This case-sensitive code system http://terminology.hl7.org/CodeSystem/financialtaskcode defines the following codes:
Code
Display
Definition
cancel
Cancel
Cancel or reverse a resource, such as a claim or preauthorization, which is in-process or complete.
poll
Poll
Retrieve selected or all queued resources or messages.
release
Release
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.
reprocess
Reprocess
Indication that the processing of a resource, such as a claim, for some or all of the required work is now being requested.
status
Status check
Check on the processing status of a resource such as the adjudication of a claim.