You're probably seen press releases about the recent LabCorp $14M DOJ fine related to urine tox testing.
There are some sources that go into numbing detail about the coding situations and the coding definitions and overlap. First link is DOJ press release; second link is 11p court document.
https://www.justice.gov/opa/pr/labcorp-agrees-pay-145m-resolve-false-claims-act-allegations
https://www.justice.gov/opa/media/1452616/dl
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