This case-sensitive code system http://hl7.org/fhir/us/davinci-drug-formulary/CodeSystem/usdf-PharmacyBenefitTypeCS-TEMPORARY-TRIAL-USE defines the following codes:

Code	Display	Definition
1-month-in-retail	1 month in network retail	1 Month Supply via in-network retail pharmacy.
1-month-out-retail	1 month out of network retail	1 Month Supply via out-of-network retail pharmacy.
1-month-in-mail	1 month in network mail order	1 Month Supply via in-network mail order pharmacy.
1-month-out-mail	1 month out of network mail order	1 Month Supply via out-of-network mail order pharmacy.
3-month-in-retail	3 month in network retail	3 Month Supply via in-network retail pharmacy.
3-month-out-retail	3 month out of network retail	3 Month Supply via out-of-network retail pharmacy.
3-month-in-mail	3 month in network mail order	3 Month Supply via in-network mail order pharmacy.
3-month-out-mail	3 month out of network mail order	3 Month Supply via out-of-network mail order pharmacy.