This value set includes codes based on the following rules:

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

  Code	Display	Definition
  UNK	unknown	**Description:**A proper value is applicable, but not known. **Usage Notes**: This means the actual value is not known. If the only thing that is unknown is how to properly express the value in the necessary constraints (value set, datatype, etc.), then the OTH or UNC flavor should be used. No properties should be included for a datatype with this property unless: 1. Those properties themselves directly translate to a semantic of "unknown". (E.g. a local code sent as a translation that conveys 'unknown') 2. Those properties further qualify the nature of what is unknown. (E.g. specifying a use code of "H" and a URL prefix of "tel:" to convey that it is the home phone number that is unknown.)

• Include these codes as defined in http://terminology.hl7.it/sid/istat-unitaAmministrativeTerritoriali

  Code	Display
  01	Piemonte
  02	Valle d'Aosta/Vallée d'Aoste
  03	Lombardia
  04	Trentino-Alto Adige/Südtirol
  05	Veneto
  06	Friuli-Venezia Giulia
  07	Liguria
  08	Emilia-Romagna
  09	Toscana
  10	Umbria
  11	Marche
  12	Lazio
  13	Abruzzo
  14	Molise
  15	Campania
  16	Puglia
  17	Basilicata
  18	Calabria
  19	Sicilia
  20	Sardegna

This value set contains 21 concepts