Prepare 0.4.0: DGDA Drug and LOINC Integration

input/fsh/codeSystems/BDDGDADrugCS.fsh

@@ -0,0 +1,33 @@
+CodeSystem: BDDGDADrugCS
+Id: dgda-drug-registry
+Title: "DGDA Drug Registry Code System"
+Description: """
+Code system representing the Drug Registration Authority (DGDA) of Bangladesh's
+official drug registry. Concepts are maintained in the national OCL terminology
+server at https://tr.ocl.dghs.gov.bd and are not enumerated within this
+Implementation Guide.
+
+This code system contains two concept classes:
+- **Drug**: Finished pharmaceutical drug products (identified by DAR number and trade name)
+- **Ingredient**: Raw material / active pharmaceutical ingredients
+
+Concept IDs follow the format: `{DAR-number}--{trade-name-slug}`
+Example: `353-0026-039--marvelous-fe`
+
+**Canonical URL note:** `https://dgda.gov.bd/drug-registry` is a logical identifier
+only and does not resolve to a web endpoint.
+"""
+
+* ^url = "https://dgda.gov.bd/drug-registry"
+* ^version = "v1.0.0"
+* ^status = #active
+* ^experimental = false
+* ^publisher = "Directorate General of Drug Administration (DGDA), Government of Bangladesh"
+* ^contact.name = "DGHS Health Informatics Unit"
+* ^contact.telecom.system = #url
+* ^contact.telecom.value = "https://dghs.gov.bd"
+* ^jurisdiction = urn:iso:std:iso:3166#BD "Bangladesh"
+* ^content = #not-present
+* ^count = 39196
+* ^caseSensitive = true
+* ^valueSet = "https://dgda.gov.bd/fhir/ValueSet/registered-drugs"