It was also suggested to me that it could be a type of Blastomussa that is very unhappy. I have blastos and I'm not so sure I agree with that assessment.
Kurt this is what I found for the coral you listed. Doesn't really look like it to me. This coral looks more like the way a bubble coral might grow. Anyway here is the link to it.
Heterocyathus Aequicostatus
While searching and looking at pics I found this to be a possibility as well. Keep in mind that your coral is stressed and bleached and working on coming back so don't focus on the color. It's possible it is
Galaxea fascicularis The polyp structure is similar to some extent. I would photograph the coral you have every couple of days to document the changes it goes through.
I agree with Kurt that it's probably not Pseudosiderastrea tayami, each poly shares a wall as he mentioned and yours have clearly defined polyp structure. I think as the coral gets happy again an shows some color we might be able to figure out what it is. It was also suggeted to me that you present it with some mysis to see if it reacts by extending feeder tentacles. Just a thought...I'm still looking.....