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

Table 3 Distribution of the Charlson score one year before and after ICD-10 implementation, by province

Province	Charlson score	ICD-9	ICD-10	Difference
NL	0	71.01	69.09	1.92
	1-2	23.75	24.88	−1.13
	3+	5.24	6.03	−0.79
PEI	0	71.05	70.77	0.28
	1-2	24.31	24.13	0.18
	3+	4.64	5.10	−0.76
NS	0	64.93	67.06	−2.13
	1-2	26.84	25.72	1.12
	3+	8.23	7.22	1.01
NB	0	66.10	69.18	−3.08
	1-2	26.18	24.36	1.82
	3+	7.72	6.46	1.26
ON	0	66.42	67.46	−1.04
	1-2	25.14	24.38	0.76
	3+	8.44	8.16	0.28
MB	0	68.65	68.81	−0.16
	1-2	24.13	23.90	0.23
	3+	7.22	7.29	−0.07
SK	0	71.45	70.24	1.12
	1-2	23.32	23.64	−0.32
	3+	5.23	6.12	−0.89
AB	0	68.31	68.88	−0.57
	1-2	23.53	22.89	0.64
	3+	8.16	8.23	−0.07
BC	0	71.00	70.53	0.47
	1-2	22.49	22.79	−0.30
	3+	6.51	6.68	−0.17
Canada	0	67.95	68.49	−0.54
	1-2	24.39	23.91	0.48
	3+	7.67	7.60	0.07