It's not terribly hard to find cases, even within just the Obama administration, of DOJ going after big hospitals.

A few months ago, the federal prosecutor in Georgia announced a $513 million settlement against the Tenet hospital chain for charges of bribery and fraud: https://www.justice.gov/opa/pr/hospital-chain-will-pay-over-...

The fed prosecutor in DC managed to extract $12.9M in settlements from the D.C. Children's Hospital based on a whistleblower complaint last year: https://www.justice.gov/opa/pr/childrens-hospital-pay-129-mi...

I admit, in casual Google searches, I didn't find any case in which Ortiz's office took on an area hospital. But I did find quite a few cases where her office hit pharmaceutical companies quite hard:

https://www.justice.gov/usao-ma/pr/cvs-pay-35-million-resolv...

https://www.justice.gov/usao-ma/pr/pharmaceutical-executives...

https://archives.fbi.gov/archives/boston/press-releases/2012...

https://www.justice.gov/usao-ma/pr/wyeth-and-pfizer-agree-pa...

https://www.fbi.gov/contact-us/field-offices/boston/news/pre...

Strange world in which Pfizer and CVS are "the little people who speak truth to power" only to be crushed by the DOJ.