This case-sensitive code system http://terminology.resmed.com/CodeSystem/resmed-settings-interface-code-system provides a fragment that includes following code:

CodeDisplay
MASK Mask
 <status value="draft"/> <experimental value="false"/> <date value="2024-01-11T18:32:48+00:00"/> <publisher value="ResMed Corp"/> <contact> <name value="ResMed Corp"/> <telecom> <system value="url"/> <value value="https://www.resmed.com"/> </telecom> <telecom> <system value="email"/> <value value="atomteam-halifax@resmed.com"/> </telecom> </contact> <description value="ResMed settings values for interface type (e.g. mask, cannula)"/> <jurisdiction> <coding> <system value="http://unstats.un.org/unsd/methods/m49/m49.htm"/> <code value="001"/> </coding> </jurisdiction> <caseSensitive value="true"/> <content value="fragment"/> <concept> <code value="MASK"/> <display value="Mask"/> </concept> </CodeSystem>