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Internal validation of procedure codes on Medicare claims for digital mammograms and computer-aided detection

Affiliations

• ¹ Department of Family and Community Medicine, University of California, Davis, Sacramento, CA 95817, USA. Joshua.fenton@ucdmc.ucdavis.edu

• PMID: 19661075
• DOI: 10.1158/1055-9965.EPI-09-0338

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Joshua J Fenton et al. Cancer Epidemiol Biomarkers Prev. 2009 Aug.

• ¹ Department of Family and Community Medicine, University of California, Davis, Sacramento, CA 95817, USA. Joshua.fenton@ucdmc.ucdavis.edu

• PMID: 19661075
• DOI: 10.1158/1055-9965.EPI-09-0338

Item in Clipboard

Background: Billing data, such as Medicare claims, are a potential data source for evaluative studies of new digital mammography technologies, such as digital mammography and computer-aided detection (CAD).

Objective: To assess the internal validity of procedure codes on Medicare claims for screening mammography interpreted with either digital mammography or CAD.

Study design: We assessed agreement of procedure coding for digital versus film mammography and CAD use versus nonuse for mammograms with claims appearing in two independent Medicare claims files (the Carrier Claims and Outpatient files).

Subjects and setting: Women enrolled in fee-for-service Medicare who received screening mammography in 2001 to 2003 within Surveillance, Epidemiology, and End Results regions, representing 25% of the U.S. population (n = 35,642 women who received 57,632 total mammograms).

Measures: Coding agreement beyond chance (kappa), overall, and by year.

Results: Overall coding agreement was excellent for both digital versus film mammography [kappa = 0.81 (95% confidence interval, 0.80-0.83)] and for CAD use versus nonuse [kappa = 0.82 (95% confidence interval, 0.81-0.83)]. However, in 2001, agreement was only moderate (kappa = 0.51 for digital versus film and kappa = 0.50 for CAD use versus nonuse) but increased to higher levels in 2002 and 2003 (kappa > 0.80 for both technologies).

Conclusions: High internal agreement in procedure codes for digital mammography technologies is consistent with accurate coding on Medicare claims after 2001, although external validation remains desirable.

PubMed Disclaimer

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  Fenton JJ, Zhu W, Balch S, Smith-Bindman R, Lindfors KK, Hubbard RA. Fenton JJ, et al. Cancer Epidemiol Biomarkers Prev. 2012 Aug;21(8):1344-7. doi: 10.1158/1055-9965.EPI-12-0406. Epub 2012 Jun 13. Cancer Epidemiol Biomarkers Prev. 2012. PMID: 22695737 Free PMC article.

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