Table A1.
List of the 50 most frequent ICD-9-CM codes analysed in this study (NOS – not otherwise specified; NEC – not elsewhere classified; TIA – transient ischaemic attack)
| ICD-9-CM code | Description |
|---|---|
| 401.9 | Hypertension NOS |
| 272.4 | Hyperlipidaemia NEC/NOS |
| 427.31 | Atrial fibrillation |
| 486 | Pneumonia, organism NOS |
| 428.0 | Congestive heart failure NOS |
| 250.00 | DMII without complications, not stated as uncontrolled |
| 305.1 | Tobacco use disorder |
| 414.8 | Chronic ischaemic heart disease NEC |
| 403.90 | Hypertensive chronic kidney disease, unspecified, stage I–IV |
| 278.00 | Obesity NOS |
| 599.0 | Urinary tract infection NOS |
| 276.8 | Hypopotassemia |
| 276.51 | Dehydration |
| 285.9 | Anaemia NOS |
| V58.66 | Long-term use of aspirin |
| 276.1 | Hyposmolality |
| 585.9 | Chronic kidney disease NOS |
| V15.82 | History of tobacco use |
| V58.61 | Long-term use of anticoagulants |
| 402.91 | Unspecified hypertensive heart disease with heart failure |
| 584.9 | Acute kidney failure NOS |
| 466.0 | Acute bronchitis |
| 303.91 | Other and unspecified alcohol dependence, continuous |
| V12.59 | Personal history of other diseases of circulatory system |
| V15.29 | Personal history of surgery to other organs |
| V14.0 | Personal history of allergy to penicillin |
| E888.8 | Fall NEC |
| 244.9 | Hypothyroidism NOS |
| 518.81 | Acute respiratory failure |
| 280.9 | Iron deficiency anaemia NOS |
| 041.49 | E. coli infection NEC/NOS |
| V12.54 | Personal history of TIA and cerebral infarction without residual deficits |
| 272.0 | Pure hypercholesterolaemia |
| 518.82 | Other pulmonary insufficiency |
| V58.67 | Long-term use of insulin |
| 434.91 | Cerebral artery occlusion, unspecified with cerebral infarction |
| 311 | Depressive disorder NEC |
| 595.0 | Acute cystitis |
| 276.7 | Hyperpotassemia |
| 511.9 | Pleural effusion NOS |
| V49.84 | Bed confinement status |
| V45.01 | Status cardiac pacemaker |
| 285.29 | Anaemia of other chronic disease |
| 491.21 | Obstructive chronic bronchitis with (acute) exacerbation |
| 593.9 | Unspecified disorder of kidney and ureter |
| V46.2 | Depend-supplement oxygen |
| 276.2 | Acidosis |
| 518.84 | Acute and chronic respiratory failure |
| 275.2 | Disorders of magnesium metabolism |
| 491.20 | Obstructive chronic bronchitis without exacerbation |