Elizabeth Bock represents health care organizations in a variety of complex regulatory, enforcement, and litigation matters involving Medicare Advantage, Medicaid, and the Affordable Care Act.
Elizabeth is experienced with providing regulatory counseling and strategic guidance; conducting internal investigations and developing related disclosures; representing clients in responding to government investigations, civil investigative demands, subpoenas, audits, and congressional inquiries; and defending False Claims Act litigation.
Elizabeth has a deep knowledge of risk adjustment and extensive experience on a wide variety of risk adjustment-related matters.
In addition, Elizabeth represents clients in matters involving other aspects of the Medicare Advantage, Medicaid, and Affordable Care Act programs, including Medical Loss Ratio, utilization management, payment integrity, and quality metrics.
In 2024, Law360 recognized Elizabeth as a Rising Star—one of three top attorneys under 40 nationwide in healthcare. She was recommended by The Legal 500 US the same year for healthcare: health insurers as a key name within O’Melveny’s Health Care practice for Medicare Advantage and Affordable Care Act risk adjustment matters.
- Reviewing national managed care organizations’ compliance with Medicare Advantage regulations and related complex business challenges and opportunities.
- Conducting internal investigations for managed care organizations in connection with alleged regulatory and potential False Claims Act violations.
- Representing managed care organizations in connection with dozens of Civil and Criminal investigations by the Department of Justice and United States Attorneys’ Office.
- Defending national managed care organizations in investigations by the Department of Justice and the Office of the Inspector General of the US Department of Health and Human Services into whether the organizations complied with Medicare Advantage regulations related to risk adjustment data submissions.
- Defending national managed care organizations in False Claims Act litigation relating to compliance with Medicare Advantage regulations, including allegations related to inflated premiums resulting from inaccurate risk adjustment submissions and to the risk adjustment practices of providers and retrospective chart review, in-home assessment and other vendors.
- Defending national managed care organizations in connection with more than a dozen False Claims Act matters.
- Reviewing national managed care organizations' compliance with Affordable Care Act Exchange regulations and related complex business challenges and opportunities.
- Representing national managed care organizations in investigations by the Department of Justice related to Affordable Care Act Exchange risk adjustment and regulations for diagnosis code submissions.
- Representing managed care organizations in investigations by the Department of Justice related to compliance with Medicaid managed care requirements, including those related to risk adjustment and payment integrity.
- Counseling managed care organizations in connection with Risk Adjustment Data Validation (RADV) audits by the Centers for Medicare & Medicaid Services
- Counseling managed care organizations in connection with risk adjustment-related audits by the Office of the Inspector General of the US Department of Health and Human Services.
- Representing a national managed care organization in an Administrative Procedure Act challenge to a regulation issued by the Centers for Medicare and Medicaid Services governing Risk Adjustment Data Validation audits of Medicare Advantage plans.
- Representing a national managed care organization in responding to US congressional inquiries into prior authorization, the use of artificial intelligence and algorithms in the provision of health care services, and risk adjustment.
Admissions
Bar Admissions
- California
Court Admissions
- US District Court, Central District of California
- US District Court, Western District of New York
- US Court of Appeals, Ninth Circuit
- US Court of Appeals, Eleventh Circuit
Education
- University of Michigan, J.D.: cum laude; Dean’s Scholar; executive board editor, Michigan Law Review; Raymond K. and John R. Dykema Scholarship Award; ABA-Bloomberg BNA Award for Excellence in the Study of Health Law; Certificate of Merit for Health Law & Policy
- Vassar College, B.A., Political Science and Art History: with honors
Honors & Awards
- Named a “Rising Star” in Healthcare by Law360 (2024)
- Recommended by The Legal 500 US for Healthcare: Health Insurers (2024)
Professional Activities
Publications
- “False Claims Act Enforcement Risks for Companies Using AI,” O’Melveny Client Alert, co-authored with Amanda Santella, Anton Metlitsky, Reema Shah, Elizabeth Arias, and Gillian Mak (2026)
- “California Grants New Authority to Investigate Health Care Investments,” O’Melveny Client Alert, co-authored with David Deaton, Stephen Sullivan, Eric Zabinski, Noah Kornblith, Zach Greenberg, David Smith, and Daviel Suvor (2025)
- Featured in “What Health Attys Are Bracing For As Virus Rages Nationwide,” Law360 (2020)
- “Federal Agencies Issue New COVID-19 Medicare Advantage Notices and Policy Updates,” O’Melveny Client Alert, co-authored with David Deaton and Stephen Sullivan (2020)
- “DOJ Seeks Unprecedented Dismissal of 11 False Claims Act Qui Tam Cases on Policy Grounds,” O’Melveny Client Alert, co-authored with David Deaton, David Leviss, Caitlin Bair, Ross Galin, Amanda Santella, and Aaron Rogoff (2018)
- “Medical Record Privacy Under HIPAA,” co-authored with Michael Maddigan (2013)
Speaker
- “Medical Loss Ratio: Key Data Reporting Considerations and Risk Areas for MCOs,” American Conference Institute’s Annual Advanced Forum on Managed Care Disputes and Litigation (March 2023)
- Moderator, Women Lawyers Association of Los Angeles Annual Litigators Forum (March 2023)
- “Medical Loss Ratio Compliance and Enforcement Considerations for MCOs,” American Conference Institute’s Annual Advanced Forum on Managed Care Disputes and Litigation (March 2022)
- “Risk Adjustment Litigation and FCA Claims,” American Bar Association’s National Managed Care Institute (November 2020)
- “Whistleblower Actions 2016 Webinar,” Bridgeport Continuing Education (February 2016)
Externships
- Honorable Magistrate Judge Carla M. Woehrle, US District Court for the Central District of California
Member
- American Health Law Association, Member
- Women Lawyers Association of Los Angeles, Board of Governors (2018-2023)
- Women Lawyers Association of Los Angeles, Foundation Board (2018-2023)
- LevittQuinn Family Law Center, Board of Directors (2022-2024)
Related Practices
Related Industries