Switch back to Medicare with Supplement Plan?

My dad's just turned 65 this April (2023) and chose Medicare Advantage. I've heard he has 1 year "trial" to switch back to traditional Medicare with a Supplement Plan without going medical underwriting so we're running some numbers to see if it's better to switch back. Please let me know if my understand is correct.

He has just been diagnosed with stage 4 lung cancer so he'll need chemotherapy and immunotherapy. With his current MA, it's $325/day for inpatient stay ($0 after 7 days) and outpatient is $325. So he'll get chemo and immunotherapy at the Oncology clinic every 3 weeks, so total yearly cost would be:

$164.9 (part B premium) * 12 + $0 (MA premium) + $325 (outpatient) * 18 (every 3 weeks) + $260 (drug deductible) = $8088.8

With Medicare + Supplement plan G, he only needs to pay $226 part B deductible, so his cost would be

Traditional Medicare + Supplement plan G + part D

$164.9 * 12 + $150 (plan G) * 12 + 0 (outpatient) + $30 (part D) * 12 + $505 (part D deductible) = $4643.8

Is my calculation correct?

submitted by /u/minhtuanta
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