The MHMDS is a regular return of data generated by providers of adult secondary mental health services in England, in the course of delivering services to patients. From Q1 2011/12 onwards, the MHMDS also includes data from Independent Sector Organisations and is processed using the new system. Full details of the methods used in processing can be found in the MHMDS Version 4 User Guidance and Appendices (see related links).
The MHMDS dataset is received by the HSCIC as record level anonymised data from patient administration systems, Care Programme Approach systems and Mental Health Act administration systems.
Changes to this publication
From April 2013 the submission of MHMDS data will be made every month, rather than every quarter, to support the implementation of Payment by Results for mental health. From April 2013 there are also NHS wide changes as a result of the Health and Social Care Act 2012. As a result, the frequency and content of this publication will be changing after the publication of Q4 2012/13 Final data. We are currently consulting on changes to data quality measures (see Related link below). Further details will be provided in a Methodological Change Paper to be made available on this web site (https://digital.nhs.uk/data-and-information/find-data-and-publications/statement-of-administrative-sources/methodological-changes ) in early 2013.