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What gives? Page 24 of your reference:
Part B and Group Health Plan Coverage from
an Employer or Union
Your Part B enrollment rights can be affected if you have coverage through an employer (including FEHBP) or union, and you or your spouse is still working.
When the employment ends, three things happen:
You may get a chance to elect COBRA coverage, which
continues your health coverage through the employer's plan
(in most cases for only 18 months) and probably at a higher
cost to you.
You may get a special enrollment period to sign up for Part B
without a penalty. This period only lasts for 8 months after
your employment ends. This period will run whether or not
you elect COBRA, so if you wait until your COBRA ends, your
special enrollment period will probably be over.
If you sign up for Part B, it will also start a 6-month Medigap open enrollment period which gives you a guaranteed right to buy a Medigap (Medicare Supplement Insurance) policy. Once this period starts, it also can't be delayed or repeated.
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What did I say that contradicts this?
You said that one gets this 6 month period at anytime they sign up for part B. In this case, it's only because of the situation listed.
Do you not understand context?