Checking my last day of health coverage after 11 years as a production planner

I was told my coverage ends on my last day, but the letter says the end of the month. There are 11 people counting on me, so I am trying to be careful. I have an appointment next week. How did you confirm your end date?

Dental and vision sometimes end on a different date from medical. Mine did.

I moved my appointments earlier while coverage was active. It saved me a bill.