Full disclosure, this is an example. I had an Aetna HMO plan in 2024. (previous years I was in UHC HMO plans) It was fantastic. Aetna even bought me three Pickleball paddles and an Apple Watch.

they also in the last three months of 2024 paid for every single test without question. This included a PSMA PET scan, biopsies, consultations with local specialists and consultation with a panel of doctors up at Duke University cancer clinic, a 3 Hour drive from my home, my wife and I stayed in a hotel the night before. The three doctors, one from each of the respective fields spent the entire morning with both my wife and I just to consult with us on treatment options, to give you the caliper of the people. One of those doctors was the director of research at the cancer clinic all paid for by my Aetna HMO plan.
However, toward the end of 2024 I was notified that plan was being canceled so for the heck of it since at that point I knew I had cancer. I went into Medigap plan N for 2025.
2025 is almost over, my cancer treatments, mostly all successfully completed and at this point 80% sure I will go back to an advantage plan in 2026. I have a couple more weeks to make up my mind.