New Definition of "Chutzpah"

From a discussion among FPs about undercoding:

Granted that we should all be accurately coding all of our services all of the time, nevertheless the question came up about Medicare fining us for undercoding. Was this possible, in that undercoding would seem to cost Medicare less?

Never underestimate Medicare:

A physician coded the wrong joint for injection (minor joint instead of major) and Medicare came along two years later and wanted a refund of their incorrect (lower) payment. It was then too late for [the physician] to bill the correct code/service.

I have now officially seen it all.