The Mental Health Minimum Dataset (MHMD) concerns adult patients (including elderly) who receive care in NHS specialist mental health services. This care is delivered within a Mental Health Care Spell. For some patients care will comprise a small number of out-patient attendances over a few weeks. For others, it may extend over many years and include hospital, community, out-patient and day care attendances which may commonly overlap.
The MHMD is assembled and produced for a defined period of time known as the Reporting Period (which may be monthly, quarterly or annually) and comprises a data set record for each Mental Health Care Spell which occurs wholly or partially within the Reporting Period.