The report said Mr Kirkman, who was 36, had a long history of paranoid schizophrenia and took his own life on 27 December 2023.
During the inquest, the coroner said the evidence revealed matters that caused him concern.
Prof Marks said that if a mental health screening assessment was carried out in one part of the country, the results and conclusions may not be immediately available elsewhere when a further assessment is carried out, due to the use of different IT systems.
“Absence of vital background information could result in an incorrect prioritisation for onward referral, as it did in this case,” he said.
The lack of availability of clinical information and data may “adversely influence subsequent assessments”, he said.
The coroner said NHS England had 56 days to respond with details of action taken or a proposed timetable of action.
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