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Table 4 Secondary codes by SOI occurring in at least 10% of all ischaemic stroke patients

From: Hospital financing of ischaemic stroke: determinants of funding and usefulness of DRG subcategories based on severity of illness

Description of secondary diagnosis code SOI 1 SOI 2 SOI 3 SOI 4 ALL
Number of stroke admissions 52 1233 797 431 2513
Typical stroke risk factors
 Atherosclerosis 9.6% 17.7% 21.5% 20.0% 19.1%
 Arrhythmia and other dysrhythmia 7.7% 14.1% 18.1% 18.3% 16.0%
 Atrial fibrillation 0.0% 18.4% 45.9% 45.5% 31.4%
 Diabetes 0.0% 19.1% 26.7% 29.2% 22.8%
 Obesity, overweight 1.9% 16.4% 17.6% 10.0% 15.4%
 Hypertension 40.4% 62.4% 58.2% 55.9% 59.5%
 Hypercholesterolaemia/ hyperlipidaemia 21.2% 67.8% 56.5% 49.2% 60.0%
 Smoking 23.1% 20.6% 10.9% 10.4% 15.8%
 Previous myocardial infarction 1.9% 8.2% 12.8% 16.9% 11.0%
 Previous stroke 7.7% 14.6% 16.6% 16.0% 15.3%
Other secondary diagnosis codesa
 Hemiplegia, paraplegia, monoplegiab 7.7% 50.1% 65.6% 78.2% 59.0%
 Speech disorderb 17.3% 48.8% 60.0% 71.5% 55.6%
 Apraxia, dysphagia, ataxia, vertigo, cognitive dysfunction 19.2% 29.0% 34.1% 53.6% 34.6%
 Facial paralysisb 9.6% 29.8% 35.6% 42.5% 33.4%
 Mental illnessc 1.9% 12.4% 29.5% 36.4% 21.7%
 Long term use of anti-coagulation 1.9% 14.9% 26.0% 23.4% 19.6%
 Loss of half of the visual field in both eyes 0.0% 9.7% 27.4% 27.6% 18.2%
 Living alone 7.7% 10.2% 17.9% 23.7% 14.9%
 Mitral and/or aorta valve stenosis or insufficiency 3.8% 8.5% 17.4% 20.9% 13.4%
 Atrial septal defect 0.0% 14.7% 10.7% 5.6% 11.5%
 Hypertensive Chronic Renal disease 0.0% 5.9% 15.1% 17.9% 10.7%
 Cancer: neoplasm, lymphoma, carcinoma, myeloma, metastases 1.9% 6.6% 12.0% 16.0% 9.8%
Stroke-related secondary diagnosis
 Any stroke-related diagnosis ICD-9 coded 11.5% 21.2% 24.5% 32.7% 24.0%
  1. ICD: International Classification of Diseases, SOI: severity of illness
  2. aDiagnosis codes including: pre-existing co-morbidities, in-hospital complications, patient characteristics, medical care
  3. bNeurological deficits due to stroke
  4. cIncluding dementia, delirium, Alzheimer, delirium, cognitive dysfunction
  5. dIncluding all 433.x and 434.x ICD-9 codes and subcategories