This code system http://terminology.hl7.org/CodeSystem/service-provision-conditions defines the following codes:

CodeDisplayDefinition
free FreeThis service is available for no patient cost.
disc Discounts AvailableThere are discounts available on this service for qualifying patients.
cost Fees applyFees apply for this service.
 <status value="draft"/> <experimental value="false"/> <date value="2020-04-09T21:10:28+00:00"/> <publisher value="HL7 (FHIR Project)"/> <contact> <telecom> <system value="url"/> <value value="http://hl7.org/fhir"/> </telecom> <telecom> <system value="email"/> <value value="fhir@lists.hl7.org"/> </telecom> </contact> <description value="The code(s) that detail the conditions under which the healthcare service is available/offered."/> <caseSensitive value="true"/> <valueSet value="http://terminology.hl7.org/ValueSet/service-provision-conditions"/> <content value="complete"/> <concept> <code value="free"/> <display value="Free"/> <definition value="This service is available for no patient cost."/> </concept> <concept> <code value="disc"/> <display value="Discounts Available"/> <definition value="There are discounts available on this service for qualifying patients."/> </concept> <concept> <code value="cost"/> <display value="Fees apply"/> <definition value="Fees apply for this service."/> </concept> </CodeSystem>