Do I need to file an amended return if I forgot to enter Medicare B premiums. When I put it in post submission, it made no difference to Fed or California bottom line.

I did enter the Social security income correctly, only left out the Medicare B premiums amount.   When I post filing-submission made the inputs, It made no difference in the bottom line amounts calculated by TurboTax for either Federal or California state taxes, thus do not think it matters and do not need to submit an amended return.  Is this correct?