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

Code Display Definition
annual Annual Annual, renewing on the anniversary
day Day Per day
lifetime Lifetime For 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>