| Code | Display | Definition |
| expired | Past Expiration Date | Vaccine Dose Administered was administered after the Lot Number Expiration Date |
| tooyoung | Patient Too Young | Vaccine Dose Administered was administered at too young of an age |
| tooold | Patient Too Old | Vaccine Dose Administered was administered at too old of an age |
| inappropriate | Inappropriate Vaccine | Vaccine Dose Administered was an inappropriate vaccine (e.g. vaccine not licensed for the patient age) |
| toosoon | Administered Too Soon | Vaccine Dose Administered was administered too soon following a previous dose |
| productconflict | Product Conflict | Vaccine Dose Administered was administered too close to another vaccine or other product (e.g. Immune Globulin conflict or live virus conflict) |
| quantity | Insufficient Quantity | Vaccine Dose Administered amount was less than the recommended amount |
| recall | Recalled Product | Vaccine Dose Administered was recalled by the manufacturer |
| storage | Adverse Storage Conditions | Vaccine Dose Administered experienced adverse storage conditions (e.g. cold chain break) |
| notevaluated | Not Evaluated | Vaccine Dose Administered was not evaluated |