CMP Dataset Version 4.0

ICNARC Case Mix Programme Dataset Version 4.0

We are now in the process of releasing an update to the CMP Dataset, taking us from the current Version 3.1 to Version 4.0.


The headline aims for the new dataset are:

  • Evolution not revolution;
  • Simplify data collection wherever possible;
  • Further improve risk modelling;
  • Align with standards (e.g. GPICS - Guidelines for the Provision for Intensive Care Services);
  • Reflect current practice.


Dataset consultation is complete. This has been an extensive process and has included the following groups:

  • ICS/FICM Joint Standards Committee;
  • NHS England Adult Critical Care Specialty Group;
  • National Adult Critical Care Data Group; and, most importantly
  • CMP participating critical care units.


David Harrison, our Head Statistician, provided an update on the new Dataset at the ICNARC CMP Annual Meeting 2019 on 1 May, and the slides from this presentation are available under the Related Files on this page.

The first specification documents have been released to CMP software developers, and the process of developing and releasing documentation will continue throughout the summer and autumn. Please see the provisional timetable for the transition to V4.0 below. 


We will be keeping everyone informed of progress, including on the release of documents and unit training, through newsletters and updates, and this page will be your hub for information.

Please bookmark this page (Ctrl+D) to ensure you can easily access the latest updates.

Queries can be sent to


Provisional timetable for transition from CMP Dataset Version 3.1 to Version 4.0


25 April 2019

Webinar presented to CMP Software Developers introducing initial V4.0 specification documents and timeline for development

1 May 2019

V4.0 update presented by David Harrison at ICNARC CMP Annual Meeting 2019 (see Related Files)

7 May 2019

Field Specification and Dataset Flow Diagrams released to CMP Software Developers

June 2019

Technical Specification and further development documents to be released to CMP Software Developers

Summer 2019

ICNARC working on documentation and training tools for units, including CMP V4.0 Data Dictionary

30 September 2019

Final documents released to CMP Software Developers, including CMP V4.0 Data Dictionary

1 October 2019

Software Developers can begin testing their Version 4.0 test data extracts by uploading to Platform X

Winter 2019

Software Developers continue testing V4.0 data extracts until all checks are passed & software is certified V4.0 compliant (once compliant, units using the application will be able to transition to new Dataset)

1 January 2020

Potential start date for first CMP units to begin V4.0 Data Collection

1 January 2021

Final date for all participating units to have transitioned from V3.1 and be collecting V4.0 Dataset