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Table 1 Prevalence of Charlson and Elixhauser Co-morbidities in ICD-10 Administrative and Chart Data by Study Year, N = 3'449*

From: Improved accuracy of co-morbidity coding over time after the introduction of ICD-10 administrative data

 

Prevalence of co-morbidities

Prevalence difference, Δ Chart-ICD

 

1999

(n = 1'158)

2001

(n = 1'195)

2003

(n = 1'146)

1999

2001

2003

 

COMORBIDITIES

ICD-10

Chart

ICD-10

Chart

ICD-10

Chart

Δ

(95%CI)

Δ

(95%CI)

Δ

(95%CI)

P-value**

 

N1

N2

N1

N2

N1

N2

%

%

%

%

%

%

 

Cardiac arrhythmias2

85 (5.7)

237 (15.9)

133 (8.9)

292 (19.5)

144 (9.6)

229 (15.3)

10.2

(9.1-11.3)

10.6

(9.3-11.9)

5.6

(4.0-7.3)

< 0.001

Congestive heart failure1,2

76 (5.1)

302 (20.2)

80 (5.3)

285 (19.0)

85 (5.6)

268 (17.9)

15.1

(13.8-16.4)

13.7

(12.5-14.1)

12.2

(10.5-14.0)

< 0.001

Myocardial infraction1(a)

49 (3.2)

64 (4.3)

57 (3.8)

48 (3.2)

57 (3.8)

70 (4.7)

1

(0.3-1.8)

-0.6

(-1.3-0.1)

0.9

(-0.4-2.2)

0.437

PVD1,2

43 (2.9)

159 (10.6)

74 (4.9)

316 (21.0)

59 (3.9)

168 (11.2)

7.7

(6.9-8.5)

16.1

(14.9-17.3)

7.3

(6.1-8.4)

< 0.001

PCD2

20 (1.4)

49 (3.3)

31 (2.1)

68 (4.5)

27 (1.8)

55 (3.7)

1.9

(1.4-2.5)

2.5

(1.8-3.1)

1.9

(1.2-2.5)

< 0.001

Valvular disease2

45 (3.0)

134 (8.9)

61 (4.1)

186 (12.4)

103 (6.9)

149 (10.0)

6

(5.1-6.8)

8.3

(7.2-9.4)

3.1

(1.6-4.6)

< 0.001

CEVD1,2

58 (3.9)

127 (8.5)

73 (4.9)

162 (10.8)

74 (4.9)

123 (8.2)

4.6

(3.6-5.6)

5.9

(4.9-7.0)

3.3

(2.0-4.5)

< 0.001

Hemiplegia or paraplegia1,2

17 (1.1)

88 (5.9)

31 (2.1)

101 (6.8)

36 (2.4)

90 (6.0)

4.7

(4.1-5.4)

4.7

(4.0-5.5)

3.6

(2.5-4.7)

< 0.001

Hypertension 2

230 (15.4)

437 (29.2)

311 (20.7)

443 (29.6)

366 (24.4)

457 (30.5)

13.8

(12.2-15.4)

8.9

(7.3-10.5)

6.1

(3.6-8.5)

< 0.001

CPD1,2

57 (3.8)

161 (10.8)

87 (5.8)

174 (11.6)

109 (7.3)

205 (13.6)

7

(6.0-7.9)

5.8

(4.8-6.8)

6.4

(4.9-7.9)

< 0.001

Diabetes

             

   - with complication1,2

23 (1.5)

42 (2.8)

20 (1.4)

33 (2.2)

25 (1.7)

53 (3.6)

1.4

(0.6-2.3)

1.5

(0.6-2.5)

0.8

(-0.9-2.5)

< 0.001

   - without complication1,2

76 (5.1)

97 (6.5)

95 (6.3)

118 (7.8)

132 (8.8)

144 (9.6)

1.2

(0.7-1.8)

0.8

(0.4-1.3)

1.9

(1.5-2.3)

< 0.001

Hypothyroidism2

14 (0.9)

33 (2.2)

40 (2.6)

63 (4.2)

35 (2.3)

64 (4.3)

1.3

(0.8-1.7)

1.6

(1.0-2.2)

2

(1.0-3.0)

< 0.001

Peptic ulcer1

15 (1.0)

59 (3.9)

24 (1.6)

49 (3.3)

19 (1.3)

68 (4.5)

3

(2.2-3.7)

1.7

(1.1-2.2)

3.3

(2.3-4.2)

< 0.001

Peptic ulcer (ex. bleeding) 2

3 (0.2)

44 (2.9)

10 (0.6)

41 (2.7)

8 (0.6)

57 (3.8)

2.7

(2.1-3.3)

2.1

(1.6-2.6)

3.3

(2.4-4.1)

< 0.001

Liver disease2

36 (2.4)

89 (5.9)

40 (2.6)

93 (6.2)

46 (3.1)

101 (6.7)

3.5

(2.8-4.3)

3.6

(2.9-4.3)

3.7

(2.5-4.8)

< 0.001

- Mild liver disease1

32 (2.1)

49 (3.3)

34 (2.3)

41 (2.7)

38 (2.6)

52 (3.5)

1.2

(0.6-1.8

0.4

(-0.1-0.9)

0.9

(0.2-1.7)

< 0.001

- MSLD1

6 (0.4)

4 (0.3)

10 (0.7)

9 (0.6)

19 (1.2)

9 (0.6)

-0.1

(-0.3-0.1)

