When does my employer coverage actually end?, graphic designer here

I was told my coverage ends on my last day, but the letter says the end of the month. I do not want to be surprised by a bill. What should I do about appointments?

Ask HR to confirm the exact date in writing. I also called the insurance company to double-check.

Thanks for writing this out. I went through something close to it last year, and it got easier once I kept a simple log of every call and form.