This code system http://terminology.hl7.org/CodeSystem/testscript-operation-codes defines the following codes:
| Code | Display | Definition |
| read | Read | Read the current state of the resource. |
| vread | Version Read | Read the state of a specific version of the resource. |
| update | Update | Update an existing resource by its id. |
| updateCreate | Create using Update | Update an existing resource by its id (or create it if it is new). |
| patch | Patch | Patch an existing resource by its id. |
| delete | Delete | Delete a resource. |
| deleteCondSingle | Conditional Delete Single | Conditionally delete a single resource based on search parameters. |
| deleteCondMultiple | Conditional Delete Multiple | Conditionally delete one or more resources based on search parameters. |
| history | History | Retrieve the change history for a particular resource or resource type. |
| create | Create | Create a new resource with a server assigned id. |
| search | Search | Search based on some filter criteria. |
| batch | Batch | Update, create or delete a set of resources as independent actions. |
| transaction | Transaction | Update, create or delete a set of resources as a single transaction. |
| capabilities | Capabilities | Get a capability statement for the system. |
| apply | $apply | Realizes an ActivityDefinition in a specific context |
| closure | $closure | Closure Table Maintenance |
| find-matches | $find-matches | Finding Codes based on supplied properties |
| conforms | $conforms | Compare two systems CapabilityStatements |
| data-requirements | $data-requirements | Aggregates and returns the parameters and data requirements for a resource and all its dependencies as a single module definition |
| document | $document | Generate a Document |
| evaluate | $evaluate | Request clinical decision support guidance based on a specific decision support module |
| evaluate-measure | $evaluate-measure | Invoke an eMeasure and obtain the results |
| everything | $everything | Return all the related information as described in the Encounter or Patient |
| expand | $expand | Value Set Expansion |
| find | $find | Find a functional list |
| graphql | $graphql | Invoke a GraphQL query |
| implements | $implements | Test if a server implements a client's required operations |
| lastn | $lastn | Last N Observations Query |
| lookup | $lookup | Concept Look Up and Decomposition |
| match | $match | Find patient matches using MPI based logic |
| meta | $meta | Access a list of profiles, tags, and security labels |
| meta-add | $meta-add | Add profiles, tags, and security labels to a resource |
| meta-delete | $meta-delete | Delete profiles, tags, and security labels for a resource |
| populate | $populate | Populate Questionnaire |
| populatehtml | $populatehtml | Generate HTML for Questionnaire |
| populatelink | $populatelink | Generate a link to a Questionnaire completion webpage |
| process-message | $process-message | Process a message according to the defined event |
| questionnaire | $questionnaire | Build Questionnaire |
| stats | $stats | Observation Statistics |
| subset | $subset | Fetch a subset of the CapabilityStatement resource |
| subsumes | $subsumes | CodeSystem Subsumption Testing |
| transform | $transform | Model Instance Transformation |
| translate | $translate | Concept Translation |
| validate | $validate | Validate a resource |
| validate-code | $validate-code | ValueSet based Validation |