COMMISSIONING DATA SETS (CDS)
Although EDIFACT messages had previously been developed for Commissioning Minimum Data Sets (CMDS), the NHS-wide Clearing Service (NWCS) implementation required a single EDIFACT message capable of carrying all local variations of all CMDSs.
Before such an EDIFACT message could be produced it was necessary to remodel all CMDSs to conform to a single structure. In addition, it was necessary to include flow control information required by the NWCS processes.
The resultant, extended CMDSs, are referred to as the Commissioning Data Sets (CDS), for further information please refer to the current version of The NHS CDS Manual.
The CDS is the basic structure used for the exchange of commissioning data between Providers and Commissioners (and other users) via the NWCS. The CDS design is capable of individually conveying many different CDS structures encompassing Accident and Emergency Attendances, Out-Patient Attendances, Admitted Patient Care and Elective Admission List data. CDS Messages have been defined in component parts known as CDS Type. Each CDS Type as configured into the CDS Message carries only one CDS, examples being one finished General Consultant Episode CDS Type etc.
The CDS also allows the transfer of additional, locally defined information in what are termed 'Very General Purpose Data Segments' (VGPs), please refer to the current version of The NHS CDS Manual for the rules and constraints when using VGPs.
How CDS Types are transmitted
Many CDS Messages may be physically transmitted together as an EDI Interchange. The inclusion of particular CDS Messages in any one EDI Interchange is subject to grouping rules.
The NHS-wide Clearing Service
The NHS-wide Clearing Service (NWCS) was established to accept CDS Messages from Providers for onward transmission to Commissioners and to be copied to other recipients.
In order to meet the Hospital Episode Statistics (HES) requirements and to provide Value Added Services for its users, the NWCS maintains a central database of all valid CDS Messages received.
The adoption and use of the NWCS for the exchange of Admitted Patient Care CDS data was mandated for all NHS Organisations in an Executive Letter, EL/95/139 issued in December 1995 and is a component of the 'Information for Health' strategy.
The Mandated CDS Flows
The NWCS supports all CDS Types but only a subset are mandated to flow via the NWCS, the minimum CDS data flow requirement to enable HES and Payment by Results to be supported by NWCS is:
|-||All Admitted Patient Care Finished Episodes are to be passed via the NWCS. This includes Out of Area Treatments, Home Birth and Home Delivery Episodes|
|-||As at midnight on 31 March each year, all Unfinished Consultant Episodes which are not included in the Detained and/or Long-Term Psychiatric Census, must be sent to the NWCS|
|-||All Unfinished Episodes qualifying for inclusion in the Detained and/or Long-Term Psychiatric Census as at midnight 31 March each year must be sent to the NWCS|
|-||Out-Patient Attendance Commissioning Data Sets were mandated to flow via the NWCS from 1st October 2001, see DSCN 05/2001. Nurse and Midwife attendances and Ward Attendances for nursing care were mandated to be carried on the Out-Patient Attendance CDS from 1 April 2005, see DSCN 32/2004.|
|-||Accident and Emergency Attendance Commissioning Data Sets were mandated to flow nationally from 1st April 2005, see DSCN 32/2004.|
For further information please refer to the current version of The NHS CDS Manual.