Supporting hierarchy - Disposition

This Editorial Guide is used for Education Purposes Only. It is used in the Authoring Courses and Certifications. It is based on the January 2026 Editorial Guide.

Overview

The hierarchy, 726711005 |Disposition (disposition)|, was created to support the remodeling of the Substance hierarchy. The concepts in this hierarchy are used as the attribute value for the |Has disposition (attribute)| for concepts in the Substance hierarchy, to sufficiently define grouper concepts representing dispositions, and to sufficiently define concepts in other SNOMED CT hierarchies. To provide adequate context to differentiate concepts in this hierarchy from similar concepts in other existing SNOMED CT hierarchies, a new (disposition) semantic tag was created.

Modeling

The following words should be avoided unless specifically identified as an exception in the editorial guidelines.

• agent

• analog

• and

• and/or

Exceptions:

• Alkylating agent (disposition)

• Chelating agent (disposition)

• receptor agonist or partial agonist

• receptor antagonist or partial antagonist

• enzyme inhibitor or enzyme system inhibitor

• enzyme activator

Patterns:

• X receptor agonist (disposition)

• X receptor antagonist (disposition)

• X inhibitor (disposition)

• X activator (disposition)

Example of receptor agonist:

• Dopamine receptor agonist (disposition)

• Opioid receptor agonist (disposition)

• Opioid receptor partial agonist (disposition)

Example of receptor antagonist:

• Beta-adrenergic receptor antagonist (disposition)

• Histamine receptor antagonist (disposition)

• Opioid receptor antagonist (disposition)

• Opioid receptor partial antagonist (disposition)

Example of inhibitor (enzyme):

• Acetylcholinesterase inhibitor (disposition)

• Phosphodiesterase 5 inhibitor (disposition)

Example of inhibitor (enzyme system):

• Hydrogen/potassium adenosine triphosphatase enzyme system inhibitor (disposition)

• Selective serotonin reuptake inhibitor (disposition)

Example of activator:

• Plasminogen activator (disposition)

Patterns:

• X receptor agonist

• X receptor antagonist

• X inhibitor

• X activator

Example of receptor agonist:

• Dopamine receptor agonist

• Opioid receptor agonist

Example of receptor antagonist:

• Beta-adrenergic receptor antagonist

• Histamine receptor antagonist

• Opioid receptor antagonist

Example of enzyme inhibitor:

• Acetylcholinesterase inhibitor

• Phosphodiesterase 5 inhibitor

• Centrally acting acetylcholinesterase inhibitor

Example of enzyme system inhibitor:

• Proton pump inhibitor

• Selective serotonin reuptake inhibitor

Example of enzyme inducer:

• Plasminogen activator

Exceptions:

• Preferred terms may reflect the common clinical description for a disposition.

  • Example:

    • |Hydrogen/potassium adenosine triphosphatase enzyme system inhibitor (disposition)| has Preferred Term |Proton pump inhibitor|

    • |3-Hydroxy-3-methylglutaryl-coenzyme A reductase inhibitor (disposition)| has Preferred Term |HMG-CoA reductase inhibitor|

Synonyms are not allowed unless explicitly identified as an exception.

Pattern:

• X (disposition)

Example:

• Growth factor (disposition)

• Cytokine (disposition)

• Carcinogen (disposition)

• Potassium channel blocker (disposition)

Pattern:

• X

Example:

• Growth factor

• Cytokine

• Carcinogen

• Potassium channel blocker

Synonyms are not allowed unless explicitly identified as an exception.

Pattern:

• X (disposition)

Example:

• Alkylating agent (disposition)

• Chelating agent (disposition)

Pattern:

• X

Example:

• Alkylating agent

• Chelating agent

Synonyms are not allowed unless explicitly identified as an exception.

The following illustrates the stated and inferred view: