Yes, he can enroll using his Special Election Period.
Medicare Supplement Plan is an insurance plan that helps it's beneficiary to obtain some discounts in health related services rendered to them.
The Medicare Supplement Plan is different from other Medicare plans as it gives the beneficiary an opportunity to predict their medical costs.
The beneficiary on the Medicare Supplement Plan has a right to a free period called Special Election Period which gives the beneficiary the opportunity to enroll in other plans such as Chronic Special Needs Plan (C-SNP) that covers his chronic condition.
Therefore, Mr John who is currently in a Medicare Supplement Plan can enroll in a Chronic Special Needs Plan (C-SNP) that covers his chronic condition.
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