Table 1.
Diagnosis codes for study exposures, outcomes, and covariates according to the International Classification of Diseases, Eighth and Tenth Revisions (ICD‐8 and ICD‐10)
| ICD‐8 codes | ICD‐10 codes | |
|---|---|---|
| Exposure | ||
| Retinal vein thrombosis | 377.08 | DH348 |
| Outcome | ||
| Cancer | 140‐209 | C00‐C99 |
| Covariates | ||
| Diabetes | 24900, 24906, 24907, 24909, 25000, 25006, 25007, 25009 | E10‐E14 (except E102, E112, E142). O24 (except O24.4), G63.2, H36.0, N08.3 |
| Atrial fibrillation or atrial flutter | 42793, 42794 | I48 |
| Myocardial infarction | 410 | I21 |
| Heart failure | 42709, 42710, 42711, 42719, 42899, 78249 | I50.0, I50.1, I50.2, I50.3, I50.8, I50.9, I11.0, I13.0, I13.2, I42.0, I42.7, I42.8, I42.9 |
| Lower‐extremity deep venous thrombosis or pulmonary embolism | 45100, 45099 | I80.1‐3, I26 |
| Chronic renal disease | 249.02, 250.02, 753.10‐753.19, 582, 583, 584, 590.09, 593.20, 792 | E10.2, E11.2, E14.2, N03, N05, N11.0, N14; N16, N18‐N19, N26.9, Q61.1‐Q61.4 |
| Chronic pulmonary disease | 490‐493; 515‐518 | J40‐J47; J60‐J67; J68.4; J70.1; J70.3; J84.1; J92.0; J96.1; J98.2; J98.3 |
| Obesity | 277 | E65‐E68 |
| Alcoholism‐related disorders | 980, 291.09‐291.99, 303.09‐303.99, 57109‐57111, 57710 | F10 (except F10.0), G31.2, G62.1, G72.1, I42.6, K29.2, K86.0, Z72.1 |
| Risk factors for venous thromboembolism | ||
| Fracture/trauma | 800‐929, 950‐959 | S00‐T14 |
| Surgery | N/A | Previous Danish classification until 1996:000000‐99960; NOMESCO classification after 1996: KA‐KQ, KX, KY |
| Pregnancy | 630‐680 | O00‐O99 |