This value set includes codes based on the following rules:

• Include these codes as defined in urn:oid:2.16.840.1.114222.4.5.274 version 20200526

  Code	Display
  PHC1514	Filtering piece/N95
  PHC1515	N or P 95 cartridges (Elastomeric - half face or full face)
  PHC1516	N or P 99 or 100 cartridges (Elastomeric - half face or full face)
  PHC1517	Other cartridges (Elastomeric - half face or full face)

• Include these codes as defined in http://snomed.info/sct version http://snomed.info/sct/731000124108/version/20200901

  Code	Display
  262001002	No respiratory protective equipment was used
  409528009	Surgical mask

• Include these codes as defined in http://terminology.hl7.org/CodeSystem/v3-NullFlavor version 20090501

  Code	Display
  OTH	other
  UNK	unknown