When does my employer coverage actually end? (Oklahoma City)

HR said my health plan continues for a bit and I do not understand how. I have been trying to stay organised about it. The letter is unclear about dental and vision.

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 14 months ago, and it got easier once I kept a simple log of every call and form.