My mom has Medicare and Blue Cross. How do I get help with the cost of her assisted living rent?

gladimhere is correct and BCBS won't pay for AL either. Medicaid is your only answer. Every state's Medicaid is different, so talking to the social worker is a good starting point. If you are not already your mom's durable power of attorney, please get that in place as you will be helping her with the forms.

Medicare does not pay for assisted living, only as rehab if following a medical event and only for a limited period of time. Has mom applied for Medicaid? There may be help available there. Talk to the social worker at the facility.