Skip to content Matthew G. Kleiner


San Diego
101 W. Broadway
Suite 2000
San Diego, CA 92101

Two N. Central Avenue
Suite 2200
Phoenix, AZ 85004

One South Church Avenue
Suite 1200
Tucson, AZ 85701


J.D., cum laude, Santa Clara University School of Law, 2000

  • Technical Editor, Santa Clara Law Review

International Human Rights, Oxford University, 1998

B.A., magna cum laude, Political Science, University of Arizona


Best Lawyers in America® distinction in Insurance Law (2020-2024)

Certified by The State of California Board of Legal Specialization as an Appellate Specialist

Super Lawyers® distinction in the fields of Appellate, Employee Benefits/ERISA, and Insurance Coverage (2013-2015)


Matthew G. Kleiner is a responsive, thoughtful, and skilled attorney whose practice focuses on appellate work and defending health care and insurance litigation.  He is one of a handful of attorneys in California certified as an appellate specialist.  He is also licensed and practices in both California and Arizona.  Matt prides himself on developing creative strategies to short-cut potentially expensive litigation via early settlement, motion practice, or other resolution.      


Matt is certified as an Appellate Specialist by the California Board of Legal Specialization.  He has nearly 20 years of experience handling appellate matters before the Ninth Circuit Court of Appeals, California Courts of Appeal, and Arizona Courts of Appeals.  Matt has handled hundreds of appeals, argued in Federal, California, and Arizona appellate courts, and has favorable decisions published in all three jurisdictions.

Health Care

Matt has extensive experience defending health and disability arbitration and litigation brought under both the Employment Retirement Income Security Act of 1974 (“ERISA”) and state law.  These cases involve a variety of issues including claims brought against health insurers by both their members and health care providers.  The member litigation relates to claims for benefits, bad faith, and breach of fiduciary duty.  The provider litigation involves claims brought by contracted and non-contracted health care providers for breach of contract, extra-contractual claims, and failure to pay.


Matt also has provided insurance coverage advice and defending bad faith litigation since graduating Santa Clara law school in 2000.  His practice covers important and complex issues confronting insurance companies in areas such as:
  • Environmental liabilities
  • First party property
  • Asbestos and other toxic tort coverage
  • Primary and excess exhaustion and priority issues
  • Directors and officers claims
  • General liability claims
  • Professional liability claims
  • Bad faith allegations
  • Life  


  • Arizona
  • California
  • U.S. District Courts, Arizona
  • U.S. District Courts, California
  • U.S. Court of Appeals, Ninth Circuit
  • U.S. Court of Appeals, Federal Circuit
  • U.S. Supreme Court
Publications & Presentations