| Code | Description | Comment | Version |
| A | Asynchronous | Do the next specification in parallel with this one (unless otherwise constrained by the following fields: TQ1-7-start date/time and TQ1-8-end date/time). The conjunction of "A" specifies two parallel instructions, as are sometimes used in medication, e. | added v2.4 |
| C | Actuation Time | It will be followed by a completion time for the service. This code allows one to distinguish between the time and priority at which a service should be actuated (e.g. blood should be drawn) and the time and priority at which a service should be complet | added v2.4 |
| S | Synchronous | Do the next specification after this one (unless otherwise constrained by the following fields: TQ1-7-start date/time and TQ1-8-end date/time). An "S" specification implies that the second timing sequence follows the first, e.g. when a service request is | added v2.4 |