| Code | Display | Definition |
| = |
= |
Used to match a value according to FHIR Search rules (e.g., Patient/123, Encounter/2002). |
| eq |
Equal |
The value for the parameter in the resource is equal to the provided value. |
| ne |
Not Equal |
The value for the parameter in the resource is not equal to the provided value. |
| gt |
Greater Than |
The value for the parameter in the resource is greater than the provided value. |
| lt |
Less Than |
The value for the parameter in the resource is less than the provided value. |
| ge |
Greater Than or Equal |
The value for the parameter in the resource is greater or equal to the provided value. |
| le |
Less Than or Equal |
The value for the parameter in the resource is less or equal to the provided value. |
| sa |
Starts After |
The value for the parameter in the resource starts after the provided value. |
| eb |
Ends Before |
The value for the parameter in the resource ends before the provided value. |
| ap |
Approximately |
The value for the parameter in the resource is approximately the same to the provided value. Note that the recommended value for the approximation is 10% of the stated value (or for a date, 10% of the gap between now and the date), but systems may choose other values where appropriate. |
| above |
Above |
The search parameter is a concept with the form [system]|[code], and the search parameter tests whether the coding in a resource subsumes the specified search code. |
| below |
Below |
The search parameter is a concept with the form [system]|[code], and the search parameter tests whether the coding in a resource is subsumed by the specified search code. |
| in |
In |
The search parameter is a member of a Group or List, or the search parameter is a URI (relative or absolute) that identifies a value set, and the search parameter tests whether the value is present in the specified Group, List, or Value Set. |
| not-in |
Not In |
The search parameter is a member of a Group or List, or the search parameter is a URI (relative or absolute) that identifies a value set, and the search parameter tests whether the value is NOT present in the specified Group, List, or Value Set. |
| of-type |
Of Type |
The search parameter has the format system|code|value, where the system and code refer to a Identifier.type.coding.system and .code, and match if any of the type codes match. All 3 parts must be present. |