Table 2.

Agreement in coding for digital mammography technologies in medicare claims files by year

2001*20022003
Digital mammographyNo. mammograms15,60820,89121,133
Digital codes in both Medicare files, n (%)69 (0.4)465 (2.2)649 (3.1)
Concordance, %99.299.199.0
κ (95% CI)0.51 (0.44-0.59)0.83 (0.81-0.86)0.85 (0.83-0.87)
CADNo. mammograms15,41020,24420,262
CAD codes in both Medicare files, n (%)219 (1.4)1,589 (7.9)3,551 (17.5)
Concordance, %97.397.095.1
κ (95% CI)0.50 (0.46-0.54)0.82 (0.81-0.83)0.85 (0.84-0.86)
  • *Claims filed from April 1, 2001 to December 31, 2001.

  • Coding comparisons made between the Outpatient claims and the Carrier Claims files.

  • P < 0.001.