TABLE I.
Search algorithm for potential cases of anaphylaxis after vaccination
| Adverse event | ICD-9 codes | Postvaccination observation window (d)* |
Medical setting | First episode in what period? |
|
|---|---|---|---|---|---|
| Primary screen | Anaphylaxis | 995.0, 999.4 | 0-2 | Outpatient, inpatient, ED | First in 2 d |
|
| |||||
| E codes | E948.0-948.9 E949.0-949.9 | 0 | Outpatient, inpatient, ED | First in 2 d | |
|
| |||||
| Secondary screen | Allergic reactions | 995.1, 995.3, 708.0, 708.1, 708.9, 695.1, 995.20, 995.21, 995.27, 995.29 |
0 | Outpatient, inpatient, ED | First in 42 d |
E codes, External cause of injury codes.
*
Day 0 represents day of vaccination.