| Code | Display | Definition |
| unplaced-text |
Words not placed |
Some words of the directions were not placed in any element. The structure does not hold the whole instruction: review it against the text. |
| as-directed |
As directed |
The directions defer to instructions given elsewhere. The structure holds only what is written here. |
| taper-not-structured |
Taper not structured |
The directions change the dose or the timing over time, as a taper or as steps one after another. Only the text is given. |
| concurrent-not-structured |
Several instructions not structured |
The directions give more than one dose or schedule at the same time. Only the text is given. |
| ambiguous-frequency |
Frequency unclear |
The directions state frequencies for one dose that disagree, so no timing is given. |
| discouraged-abbreviation |
Do Not Use abbreviation |
The directions use an abbreviation or a way of writing a dose that is on The Joint Commission's "Do Not Use" list. It was read with its usual meaning: confirm that this is what the prescriber meant. |
| dose-unit-missing |
Dose has no unit |
A dose amount was written without a unit, and none could be added from the medication. |
| unit-from-product |
Unit added from the product |
The dose's unit was not written. It was added from the medication's dose form. |
| unit-form-mismatch |
Unit and dose form differ |
The dose's unit does not match the medication's dose form. |
| route-from-product |
Route added from the product |
The route was not written. It was added from the medication's dose form, which is given only that way. |
| route-form-mismatch |
Route and dose form differ |
The route written is not the way the medication's dose form is given. Confirm that this is what the prescriber meant. |
| medication-not-held |
Medication not in RxNorm |
The medication's RxNorm code is not in the RxNorm release, so nothing about the product was used. |
| ndc-not-resolved |
NDC not used |
The medication was named only by an NDC, which is not yet resolved to a product, so nothing about the product was used. |
| medication-not-read |
Medication not read |
The medication was named only in code systems Structured Sig does not read, so nothing about the product was used. |
| dose-form-unknown |
No single dose form |
The medication's RxNorm code names no single dose form (an ingredient, a brand name or a pack, for example), so the dose could not be checked against the product. |
