This code system http://terminology.hl7.org/CodeSystem/financialtaskcode defines the following codes:

CodeDisplayDefinition
cancel CancelCancel or reverse a resource, such as a claim or preauthorization, which is in-process or complete.
poll PollRetrieve selected or all queued resources or messages.
release ReleaseRelease any reserved funds or material obligations associated with a resource. For example, any unused but reserved funds or treatment allowance associated with a preauthorization once treatment is complete.
reprocess ReprocessIndication that the processing of a resource, such as a claim, for some or all of the required work is now being requested.
status Status checkCheck on the processing status of a resource such as the adjudication of a claim.
 <status value="draft"/> <experimental value="false"/> <date value="2022-09-14T03:23:03-06:00"/> <publisher value="Financial Management"/> <contact> <telecom> <system value="url"/> <value value="http://hl7.org/fhir"/> </telecom> </contact> <description value="This value set includes Financial Task codes."/> <copyright value="This is an example set."/> <caseSensitive value="true"/> <valueSet value="http://terminology.hl7.org/ValueSet/financial-taskcode"/> <content value="complete"/> <concept> <code value="cancel"/> <display value="Cancel"/> <definition value="Cancel or reverse a resource, such as a claim or preauthorization, which is in-process or complete."/> </concept> <concept> <code value="poll"/> <display value="Poll"/> <definition value="Retrieve selected or all queued resources or messages."/> </concept> <concept> <code value="release"/> <display value="Release"/> <definition value="Release any reserved funds or material obligations associated with a resource. For example, any unused but reserved funds or treatment allowance associated with a preauthorization once treatment is complete."/> </concept> <concept> <code value="reprocess"/> <display value="Reprocess"/> <definition value="Indication that the processing of a resource, such as a claim, for some or all of the required work is now being requested."/> </concept> <concept> <code value="status"/> <display value="Status check"/> <definition value="Check on the processing status of a resource such as the adjudication of a claim."/> </concept> </CodeSystem>