There is a +/-10% leeway built into the calculation for case ascertainment. If only one or two patients have opted out via the national data opt out, a team's case ascertainment should not be affected.
If your team has had a large number of opt-outs during a reporting period and the number of cases has fallen more than 10% below the expected number of cases, SSNAP may be able to adjust the expected number of cases. Where this applies teams are encouraged to contact the SSNAP helpdesk as soon as possible.
Evidence of the total number of stroke cases coded as I61, I63 and I64 should be provided for a minimum of three months. This coded data is ordinarily supplied by the team's information or coding department. Any patient that has opted out should be removed from this list and the team should provide a figure for the numbers of eligible patients that have opted out.
Please make sure the data provided contains the ICD-10 code and the admission and/or discharge date for the patient. Please do not send any patient identifiable information, including NHS number, name, address, GP details, etc.
All coded data must be sent by the data-locking deadline. It is not possible to change the expected figure after the deadline has passed.