Hi,
He stopped by the hospital. He said Mark told him about Tina being hit by a car and wanted to check in.
What does 'check in' mean? In this context, it seems like it means 'get admitted to the hospital as a patient'.
However, the usual idom is 'check himself in'.
The sentence is unclearly written. I'm not sure whether it's Mark or the other man who wants to check in. Or even Tina?
Best wishes, Clive