I think that comma is optional, but the sentence is better without it, and there is a different comma missing. "If necessary" can be thought of as parenthetical or not as you choose, necessitating or obviating the comma, but it looks fussy. "
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In the sentence below, is a comma necessary following "as needed" at the end of the sentence?
I disagree with you experts. What if you put "as necessary" at the beginning of the sentence. You would defintely add the comma. Right? Then I say, it belongs there when added to the end of the statement for the same reason. It is a conditional statement.