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Caveat, not an agent.A number of companies require those turning 65 to sign up for medicare and their insurance with the company changes at that age. Regardless of what you think it is legal to do that. Yes there are likely guidelines they have to follow, but that does not change it is legal to require that.
Note - I am not required to answer all your questions. I'd suggest talk to your HR office if you have questions about this and how it works. There are many variations about what companies do when employees turn 65, are fully retired...
No, you are not required to answer my questions. However your comments indicate you do not fully understand Medicare Coordination of Benefits rules and Employer Health coverage requirements for Large (over 20) companies.
In relation to OP's original post, if the large group employer is requiring over 65 employees, or their family members over 65, to go on Parts A and B of Medicare in order to retain health care coverage from active employment, there is a significant potential problem there. The employer is treating over 65 and under 65 employees differently. The stage is also possibly being set for an insurance carrier to attempt to treat Medicare as primary, rather than secondary, for claims.
OP's post did not indicate they were asking about Employer Retiree Health coverage, but if they were, then yes, the employer could probably require Medicare enrollment because Medicare would be primary to the Employer Retiree Health Plan.
There are probably some specialized situations where those general rules would not apply, but those are the general rules expressed in CMS documents, and by agents, in recurring discussions on site about this issue.
There also used to be HHS documents covering this, I am no longer able to relocate them with searches.