This code system http://terminology.hl7.org/CodeSystem/media-modality defines the following codes:

Code Display Definition
diagram Diagram A diagram. Often used in diagnostic reports
fax Fax A digital record of a fax document
scan Scanned Document A digital scan of a document. This is reserved for when there is not enough metadata to create a document reference
retina Retina Scan A retinal image used for identification purposes
fingerprint Fingerprint A finger print scan used for identification purposes
iris Iris Scan An iris scan used for identification purposes
palm Palm Scan A palm scan used for identification purposes
face Face Scan A face scan used for identification purposes
<status value="draft"/> <experimental value="false"/> <date value="2025-09-13T16:38:45-04:00"/> <publisher value="Orders and Observations"/> <contact> <name value="Orders and Observations"/> <telecom> <system value="url"/> <value value="http://www.hl7.org/Special/committees/orders"/> </telecom> </contact> <description value="Detailed information about the type of the image - its kind, purpose, or the kind of equipment used to generate it."/> <jurisdiction> <coding> <system value="http://unstats.un.org/unsd/methods/m49/m49.htm"/> <code value="001"/> <display value="World"/> </coding> </jurisdiction> <copyright value="This resource includes content from SNOMED Clinical Terms® (SNOMED CT®) which is copyright of the International Health Terminology Standards Development Organisation (IHTSDO). Implementers of these specifications must have the appropriate SNOMED CT Affiliate license - for more information contact http://www.snomed.org/snomed-ct/get-snomed-ct or info@snomed.org"/> <caseSensitive value="true"/> <content value="complete"/> <concept> <code value="diagram"/> <display value="Diagram"/> <definition value="A diagram. Often used in diagnostic reports"/> </concept> <concept> <code value="fax"/> <display value="Fax"/> <definition value="A digital record of a fax document"/> </concept> <concept> <code value="scan"/> <display value="Scanned Document"/> <definition value="A digital scan of a document. This is reserved for when there is not enough metadata to create a document reference"/> </concept> <concept> <code value="retina"/> <display value="Retina Scan"/> <definition value="A retinal image used for identification purposes"/> </concept> <concept> <code value="fingerprint"/> <display value="Fingerprint"/> <definition value="A finger print scan used for identification purposes"/> </concept> <concept> <code value="iris"/> <display value="Iris Scan"/> <definition value="An iris scan used for identification purposes"/> </concept> <concept> <code value="palm"/> <display value="Palm Scan"/> <definition value="A palm scan used for identification purposes"/> </concept> <concept> <code value="face"/> <display value="Face Scan"/> <definition value="A face scan used for identification purposes"/> </concept> </CodeSystem>