Benefits end date after a layoff after 18 years as a graphic designer

I am not sure what date my benefits stop after being let go as a graphic designer. The letter is unclear about dental and vision. What should I do about appointments?

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

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.