MARK S. ARMSTRONG is a Member of the Firm in the Health Care and Life Sciences practice, in the firm's Houston office.

Mr. Armstrong:

  • Represents clients with issues concerning state, federal and commercial reimbursement, including challenges to regulatory actions and disputes under government and commercial payor contracts
  • Conducts compliance investigations and advises a broad range of clients, including hospitals, pharmaceutical companies, pharmaceutical wholesalers, pharmacies and managed care organizations, pharmacy benefit managers, and physician practices on compliance matters
  • Defends clients undergoing investigation for health care fraud by the Department of Justice, the Department of Health and Human Services Office of the Inspector General, and other state and federal governmental authorities
  • Represents academic medical centers in suits brought by faculty members
  • Advises and counsels managed care organizations on a broad variety of issues, including developing and implementing an ACO strategy
  • Represents health care providers, manufacturers, and suppliers during administrative hearings before state licensing boards
  • Advises and counsels clients on peer review issues, medical staff appointments, and clinical privilege delineation for physicians and allied health professionals
  • Represents clients in antitrust litigation involving prescription drug pricing issues including discriminatory pricing practices, price fixing, and market allocation agreements
  • Advises and counsels clients regarding FDA regulations related to labeling, packaging, and promotional and marketing materials

A frequent lecturer, author, and contributor on health law issues, Mr. Armstrong is Peer Review rated "AV" by Martindale-Hubbell, the highest rating that an attorney can receive for competence and integrity.

Mr. Armstrong is a community member of the Committee for the Protection of Human Subjects, an Institutional Review Board, for the University of Texas Health Science Center at Houston. Prior to his legal career, Mr. Armstrong was a sales representative for a major pharmaceutical manufacturer, where he marketed brand-name prescription drugs to physicians and pharmacists.


  • South Texas College of Law (J.D., 1991)
  • Baylor University (B.A., 1982)

Court Admissions

  • Supreme Court of the United States
  • U.S. Court of Appeals for the Fifth Circuit
  • U.S. District Court, Eastern District of Texas
  • U.S. District Court, Northern District of Texas
  • U.S. District Court, Southern District of Texas
  • U.S. District Court, Western District of Texas

Bar Admissions

  • Texas