Mental Health Minimum Data Set (MHMDS)

Agreements naming it

227

In term in September 2026

37

Organisations

67

Files released

967

Files released counts only files released externally by DARS. Access granted in NHS England's own systems, such as its Secure Data Environment, is not included.

How the register describes it

Recorded against the dataset on each agreement, and not always the same from one agreement to the next, so every value found is listed.

Type of data

• Anonymised - ICO Code Compliant
• Identifiable

Sensitivity

• Non-Sensitive
• Sensitive

Frequency of release

• Frequent Adhoc Flow
• One-Off
• Ongoing

Legal basis for provision

• CV19: Regulation 3 (4) of the Health Service (Control of Patient Information) Regulations 2002
• Health and Social Care Act 2012 - s261 - 'Other dissemination of information'
• Health and Social Care Act 2012 - s261(5)(d)
• Health and Social Care Act 2012 – s261(2)(a)
• Health and Social Care Act 2012 – s261(2)(b)(ii)
• Health and Social Care Act 2012 – s261(2)(c)
• Health and Social Care Act 2012 – s261(4)
• Health and Social Care Act 2012 – s261(7)

5 more

• Informed Patient consent to permit the receipt, processing and release of data by NHS Digital
• National Audit Act 1983
• National Health Service Act 2006 - s251 - 'Control of patient information'.
• Other-National Audit Act 1983
• Other-Regulation 3 of the Health Service (Control of Patient Information)

Organisations whose agreements name it (67)

Agreements covering this dataset

Showing all 227 agreements.

Files: files of this dataset released under the agreement, across all its versions.

No longer in the register (1)

Agreements naming this dataset that earlier editions listed and the September 2026 edition does not. Each page shows what the register last said. None is counted in this site's figures.