• vcard
D 312.463.6310
F 312.893.2165
  • Education
    • J.D., Northwestern University School of Law, 1989, Northwestern University's Journal of International Law and Business, Editorial Board
    • B.A., cum laude, Colgate University, 1986
  • Court Admissions
    • U.S. District Court, Northern District of Illinois
    • U.S. Court of Appeals, Third Circuit
    • U.S. Court of Appeals, Seventh Circuit

Mary Clare Bonaccorsi serves as outside general counsel and trusted business adviser to health care and life sciences companies. Those clients include domestic and international medical equipment suppliers, specialty pharmacies, home care providers, home infusion providers, hospice providers, pharmacy benefit managers, academic medical centers, hospitals and health systems, ambulatory surgery centers, dialysis providers and pharmaceutical manufacturers.
As the Health Care Litigation practice chair, Mary Clare works closely with clients' legal and operational teams to devise and implement litigation avoidance strategies and provides counsel on operational, regulatory and compliance matters. She previously served as Deputy General Counsel to a publicly-traded home infusion provider and understands the importance of having a deep and practical understanding of clients' business operations and goals. She has successfully tried cases before judges and juries in state and federal courts throughout the country in cases involving shareholder disputes, breach of contract claims, unfair competition, Lanham Act, business torts and False Claims Act/qui tam claims. Mary Clare also handles government and commercial payor disputes, audits and investigations. 
She utilizes a number of alternative dispute resolution mechanisms to resolve business disputes and takes a practical and holistic approach to solving clients' problems. Mary Clare chose the legal profession as a way to devote her time and skills to assist others and spends considerable time on pro bono matters. She is also a frequent industry speaker and author.

  • Successfully defended a PBM in claims brought by Medicaid Managed Care Organization (MCO) for breach of contract, obtaining full payment of withheld payments from MCO and negotiating termination of business relationship.
  • Represented home medical equipment supplier in appeal of CMS revocation of license for alleged failure to comply with supplier standards. Succeeded in having CMS rescind revocation and full reinstatement of DME supplier client's license.
  • Represented national provider of infusion services in a commercial payor dispute. After exhausting administrative appeals, filed for arbitration and negotiated a settlement that reduced amount claims to less than 15 percent of total claimed overpayment amount and negotiated for the provider client a more favorable business relationship with payor on a going-forward basis.
  • Successfully defended multiple health care companies in qui tam lawsuits brought under the federal False Claims Act.
  • Achieved dismissal of lawsuit brought against client for hiring senior sales executive and full settlement of all claims without any monetary payment by client.
  • First-chaired two-week trial on behalf of ambulatory surgery center in a dispute with a former shareholder. Obtained jury verdict in client's favor, which was upheld by Arizona Court of Appeals.
  • Successfully defended action brought by individual shareholders and surgery center LLC in action alleging breach of contract and breach of fiduciary duty. Obtained settlement for client on counterclaims and buyout of client's management contract and surgery center ownership interest in an amount substantially in excess of the expert valuation of management contract and ownership interest.
  • Represented defendant hospital in Bryant v Glen Oaks Medical Center f/k/a Glendale Heights Community Hospital (May 12, 1995) – Illinois Appellate Court, for alleged breach of contract and wrongful termination of pathologist's medical staff privileges. Obtained summary judgment order dismissing case by the trial court. Drafted and argued appeal that resulted in a landmark decision in Illinois affirming a hospital's right to provide exclusive contracts to hospital-based providers.
  • Obtained reduction beyond 90 percent of alleged overpayments in government payor audit of DME supplier client.
  • Obtained a walk-away settlement on the eve of arbitration brought against client by an MCO.
Publications & Presentations
PolsinelliFCA.com Blog
June 16, 2016
eAlerts Alerts
May 6, 2015
webinar Webinars
November 20, 2014
Publications & Presentations
Does Joinder of a Forum Defendant Always Prevent Removal?
Product Liability Law & Strategy, Vol. 28, Number 11
May 2009
Publications & Presentations
Rule 34's Direct Access Provision
Product Liability Law & Strategy, Volume 26, Number 7
January 2008
Publications & Presentations
Speaking Outside the Box – Juror Questioning of Witnesses at Trial
Product Liability Law & Strategy, Vol. 25, Number 8
February 2007
Publications & Presentations
Medical Staff Quality Assurance and Peer Review
Illinois Jurisprudence, Vol. 27, Chapter 3
Publications & Presentations
Federal Rule of Civil Procedure 68 – The Often Overlooked Defense Tool
Product Liability Law & Strategy
Spring 2004
Publications & Presentations
Third Party Sexual Harassment in the Dental Profession – Dentists Caught In A Pinch
American Dental Association Legal Advisor
January 2004
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