This code system http://hl7.org/fhir/event-resource-types defines the following codes:

Code	Display	Definition
ChargeItem	ChargeItem	Item containing charge code(s) associated with the provision of healthcare provider products.
ClaimResponse	ClaimResponse	Remittance resource.
ClinicalImpression	ClinicalImpression	A clinical assessment performed when planning treatments and management strategies for a patient.
Communication	Communication	A record of information transmitted from a sender to a receiver.
Composition	Composition	A set of resources composed into a single coherent clinical statement with clinical attestation.
Condition	Condition	Detailed information about conditions, problems or diagnoses.
Consent	Consent	A healthcare consumer's policy choices to permits or denies recipients or roles to perform actions for specific purposes and periods of time.
Coverage	Coverage	Insurance or medical plan or a payment agreement.
DeviceUseStatement	DeviceUseStatement	Record of use of a device.
DiagnosticReport	DiagnosticReport	A Diagnostic report - a combination of request information, atomic results, images, interpretation, as well as formatted reports.
DocumentManifest	DocumentManifest	A list that defines a set of documents.
DocumentReference	DocumentReference	A reference to a document.
Encounter	Encounter	An interaction during which services are provided to the patient.
EnrollmentResponse	EnrollmentResponse	EnrollmentResponse resource.
EpisodeOfCare	EpisodeOfCare	An association of a Patient with an Organization and Healthcare Provider(s) for a period of time that the Organization assumes some level of responsibility.
ExplanationOfBenefit	ExplanationOfBenefit	Explanation of Benefit resource.
FamilyMemberHistory	FamilyMemberHistory	Information about patient's relatives, relevant for patient.
GuidanceResponse	GuidanceResponse	The formal response to a guidance request.
ImagingStudy	ImagingStudy	A set of images produced in single study (one or more series of references images).
Immunization	Immunization	Immunization event information.
MeasureReport	MeasureReport	Results of a measure evaluation.
Media	Media	A photo, video, or audio recording acquired or used in healthcare. The actual content may be inline or provided by direct reference.
MedicationAdministration	MedicationAdministration	Administration of medication to a patient.
MedicationDispense	MedicationDispense	Dispensing a medication to a named patient.
MedicationStatement	MedicationStatement	Record of medication being taken by a patient.
Observation	Observation	Measurements and simple assertions.
PaymentNotice	PaymentNotice	PaymentNotice request.
PaymentReconciliation	PaymentReconciliation	PaymentReconciliation resource.
Procedure	Procedure	An action that is being or was performed on a patient.
ProcessResponse	ProcessResponse	ProcessResponse resource.
QuestionnaireResponse	QuestionnaireResponse	A structured set of questions and their answers.
RiskAssessment	RiskAssessment	Potential outcomes for a subject with likelihood.
SupplyDelivery	SupplyDelivery	Delivery of bulk Supplies.
Task	Task	A task to be performed.