This code system http://terminology.hl7.org/CodeSystem/payment-type defines the following codes:

CodeDisplayDefinition
payment PaymentThe amount is partial or complete settlement of the amounts due.
adjustment AdjustmentThe amount is an adjustment regarding claims already paid.
advance AdvanceThe amount is an advance against future claims.
 <status value="draft"/> <experimental value="false"/> <date value="2021-12-02T19:54:18-07:00"/> <publisher value="Financial Management"/> <contact> <telecom> <system value="url"/> <value value="http://hl7.org/fhir"/> </telecom> </contact> <description value="This value set includes sample Payment Type codes."/> <copyright value="This is an example set."/> <caseSensitive value="true"/> <valueSet value="http://terminology.hl7.org/ValueSet/payment-type"/> <content value="complete"/> <concept> <code value="payment"/> <display value="Payment"/> <definition value="The amount is partial or complete settlement of the amounts due."/> </concept> <concept> <code value="adjustment"/> <display value="Adjustment"/> <definition value="The amount is an adjustment regarding claims already paid."/> </concept> <concept> <code value="advance"/> <display value="Advance"/> <definition value="The amount is an advance against future claims."/> </concept> </CodeSystem>