No, if you were covered under a plan that qualifies for the Premium Tax Credit (what you are calling the premium subsidy) you would receive a 1095-A. If you received a 1095-B or 1095-C you do not need to enter it for your tax returns because there is no additional benefit you can claim.
The amendment filing deadline is 3 years from the date you filed your return.
Per the IRS:
Generally, to claim a refund, you must file Form 1040-X within 3 years after the date you filed your original return or within 2 years after the date you paid the tax, whichever is later. Returns filed before the due date (without regard to extensions) are considered filed on the due date, and withholding is deemed to be tax paid on the due date.
@Xtermy
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