1. Epilepsy Res. 2009 Nov;87(1):59-69. doi: 10.1016/j.eplepsyres.2009.07.010. Epub
2009 Aug 25.

Concordance of survey and billing data in a study of outpatient healthcare cost
and utilization among epilepsy patients.

Lairson DR(1), Basu R, Begley CE, Reynolds T.

Author information: 
(1)University of Texas Health Science Center at Houston, School of Public Health,
Center for Health Services Research, Houston, TX 77030, USA.

We assessed the concordance between healthcare utilization and cost measured with
patient survey and billing data among 226 epilepsy patients in a large
multi-specialty group practice. Does survey information on utilization combined
with prices, provide a cost of care that is approximately equal to the cost of
care derived from billing data, utilizing the same price structure? Do measures
of cost from survey and billing data yield the same correlates of cost among
epilepsy patients? If so, survey data may be utilized to estimate correlates and 
cost of epilepsy care in cases where complete billing information is not
available. For five of eight outpatient services, the concordance coefficients
exceeded the practical cut-off value for clinical studies, suggesting substantial
agreement between the billing and survey data. Cost was higher when computed from
billing data, but the overall concordance (.75) between the cost estimates is
relatively high, and comparable to findings in studies on other types of
patients. The average 6-month outpatient cost difference was $11 between the two 
sources of cost estimates. Correlates of cost were similar, whether cost was
measured with survey or billing data. The results suggest that correlates of cost
and cost estimates derived from survey data may yield similar findings to cost
estimates from billing data for policy related studies of epilepsy patients.

2009 Elsevier B.V. All rights reserved.

DOI: 10.1016/j.eplepsyres.2009.07.010 
PMID: 19709857  [Indexed for MEDLINE]