Table 2.
Distribution of ICD-9-CM codes according to disease categories.
| Disease categories | Percentage (%) |
|---|---|
| Disorders of conjunctiva | 41.32 |
| Disorders of refraction and accommodation | 15.57 |
| Disorders of eyelids and orbits | 9.01 |
| Disorders of lens | 8.54 |
| Disorders of cornea | 4.71 |
| Trauma | 3.94 |
| Disorders of retina | 3.12 |
| Disorders of lacrimal system | 2.67 |
| Glaucoma | 2.66 |
| Others, unclassified including vitreous disorders | 1.7 |
| Disorders of uvea (choroid, iris, ciliary body) | 0.43 |
| Disorders of globe | 0.29 |
| Strabismus and other disorders of binocular eye movements | 0.18 |
| Disorders of optic nerve and visual pathway | 0.12 |
| Blindness and low vision | 0.04 |
| Total percentage | 94.3 |