Categories for the coding of illnesses
| Code | Affected system | Main symptom(s) | Cause of illness/symptom(s) |
|---|---|---|---|
| 1 | Respiratory/ear, nose, throat | Fever | Pre-existing (eg, asthma, allergy) |
| 2 | Gastro-intestinal | Pain | Infection |
| 3 | Uro-genital/gynaecological | Diarrhoea, vomiting | Exercise-induced |
| 4 | Cardio-vascular | Dyspnoea, cough | Environmental |
| 5 | Allergic/immunological | Palpitations | Reaction to medication |
| 6 | Metabolic/endocrinological | Hyper-thermia | Other |
| 7 | Haematological | Hypo-thermia | |
| 8 | Neurological/psychiatric | Dehydration | |
| 9 | dermatologic | Syncope, collapse | |
| 10 | Musculo-skeletal | Anaphylaxis | |
| 11 | Dental | Lethargy, dizziness | |
| 12 | Other | Other |