This case-sensitive code system http://hl7.org/fhir/us/davinci-drug-formulary/CodeSystem/usdf-DrugTierCS-TEMPORARY-TRIAL-USE defines the following codes:
Code
Display
Definition
generic
Generic
Commonly prescribed generic drugs that cost more than drugs in the ‘preferred generic’ tier.
preferred-generic
Preferred Generic
Commonly prescribed generic drugs.
non-preferred-generic
Non-preferred Generic
Generic drugs that cost more than drugs in ‘generic’ tier.
specialty
Specialty
Drugs used to treat complex conditions like cancer and multiple sclerosis. They can be generic or brand name, and are typically the most expensive drugs on the formulary.
brand
Brand
Brand name drugs that cost more than ‘preferred brand’ drugs.
preferred-brand
Preferred Brand
Brand name drugs
non-preferred-brand
Non-preferred Brand
Brand name drugs that cost more than ‘brand’ drugs.
zero-cost-share-preventative
Zero cost-share preventative
Preventive medications and products available at no cost.
medical-service
Medical Service
Drugs that must be administered by a clinician or in a facility and may be covered under a medical benefit.