Is this the epitome of arrogance or "for real"

Location: Northern Virginia

The Dentist that I stopped going to around 2011 just sent me an invoice for $318, with an explanation that some new software they just installed came across this unsatisfied amount after insurance processes. It was never presented earlier as I generally pay everything on receipt of an invoice. Am I required to remit this or has time eroded the viability of the charge? / thx

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u/blhooray — 2 months ago