Drug Concept Classes Across Workflows

Different healthcare workflows require the use of different SNOMED CT drug model concept levels, depending on whether the focus is on clinical intent, real-world products, packaging, or aggregation.

This section summarizes how SNOMED CT concepts are typically bound to data elements across common use cases, ensuring consistent and safe interpretation of medication data.

Prescribing

Prescribing is typically based on Clinical Drugs (CD) to represent the intended medication. In some cases, prescribing may specify a brand (RCD) or a package (CDP/RPCD), depending on clinical or regulatory requirements.

Concept Class	Role	Example
CD	Generic prescribing	Amoxicillin 500 mg capsule
RCD	Brand prescribing	Brand X amoxicillin 500 mg capsule
CDP / RPCD	Package prescribing	Brand X amoxicillin box of 24

Dispensing

Dispensing translates the prescribed drug into a specific product (RCD) or packaged product (RPCD), reflecting what is actually supplied.

Concept Class	Role	Example
CD	Prescribed drug	Amoxicillin 500 mg capsule
RCD	Dispensed product	Brand X amoxicillin 500 mg capsule
RPCD	Dispensed package	Brand X amoxicillin box of 24

Medication Administration

Administration records the actual product (RCD) given to the patient. The Clinical Drug (CD) may be used for equivalence checks or clinical reasoning. The route is captured separately, typically using SNOMED CT qualifier values.

Concept Class	Role	Example
RCD	Product administered	Morphine injection BrandX
CD	Clinical equivalence	Morphine injection 10 mg/mL
Route	Administration route	Intravenous route

Inventory and Logistics

Inventory systems operate primarily at the package level (RPCD/CDP), while CD supports aggregation and reporting across products.

Concept Class	Role	Example
RPCD	Stock package	Brand X amoxicillin box of 24
CDP	Generic package	Amoxicillin box of 24
CD	Aggregation	Amoxicillin 500 mg capsule

Procurement

Procurement processes typically specify requirements using CDs, allowing suppliers to respond with RCDs and associated packaged products (RPCDs).

Concept Class	Role	Example
CD	Tender requirement	Amoxicillin 500 mg capsule
RCD	Supplier product	Brand X amoxicillin capsule
RPCD	Packaged offer	Brand X amoxicillin box

Reimbursement

Reimbursement rules may apply at different levels of abstraction, from ingredient (MP) to form (MPF) to specific strength (CD).

Concept	Role	Example
MP	Ingredient coverage	Metformin
MPF	Form coverage	Metformin tablet
CD	Strength coverage	Metformin 500 mg tablet

Clinical Decision Support

Clinical decision support operates across multiple levels, depending on the rule:

• MP for interactions

• MPF for form-specific logic

• CD for dose validation

Concept Class	Role	Example
MP	Interaction rules	Warfarin
MPF	Form-specific rules	Insulin injectable
CD	Dose rules	Paracetamol 500 mg

Adverse Drug Reaction Reporting

Adverse event reporting may require different levels of detail, from specific product (RCD) to generic drug (CD) or ingredient (MP), depending on data availability and reporting requirements.

Concept Class	Role	Example
RCD	Specific product	Brand X amoxicillin
CD	Generic drug	Amoxicillin 500 mg
MP	Ingredient	Amoxicillin

Analytics and Reporting

Analytics typically uses MP and MPF for aggregation, with CD enabling more detailed analysis when needed.

Concept Class	Role	Example
MP	Aggregation	Insulin
MPF	Form analysis	Injectable insulin
CD	Detailed analysis	Insulin glargine

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