AR-DRG complexity split for total discharges by Patient Type (day patient and in-patient). A complexity split indicator that ranks DRGs within adjacent DRGs on the basis of their level of complexity/resource use. It is either 'A', 'B', 'C', 'D' or 'Z' with 'A' being the most complex or 'Z' indicating that there is no complexity split. The complexity of the case is determined by particular variables, such as the presence of complications and/or comorbidities (cc), age, or discharge status, which influence the treatment process and/or the pattern of resource utilisation. 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