Checking my last day of health coverage (Milwaukee)

HR said my health plan continues for a bit and I do not understand how. I do not usually post, so bear with me. The letter is unclear about dental and vision. Did coverage match what HR said?

Dental and vision sometimes end on a different date from medical. Mine did.

Thanks for writing this out. I went through something close to it 2 months ago, and it got easier once I kept a simple log of every call and form.