-0.1

(-0.3-0.1)

-0.6

(-1.1--0.2)

0.028

Any Tumor1

132 (8.8)

124 (8.2)

136 (9.1)

142 (9.5)

157 (10.4)

146 (2.2)

-0.5

(-1.6-0.5)

0.4

(-0.6-1.4)

-0.7

(-2.4-0.9)

0.627

Lymphoma2

18 (1.2)

29 (2.5)

26 (1.7)

30 (2.8)

16 (1.1)

25 (2.2)

1.3

(0.8-1.9)

0.6

(0.2-1.0)

1.1

(0.4-1.8)

< 0.001

Metastatic cancer1,2

40 (2.7)

120 (8.1)

75 (5.0)

119 (8.0)

71 (4.8)

119 (7.9)

-0.4

(-1.5-0.6)

0.6

(-0.4-1.7)

-1.7

(-3.2--0.1)

0.842

STWM2

125 (8.3)

117 (7.9)

140 (9.3)

148 (10.0)

153 (10.2)

128 (8.5)

5.4

(4.5-6.3)

3

(2.0-3.9)

3.2

(1.8-4.6)

< 0.001

Renal failure1,2

65 (4.3)

147 (9.8)

61 (4.1)

152 (10.1)

59 (4.0)

150 (10.0)

5.5

(4.6-6.4)

6

(5.2-6.8)

6

(5.1-6.9)

< 0.001

Rheumatic disease1,2

10 (0.7)

27 (1.8)

17 (1.1)

29 (1.9)

14 (0.9)

49 (3.2)

1.1

(0.7-1.6)

0.8

(0.3-1.3)

2.3

(1.7-2.9)

< 0.001

AIDS/HIV1,2

9 (0.6)

15 (1.0)

4 (0.2)

7 (0.5)

3 (0.2)

13 (0.9)

0.3

(0.0-0.7)

0.2

(0.1-0.4)

0.7

(0.4-0.9)

< 0.001

Blood loss anemia2

3 (0.2)

55 (3.7)

11 (0.7)

80 (5.4)

12 (0.8)

99 (6.6)

3.5

(3.1-4.0)

4.6

(4.2-5.0)

5.8

(5.2-6.3)

< 0.001

Deficiency anemia2

11 (0.8)

59 (3.9)

25 (1.7)

79 (5.3)

17 (1.2)

65 (4.3)

3.2

(2.5-3.9)

3.6

(2.9-4.2)

3.2

(2.1-4.2)

< 0.001

Coagulopathy2

17 (1.1)

45 (3.0)

18 (1.2)

64 (4.3)

30 (2.0)

95 (6.3)

1.9

(1.4-2.4)

3.1

(2.6-3.6)

4.3

(3.3-5.4)

< 0.001

FED2

20 (1.4)

106 (7.1)

32 (2.2)

123 (8.2)

59 (4.0)

152 (10.1)

5.7

(5.1-6.3)

6.1

(5.4-6.7)

6.2

(5.0-7.3)

< 0.001

Weight loss2

8 (0.5)

58 (3.9)

14 (0.9)

82 (5.5)

10 (0.7)

63 (4.2)

3.3

(2.8-3.8)

4.5

(3.9-5.1)

3.5

(2.9-4.1)

< 0.001

Obesity2

33 (2.2)

104 (7.0)

48 (3.2)

99 (6.6)

62 (4.1)

110 (7.3)

4.7

(4.1-5.4)

3.4

(2.6-4.2)

3.2

(1.9-4.5)

< 0.001

Alcohol abuse2

41 (2.7)

92 (6.1)

62 (4.2)

97 (6.5)

67 (4.5)

116 (7.7)

3.4

(2.7-4.1)

2.3

(1.6-3.1)

3.3

(2.1-4.5)

< 0.001

Drug abuse2

15 (1.0)

31 (2.1)

14 (1.0)

28 (1.8)

27 (1.8)

52 (3.4)

1

(0.6-1.4)

0.9

(0.6-1.2)

1.6

(1.0-2.3)

< 0.001

Dementia1

22 (1.5)

32 (2.2)

19 (1.3)

30 (2.0)

20 (1.3)

23 (1.6)

0.7

(0.1-1.2)

0.7

(0.3-1.2)

0.2

(-0.1-0.6)

< 0.001

Psychosis2

3 (0.2)

23 (1.6)

14 (1.0)

26 (1.7)

11 (0.7)

23 (1.5)

1.3

(0.9-1.7)

0.8

(0.4-1.2)

0.8

(0.3-1.3)

< 0.001

Depression2

56 (3.7)

121 (8.1)

83 (5.5)

140 (9.3)

92 (6.2)

154 (10.3)

4.4

(3.5-5.2)

3.8

(2.8-4.8)

4.1

(2.7-5.5)

< 0.001

  1. Abbreviations: PCD = Pulmonary circulation disorders, PVD = Peripheral vascular disease, CEVD = Cerebrovascular disease, CPD = Chronic pulmonary disease, MSLD = Moderate and severe liver disease, STWM = Solid tumour without metastasis, FED = Fluid and electrolytic disorders.
  2. * Sample size without weighted sampling fraction (i.e., observed sample size).
  3. **Cochran Q test for heterogeneity of prevalence difference (Δ Chart-ICD ) between chart review and administrative data across years.
  4. 1 Charlson co-morbidities; 2 Elixhauser co-morbidities.
  5. (a) Only recent myocardial infarction.
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