Michael M. Maddigan

Michael M. Maddigan

Office Managing Partner
Los Angeles

Email [email protected]​hoganlovells.com

Phone +1 310 785 4727

Fax +1 310 785 4601

Practice groupLitigation, Arbitration, and Employment

In court, Mike Maddigan is tough – but also practical and solution-oriented. Over the years, Mike has led teams that successfully defended clients against claims totaling billions of dollars. He has negotiated creative and innovative settlements to avoid and resolve litigation. By using the right tool at the right time, Mike helps clients solve problems and address risks in ways that accomplish their business objectives.

An experienced and accomplished litigator, Mike leads the Los Angeles office Litigation Practice Group. He has been at the forefront of significant commercial and class action litigation involving breach of contract, the False Claims Act (FCA), privacy and data breaches, insurance, and antitrust for established and emerging companies across the health care, insurance, and technology industries.

Mike is a thought leader in the health care and privacy areas. He is the co-author of Health Care Reform: Law and Practice, a publication that provides guidance on the Affordable Care Act's impact on health plans, employers, and individuals. He is also co-author and editor of Medical Records Privacy Under HIPAA. Mike speaks and writes regularly on professional issues including the FCA, emerging issues in privacy law, and new developments in insurance and antitrust law.

Mike has been recognized by a variety of industry publications, including The Legal 500 2015 (advice to insurers) and 2014 (health care; health service providers).

Mike is also active in the Los Angeles legal community. He served as president of the Association of Business Trial Lawyers, and is a member of the board of directors of the Legal Aid Foundation of Los Angeles, and the board of governors of the Inner City Law Center.

Awards and recognitions


Healthcare (California)
Chambers USA


Healthcare: Health Service Providers
Legal 500 US


Health Care, Class Action/Mass Torts, Insurance Coverage, 2004, 2009-2014
Super Lawyers


Healthcare: Advice to Health Insurers
Legal 500 US


Healthcare: Health Insurers
Legal 500 US

Education and admissions


J.D., University of California, Berkeley School of Law, 1992

B.S.F.S., Georgetown University, School of Foreign Service, cum laude, 1989


Member, American Health Lawyers Association 

Board of Directors, Inner City Law Center 

Board of Directors, Los Angeles Irish American Bar Association

Board of Directors, Los Angeles Legal Aid Foundation 

Member, American Bar Association, Health Law Section 

Member, Association of Business Trial Lawyers (President 2010-2011, Vice President 2009-2010, Treasurer 2008-2009, Secretary 2007-2008) 

Member, Los Angeles County Bar Association, Healthcare Law Section

Bar admissions and qualifications


Court admissions

U.S. Court of Appeals, Ninth Circuit

U.S. Court of Appeals, Third Circuit

U.S. District Court, Central District of California

U.S. District Court, District of Colorado

U.S. District Court, Southern District of California

U.S. District Court, Western District of New York

Related knowledge


Representative experience

Represented large health insurer in class action litigation asserting privacy and negligence related claims arising out of a cyber-attack.

Represented healthcare company in breach of contract action seeking damages in excess of US$100m.

Represented large public university in internal investigation and regulatory issues related to cyber-attack.

Represented leading insurer in bad faith action based on allegedly improper handling of construction defect claims.

Represented large managed care company in civil false claims suit. Obtained dismissal of relator's claims without leave to amend.

Represented health insurer in qui tam action filed under False Claims Act. Obtained dismissal of claims.

Represented large health insurer in multimillion-dollar payment dispute with hospital system.

Advised companies in several industries on regulatory, litigation, and compliance issues related to data privacy incidents and policies.

Represented leading insurance company in coverage and bad-faith litigation involving alleged asbestos and environmental liabilities.*

Representing one of the nation's largest health insurers in a purported nationwide RICO class action challenging the company's medical policy.*

Representing Advanced Micro Devices (AMD) in antitrust claims against Intel, resulting in US$1.25B settlement for AMD.*

Representing Advanced Micro Devices (AMD) in antitrust claims against Intel, resulting in US$1.25bn settlement for AMD.*

*Matter handled prior to joining Hogan Lovells.

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