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- Data capture vs Data retrieval subsets:
Subsets may be used for data capture (eg, used by a physician at the point of care in an EMR to record a procedure or service provided) or for data retrieval (eg, used by a physician for retrieving information about patients who have received a specific set of procedures or services). In some cases, the content in these types of subsets may differ.
- Physician specialty vs Electronic health system-specific field subset
Subsets may be developed for physician specialties or sub-specialties (eg, cardiology or interventional cardiology) or for a more general use case (eg, immunizations, Evaluation and Management). For example, the cardiology physician specialty subset should include all procedures and services a cardiologist may conduct or perform, while an immunizations subset should contain a list of all immunization procedures and will not be limited to one physician specialty; it may be used by a general practitioner or a pediatrician to record immunizations done.
- Intensional vs Extensional subsets SNOMED CT Example
Subsets can be developed intensionally or extensionally. The term “extensional subsets” refers to explicitly enumerating each and every code and/or Clinician Descriptor. On the other hand, the term “intensional subsets” refers to specifying the sections/hierarchies and/or subheadings that contain content that is to be included in a subset.
- Concept/Code Subsets vs Clinician Descriptions Subsets
Subsets can be developed at the code/term level or at the Clinician Descriptors level.
Clinician Descriptor's (CDs) purpose is to clearly and specifically describe precisely the procedure or service performed by a physician/doctor or qualified healthcare professional at the point of care. Clinician Descriptors will also reflect the granularity necessary to describe clinically relevant information. As a result, many existing codes will be mapped to more than one CD. These CDs will be easily understandable to the physicians/doctors or other qualified healthcare professionals who have little or no knowledge of coding and are primarily concerned with the clinical representation of the data rather than other aspects of the data e.g. the administrative or claim reimbursement.
Clinician Descriptors are more specific services or procedures that are included in the catalogues such as the Ontario Schedule of Benefits .
These subsets types can be created by many methods, but here are a few commonly used:
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