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Table 1 ICD-9 classification and diagnosis groups used in the present study
| Main category ICD-9-CM classification | The 30 diagnosis groups | |
|---|---|---|
| Infectious and Parasitic Diseases | 1 | Acute infectious and parasitic diseases and poisoning |
| 2 | Chronic infectious and parasitic diseases (tuberculosis, HIV, hepatitis) | |
| Neoplasms | 3 | Neoplasms |
| Endocrine, Nutritional, and Metabolic Diseases and Immunity Disorders | 4 | Diabetes |
| 5 | Endocrine, metabolic and immunity disorders | |
| Diseases of Blood and Bloodforming Organs | 6 | Haematology |
| Mental Disorders | 7 | Acute mental disorders (i.e. psychosis) |
| 8 | Chronic mental disorders (i.e. rehabilitation programs, personality disorders) | |
| Diseases of the Nervous System and Sense Organs | 9 | Diseases of the nervous system |
| 10 | Eyecare | |
| 11 | Earcare | |
| Diseases of the Circulatory System | 12 | Cerebral hemorrhage and ischemia |
| 13 | Chronic cardiovascular disease (including congestive heart failure) | |
| 14 | Cardiovascular disease with intervention (PCI/CABG) | |
| Diseases of the Respiratory System | 15 | Acute diseases of the respiratory system (i.e. pneumonia and influenza) |
| 16 | Complex pulmonary surgery | |
| 17 | Common surgery of the respiratory system (i.e. tonsillitis) | |
| 18 | Chronic obstructive pulmonary disease and allied conditions | |
| Diseases of the Digestive System | 19 | Surgery of diseases of the digestive system |
| 20 | Diseases of oral cavity, salivary glands, and jaws | |
| Diseases of the Genitourinary System | 21 | Gynaecology |
| 22 | Urinary system | |
| Complications of Pregnancy, Childbirth, and the Puerperium | 23 | Complications of pregnancy, childbirth, and the puerperium |
| Diseases of the Skin and Subcutaneous Tissue | 24 | Dermatology |
| Diseases of the Musculoskeletal and Connective Tissue | 25 | Rheumatism and arthropathies (non surgical) |
| 26 | Diseases of the musculoskeletal system that require surgical treatment | |
| Congenital Anomalies | 27 | Congenital disorders |
| Newborn (Perinatal) | 28 | Certain conditions originating in the perinatal period |
| Injury and Poisoning | 29 | Emergency care (distorsion, luxation, common fractures) |
| 30 | Specialized trauma care (injuries of organs, complex fractures) | |
