This code system http://terminology.hl7.org/CodeSystem/benefit-term defines the following codes:

CodeDisplayDefinition
annual AnnualAnnual, renewing on the anniversary
day DayPer day
lifetime LifetimeFor the total term, lifetime, of the policy or coverage
<status value="draft"/><experimental value="false"/><description value="This value set includes a smattering of Benefit Term codes."/><copyright value="This is an example set."/><caseSensitive value="true"/><content value="complete"/><concept><code value="annual"/><display value="Annual"/><definition value="Annual, renewing on the anniversary"/></concept><concept><code value="day"/><display value="Day"/><definition value="Per day"/></concept><concept><code value="lifetime"/><display value="Lifetime"/><definition value="For the total term, lifetime, of the policy or coverage"/></concept></CodeSystem>