Improper joinder clarified, maybe.

Alleging that a toe joint implant did not work properly, Flagg sued “Manufacturing Defendants” (who built the implant) and “Medical Defendants” (who surgically installed it in Flagg’s foot.)  The Manufacturing Defendants were diverse from Flagg,  a Louisiana citizen, while the Medical Defendants were not.

Affirming the district court while reversing the panel, an 11-4 en banc opinion holds “the plaintiff had improperly joined the non-diverse defendants because [he] has not exhausted his claims against those parties as required by statute.”  That Louisiana statute requires review by a “medical review panel” before suit is filed against a health care provider; the Fifth Circuit concluded that pursuant to it, “there is no doubt that the state court would have been required to dismiss the Medical Defendants from the case,” as no such review had occurred at the time of removal.  A vigorous dissent raised questions about the Court’s standard for analyzing claims of improper joinder, as well as whether this kind of state statute (“a non-adjudicative, non-comprehensive, waivable process since concluded in this case”) was a proper foundation for an improper joinder claim.  Flagg v. Stryker Corp., No. 14-31169 (March 24, 2016) (en banc).