Checking my last day of health coverage - first time posting

I was told my coverage ends on my last day, but the letter says the end of the month. I would rather hear the honest version than the polite one. The letter is unclear about dental and vision. What should I do about appointments?

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

Keep a copy of any coverage confirmation in case of later disputes.