Table 4.
Selected commonly used OHIP outpatient diagnostic billing codes in 71 patients with confirmed NF1 and 28,409 clinical encounters
| Codes | Description | Frequency | Percent of codes |
|---|---|---|---|
| 999 | No diagnosis | 9838 | 34.6 |
| 304 | Drug dependence/drug addiction | 1216 | 4.3 |
| 709 or | Other disorders of skin and subcutaneous tissue | 822 | 2.9 |
| 216 or | Dermatofibroma, pigmented nevus | ||
| 173 | Other skin malignancies | ||
| 787 | Anorexia/nausea and vomiting | 605 | 2.1 |
| 781 | Leg cramps, pain (muscle, joints) | 372 | 1.3 |
| 300 | Anxiety, depression | 347 | 1.2 |
| 192 | Malignant tumours of the nervous system outside of brain | 278 | 1.0 |
| 349 | Other diseases of the central nervous system | 266 | 0.9 |
| 401 | Essential hypertension | 241 | 0.9 |
| 758 | Autosomal anomalies, chromosomal anomalies | 141 | 0.5 |
| 225 | Benign tumours of the nervous system | 102 | 0.4 |
| 191 | Malignant brain tumours | 98 | 0.3 |
| 759 | Other congenital anomalies | 95 | 0.3 |
| 313 | Behaviour disorders of childhood and adolescence | 60 | 0.2 |
| 315 | Developmental delay | 45 | 0.2 |
Codes 709, 216 and 173 all represent common skin-related issues in NF1, and therefore were combined for these analyses