ORGANISATION SITE IDENTIFIER (OF TREATMENT) is the ORGANISATION SITE IDENTIFIER of the ORGANISATION SITE where the PATIENT was treated, i.e. it should enable the treating ORGANISATION to be identified.

ORGANISATION SITE IDENTIFIER (OF TREATMENT) identifies the ORGANISATION SITE within the ORGANISATION on which the PATIENT was treated, since facilities may vary on different hospital sites.

The code recorded should always be the national code; if the treatment is sub-commissioned to another NHS Health Care Provider or an independent UK provider, the ORGANISATION SITE IDENTIFIER (OF TREATMENT) used should be the ORGANISATION SITE IDENTIFIER of the Health Care Provider actually carrying out the work.

Where treatment is sub-commissioned to an overseas provider the Organisation Data Service Default Code 89997 'Non-UK Provider where no ORGANISATION SITE IDENTIFIER has been issued' is applicable.

Each ORGANISATION has a unique ORGANISATION SITE IDENTIFIER. However, where an ORGANISATION has more than one site from which it provides SERVICES, then each site is uniquely identified. These sites are ORGANISATION SITES and are uniquely identified by an ORGANISATION SITE IDENTIFIER.

For out-patients, ACTIVITY may take place outside the hospital, such as in the PATIENT'S home; in such cases, raising a site code is impractical. Therefore, code R9998 'Not a hospital site' would be used in these circumstances.
Note: LOCATION CLASS is used in the Commissioning Data Set (CDS) message to indicate the physical LOCATION within which the ACTIVITY occurred. 

Use in the Future Outpatient CDS:
If the INTENDED SITE CODE (OF TREATMENT) is not known, this data element should be omitted.

SITE CODE (OF TREATMENT) will be replaced with ORGANISATION SITE IDENTIFIER (OF TREATMENT), which is the most recent approved national information standard to describe the required definition.

This data element is also known by these names:

Context	Alias
plural	ORGANISATION SITE IDENTIFIERS (OF TREATMENT)