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Diabetes Care, Vol 22, Issue 7 1116-1124, Copyright © 1999 by American Diabetes Association
Type 2 diabetes: incremental medical care costs during the first 8 years after diagnosis
JB Brown, GA Nichols, HS Glauber and AW Bakst
Kaiser Permanente Center for Health Research, Portland, Oregon 97227-1098, USA. brownjon@chr.mts.kpnw.org
OBJECTIVE: To describe and analyze the time course of medical care costs
caused by type 2 diabetes, from the time of diagnosis through the first 8
postdiagnostic years. RESEARCH DESIGN AND METHODS: From electronic health
maintenance organization (HMO) records, we ascertained the ongoing medical
care costs for all members with type 2 diabetes who were newly diagnosed
between 1988 and 1995. To isolate incremental costs (costs caused by the
diagnosis of diabetes), we subtracted the costs of individually matched HMO
members without diabetes from costs of members with diabetes. RESULTS: The
economic burden of diabetes is immediately apparent from the time of
diagnosis. In year 1, total medical costs were 2.1 times higher for
patients with diabetes compared with those without diabetes.
Diabetes-associated incremental costs (type 2 diabetic costs minus matched
costs for people without diabetes) averaged $2,257 per type 2 diabetic
patient per year during the first 8 postdiagnostic years. Annual
incremental costs varied relatively little over the period but were higher
during years 1, 7, and 8 because of higher-cost hospitalizations for causes
other than diabetes or its complications. CONCLUSIONS: For the first 8
years after diabetes diagnosis, patients with type 2 diabetes incurred
substantially higher costs than matched nondiabetic patients, but those
high costs remained largely flat. Once the growth in costs due to general
aging is controlled for, it appears that diabetic complications do not
increase incremental costs as early as is commonly believed. Additional
research is needed to better understand how diabetes and its diagnosis
affect medical care costs over longer periods of time.

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Copyright © 1999 by the American Diabetes Association.
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