This code system http://fhir.kisimdocs.ch/ig/KisimScheduling/CodeSystem/appointment-service-category defines the following codes:

CodeDisplayDefinition
OPERATION OperationAppointment of type Operation.
KONS SprechstundeAppointment of type Sprechstunde.
SPERRE SperreAppointment of type Sperre.
DIENST DienstAppointment of type Dienst.
RES ReservationAppointment of type Reservation.
 <status value="active"/> <date value="2022-10-05T16:49:12+02:00"/> <publisher value="Cistec AG"/> <contact> <name value="Cistec AG"/> <telecom> <system value="url"/> <value value="https://www.cistec.com"/> </telecom> <telecom> <system value="email"/> <value value="robert.birri@cistec.com"/> </telecom> </contact> <description value="ServiceRequest category codes"/> <content value="complete"/> <count value="5"/> <concept> <code value="OPERATION"/> <display value="Operation"/> <definition value="Appointment of type Operation."/> </concept> <concept> <code value="KONS"/> <display value="Sprechstunde"/> <definition value="Appointment of type Sprechstunde."/> </concept> <concept> <code value="SPERRE"/> <display value="Sperre"/> <definition value="Appointment of type Sperre."/> </concept> <concept> <code value="DIENST"/> <display value="Dienst"/> <definition value="Appointment of type Dienst."/> </concept> <concept> <code value="RES"/> <display value="Reservation"/> <definition value="Appointment of type Reservation."/> </concept> </CodeSystem>