This case-sensitive code system http://hl7.org/fhir/us/davinci-pcde/CodeSystem/PCDEtempCodes defines the following codes in an undefined heirarchy:

Lvl	Code	Display	Definition
1	pcde	Coverage Transition Document	A document that details information related to transitioning coverage from one payor to another.
1	_section
2	activeTreatment	Active Treatments	A section detailing information about ongoing, current, active treatments.
2	treatment	Treatment	A sub-section detailing treatment information.
2	priorCoverage	Prior Coverage	A sub-section detailing current active prior authorizations.
2	supportingInfo	Supporting Information	A sub-section detailing previous observations and therapies that support the current treatment.
2	otherDocumentation	Other Document	A section detailing additional information deemed relevant to the transfer of care.