Table 2.
Comorbid retinal conditions before cataract surgery
| Condition (ICD-9) | Cases | Controls |
|---|---|---|
| N | 2,003 | 76,946 |
| Diabetes | 26.0% | 23.1% |
| Diabetic retinopathy | 8.3% | 3.7% |
| Background (362.01) | 3.3% | 1.9% |
| Proliferative (362.02) | 1.4% | 0.6% |
| Nonproliferative (362.03) | 0.4% | 0.2% |
| Mild nonproliferative (362.04) | 0.7% | 0.3% |
| Moderate nonproliferative (362.05) | 0.4% | 0.1% |
| Severe nonproliferative (362.06) | 0.1% | 0.0% |
| Multiple diabetic retinopathy diagnoses | 1.9% | 0.6% |
| Epiretinal membrane | 8.4% | 3.6% |
| Retinal vein occlusion | 3.9% | 0.7% |
| Two or more conditions listed previouslya | 14.0% | 2.5% |
| None of the conditions listed previously | 39.3% | 66.3% |
Notes:
a
All patients with diabetic retinopathy were also assumed to have diabetes (even if it was not expressed in claims). This refers to other combinations of conditions.
Abbreviation: ICD-9, International Classification of Diseases, Ninth Edition.