I know that if you are fired, your insurance remains covered for 30 days, is it still covered if you quit?
Answer: Federal law dictates that you hold the option to buy into your company's strength insurance plan for up to 60 days after termination, whether it be voluntary (quit) or involuntary (fired or laid off). The catch is that it's usually at an extraordinarily giant amount, and unless you get into an twist of fate, it's generally cheaper to risk not have insurance. This insurance should be effective for up to 120 days (I believe...)
Also, check with your company's policy, but I believe that you can build that coverage retroactive during those 60 days (in case of fluke or major illness), even if you choose not to verbs on your insurance through COBRA.
Read details on the attached link for more information.
I believe that as long as your premium is rewarded you remain covered for that month. My husband left a mission last year for a better one and this be the case beside him. He was competent to get a much needed surgery done since he started the new opportunity and the surgery was perform a couple weeks after he left the weak job. And if truth be told...he could have kept that insurance if he continued to pay cheque the premium but his new brief offered better coverage after the first 90 days. Your best bet would be to talk to Human Resources for your company ( if it have such a dept. ) and ask them. Or call the company your insurance is from. Hope this help!!