Pre-MDC: AR-DRG by Patient Type (day patient and in-patient).The MDC is a category generally based on a single body system or aetiology that is associated with a particular medical specialty. DRGs are clusters of cases with similar clinical attributes and resource requirements. In Ireland, Australian Refined Diagnosis Related Group (AR-DRG) have been in use in Ireland since 2005, in 2015 Version 6.0 was used to group discharges. Activity in Acute Public Hospitals in Ireland Annual Report, 2015, is a report on in-patient and day patient discharges from acute public hospitals participating in the Hospital In-Patient Enquiry (HIPE) scheme in 2015. Discharge activity is examined by type of patient (day patient/in-patient), admission type (elective/emergency/maternity) and hospital group, and by demographic parameters (such as age and sex). Particular issues of relevance to the Irish health care system covered in the report relate to the composition of discharges by medical card and public/private status. Discharges are also analysed by diagnoses, procedures, major diagnostic categories, and diagnosis related groups. The analysis is presented at the national level. In 2015 HIPE discharges were coded using ICD-10-AM/ACHI/ACS 8th Edition and grouped into AR-DRG Version 6.0. See the complete Activity in Acute Public Hospitals in Ireland Annual Report 2015 at http://www.hpo.ie/latest_hipe_nprs_reports/HIPE_2015/HIPE_Report_2015.pdf