefit
both payers and patients.

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Copyright © 1997 by the American Diabetes Association.
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