As a retired nurse, and my benefits include a Medicare Supplement given to me in the form of a 1099Misc. Would this be a Sch C or Sch E? Or another form of income?

As a retired nurse, my benefits include Medicare Supplement income in the form of a 1099Misc through my retirement company as a paying agent paying for my previous employer/hospital. Where would I declare this income? In a SchC (with what business code?), SchE, or another location?