Two of the most overcrowded hospitals last month were in the South East.
Over 10,000 admitted patients were forced to wait without hospital beds in January 2019, according to a new monthly analysis by the INMO.
The figures represent a 55% increase on the number of patients waiting for beds in January 10 years ago and a 30% increase on January five years ago.
Among the 10,350 patients were 190 children.
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The worst affected hospitals in the South East were South Tipperary General and University Hospital Waterford.
The worst affected hospitals nationwide were UHL with 970 patients, followed by Cork University Hospital with 947.
