1099-nec, retirement, and health insurance premiums

My company agreed to pay my health insurance premiums after I retired.  However, I recently received a 1099-NEC from my company for the amount paid for the premiums in 2020  I suppose I could deduct the premiums as a medical deduction; however, it was my understanding that health insurance premiums paid by my past employer after I retired are not taxable income.  If it is not taxable income, do I simply ignore the amount on the 1099-NEC?  Moreover, if it is taxable income, I question if a 1099-NEC should have been issued, instead of a 10999-MISC.