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Yes you can! As per NYS guidelines you can change your Medicare supplement/Medigap at any time…
No waiting periods or exclusions, provided you had credible coverage without a lapse of 63 days or longer.
You can find the full write up by clicking this link.
Can I change my Medicare Supplement at any time in NY?
The short answer is no, but there’s a big BUT.
If you elect to not have a drug plan you will be subject to a life time Medicare Penalization; of 1% of the average Drug Plan premium, for each month you do not have a Drug Plan!
This is called an LEP or Late Enrolment Penalty and also make it so you would be unable to obtain a Drug Plan until the next Annual Enrolment period with an effective date of Jan 1st.
You can find more information by clicking this link.