Retirement tax questions

If your wife's former employer is paying 90% of your Medicare Advantage premiums, and this comes to $18,000/year, then the premiums must be $20,000/year. This is an astonishingly high number for Medicare Advantage premiums, which usually run to less than (often much less than) $300/month. Or is the $18,000 a typo for $1,800?

 

Did your wife receive a W-2 or a 1099-R for the payment made for the Medicare Advantage premiums? If so, which one, and what was on it?