This code system http://terminology.hl7.org/CodeSystem/immunization-funding-source defines the following codes:

CodeDisplayDefinition
private PrivateThe vaccine was purchased with private funds.
public PublicThe vaccine was purchased with public funds.
<status value="draft"/> <experimental value="false"/> <date value="2022-11-04T18:21:49-06:00"/> <publisher value="FHIR Project team"/> <contact> <telecom> <system value="url"/> <value value="http://www.hl7.org/Special/committees/pher/index.cfm"/> </telecom> </contact> <description value="The value set to instantiate this attribute should be drawn from a terminologically robust code system that consists of or contains concepts to support describing the source of the vaccine administered. This value set is provided as a suggestive example."/> <caseSensitive value="true"/> <valueSet value="http://terminology.hl7.org/ValueSet/immunization-funding-source"/> <content value="complete"/> <concept> <code value="private"/> <display value="Private"/> <definition value="The vaccine was purchased with private funds."/> </concept> <concept> <code value="public"/> <display value="Public"/> <definition value="The vaccine was purchased with public funds."/> </concept> </CodeSystem>