What's the best health insurance to sign up for? Doc at mom's memory care told me plan F with AARP, but plan F is not available in 2020.

I'm in CA and right now she has SCAN and Medicare, but doc says it doesn't cover everything. I want vision, dental, hospice, everything covered. She pays virtually nothing right now, but with plan F it would be $450/mo. he says. What is the best health coverage available and what does your parent have? I'm doing her reenrollment Tuesday. Thank you for any ideas!