How to Find Medical Groups Contracted with City of Hope on Blue Shield HMO?

I'm currently on the Blue Shield of California Platinum 90 Trio HMO plan and was hoping to visit City of Hope hospital. However, it seems that my current medical group doesn't have a direct contract with them. On the City of Hope website, they list Blue Shield of California as an in-network provider, so I believe switching to a medical group that contracts with them might solve the issue. Could anyone guide me on how to find out which medical groups have a contract with City of Hope? Thanks in advance!