Checking my last day of health coverage - 4 months and counting

I am not sure what date my benefits stop after being let go as an insurance claims processor. There are 4 people counting on me, so I am trying to be careful. The letter is unclear about dental and vision. How did you confirm your end date?

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.