In the recently published proposed rule related to the CY 2018 Hospital Outpatient Prospective Payment System (OPPS), the Centers for Medicare & Medicaid Services (CMS) announced that it is considering changes to the regulation governing the date of service (DOS) for clinical laboratory and pathology specimens.  The DOS rules are important to laboratories and hospitals because they dictate which party must bill Medicare for certain laboratory testing performed on stored specimens collected during a hospital procedure but ordered after the patient has left the hospital.  If revisions are ultimately finalized, the proposal could have significant business implications for independent laboratories and hospitals.

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