Can I be with my client when her husband has open heart surgery at the hospital?

My clients husband had open heart surgery the other day and i was in the hospital with my client. And my office knew I was there and so did the care coordinator and they all said that it was find to service my client there and the yesterday I got a call from my HR person saying that I wasn't supposed to do that and I've got to come into the office on Tuesday to talk to HR and for retraining. I've been with the company almost 4 yrs.