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Table 2 Frequency of independent and dependent variables (%) in ICD-9 (1997–2000) and ICD-10 (2001–2004) data

From: Risk adjustment performance of Charlson and Elixhauser comorbidities in ICD-9 and ICD-10 administrative databases

  Congestive Heart Failure Diabetes Chronic renal failure Stroke CABG
  ICD-10
(% of 25969)
ICD-9
(% of 30008)
ICD-10
(% of 11918)
ICD-9
(% of 11411)
ICD-10
(% of 1770)
ICD-9
(% of 2076)
ICD-10
(% of 22947)
ICD-9
(% of 28984)
ICD-10
(% of 10214)
ICD-9
(% of 9578)
In-hospital Mortality 12.4 11.6 4.2 3.7 16.8 13.2 17.0 15.4 2.9 3.3
One year Mortality 40.1 39.7 19.0 17.7 42.0 34.1 29.2 26.1 5.1 5.5
Male 50.2 51.5 55.9 54.4 55.0 56.7 49.6 50.9 79.7 78.6
Senior 85.9 86.8 45.3 44.8 65.0 58.0 77.9 78.5 60.4 59.9
Charlson comorbidities           
   Myocardial infarction 9.6 15.1 3.6 4.9 3.6 5.7 3.4 5.2 19.3 36.1
   Congestive heart failure - - 8.1 8.2 18.9 15.1 4.7 4.3 19.6 16.0
   Peripheral vascular disease 2.1 4.9 11.2 10.2 3.6 3.3 1.7 3.8 5.2 7.4
   Cerebrovascular disease 2.2 3.6 2.5 3.8 2.2 3.0 - - 5.4 6.8
   Dementia 3.8 2.9 3.4 2.4 3.2 1.0 5.6 3.9 0.5 0.1
   Chronic pulmonary disease 16.2 19.6 3.5 5.0 5.5 6.1 3.8 5.2 4.7 8.0
   Rheumatic disease 0.8 1.4 0.7 0.8 2.0 2.5 0.6 0.9 0.3 0.6
   Peptic ulcer disease 0.4 0.3 0.4 0.3 0.3 0.6 0.3 0.3 0.8 1.2
   Mild liver disease 0.8 1.0 1.2 1.6 1.7 1.5 0.3 0.4 0.2 0.5
   Diabetes without chronic complication 24.0 23.1 - - 16.3 18.3 17.1 15.5 25.6 22.8
   Diabetes with chronic complication 4.2 1.8 - - 6.4 2.7 1.5 0.8 5.3 2.8
   Hemiplegia or paraplegia 0.4 0.6 0.6 1.1 0.5 0.6 14.0 16.1 0.7 0.9
   Renal disease 14.2 10.2 17.2 14.9 - - 2.6 1.6 5.9 3.1
   Any malignancy 2.4 2.7 2.0 1.7 4.7 3.1 2.1 2.0 0.9 1.0
   Moderate or severe liver disease 0.4 0.3 0.3 0.3 0.7 0.4 0.1 0.1 0.1 0.1
   Metastatic solid tumor 0.7 0.7 0.8 0.5 1.6 0.5 0.8 0.8 0.1 0.0
   AIDS/HIV 0.0 0.1 0.1 0.1 0.0 0.0 0.0 0.1 0.0 0.1
Elixhauser comorbidities           
   Congestive heart failure - - 8.1 8.2 18.9 15.1 4.7 4.3 19.6 16.0
   Cardiac arrhythmia 28.2 30.0 4.8 6.0 8.5 7.4 13.5 13.8 31.7 36.3
   Valvular disease 10.5 12.4 0.8 1.3 2.8 2.6 1.5 2.1 20.3 17.4
   Pulmonary circulation disorders 1.9 2.0 0.3 0.2 0.5 0.5 0.4 0.3 1.3 1.9
   Peripheral vascular disorders 2.1 4.9 11.2 10.2 3.6 3.3 1.7 3.8 5.2 7.4
   Hypertension 19.4 20.2 20.0 22.2 23.8 22.3 31.4 32.4 33.6 41.6
   Hypertension, uncomplicated 15.9 18.1 14.4 17.1 14.5 19.7 30.2 31.7 30.7 39.9
   Hypertension, complicated 3.5 2.1 5.6 5.1 9.3 2.6 1.2 0.7 2.9 1.7
   Paralysis 0.4 0.6 0.6 1.1 0.5 0.6 14.0 16.1 0.7 0.9
   Other neurological disorders 1.1 1.5 2.2 2.3 2.2 2.6 8.2 8.1 1.0 1.4
   Chronic pulmonary disease 16.2 19.6 3.5 5.0 5.5 6.1 3.8 5.2 4.7 8.0
   Diabetes, uncomplicated 23.3 22.9 - - 15.7 18.1 16.8 15.3 25.4 22.7
   Diabetes, complicated 4.8 2.0 - - 7.0 2.8 1.7 1.0 5.5 2.9
   Hypothyroidism 1.6 2.4 1.6 2.0 1.1 1.5 1.3 1.4 0.8 1.3
   Renal failure 14.2 8.7 17.2 10.4 - - 2.6 1.1 5.9 1.6
   Liver disease 1.1 1.2 1.4 1.7 2.2 1.8 0.4 0.4 0.3 0.5
   Peptic ulcer disease excluding bleeding 0.2 0.2 0.3 0.2 0.2 0.2 0.1 0.1 0.3 0.6
   AIDS/HIV 0.0 0.1 0.1 0.1 0.0 0.0 0.0 0.1 0.0 0.1
   Lymphoma 0.5 0.5 0.3 0.3 1.4 0.9 0.2 0.2 0.1 0.1
   Metastatic cancer 0.7 0.7 0.8 0.5 1.6 0.5 0.8 0.8 0.1 0.0
   Solid tumor without metastasis 1.6 1.9 1.5 1.2 3.2 2.0 1.8 1.6 0.6 0.7
   Rheumatoid arthritis/collagen vascular diseases 0.9 1.6 0.7 0.9 2.7 4.2 0.6 1.0 0.5 0.7
   Coagulopathy 0.7 0.5 0.4 0.4 1.6 0.9 0.7 0.5 1.7 1.5
   Obesity 1.4 1.5 1.8 2.5 0.9 0.8 0.4 0.5 1.3 2.6
   Weight loss 0.6 0.6 1.0 0.9 2.1 1.5 0.4 0.3 0.2 0.3
   Fluid and electrolyte disorders 4.7 4.0 8.4 8.7 12.3 9.9 2.4 2.0 0.9 1.1
   Blood loss anaemia 0.9 1.4 0.4 0.8 1.1 1.7 0.2 0.3 0.1 0.2
   Deficiency anaemia 2.0 0.6 1.4 0.5 2.4 0.7 0.6 0.2 0.4 0.1
   Alcohol abuse 1.7 2.0 3.3 3.0 1.4 1.0 1.8 1.2 1.0 0.8
   Drug abuse 0.3 0.3 1.9 2.0 0.8 0.2 0.4 0.2 0.2 0.3
   Psychoses 0.3 1.4 0.8 2.0 0.8 2.1 0.3 1.0 2.6 0.5
   Depression 1.7 1.9 3.5 3.3 2.7 2.4 2.4 1.8 1.2 1.2
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