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Table 2 Distribution of the Charlson score one year before and after ICD-10 implementation

From: Implementation of ICD-10 in Canada: how has it impacted coded hospital discharge data?

Charlson score

ICD-9

ICD-10

Difference

0

67.94

68.53

−0.59

1

15.41

14.90

0.51

2

8.98

9.00

−0.02

3

3.47

3.38

0.09

4

1.39

1.40

−0.01

5

1.89

1.96

−0.07

6+

0.92

0.83

0.11

Average Charlson score

0.64

0.63

0.01