Sectors
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Claire Marblestone

Partner

Claire Marblestone’s practice focuses on transactional and health care regulatory matters, with an emphasis on health care mergers and acquisitions, strategic joint ventures, and complex regulatory compliance issues. She advises hospitals, health systems, physician groups, digital health providers, and health care businesses on a range of complex regulatory and compliance issues. Claire also provides regulatory and transactional counsel to companies specializing in women’s health care.

Claire has been recognized by Chambers USA: America’s Leading Business Lawyers:

Claire is very knowledgeable on a plethora of items. Her guidance has always been top notch.”

Claire is very knowledgeable and client focused. She has a very good bead on what I need and packages it in a way that can be used effectively. She is also very responsive.”

Claire Marblestone is deeply integrated into our company and thus able to provide detailed advice while holding our company vision. She is always able to answer the questions we have. She is also really helpful in translating the impact of the legal elements into the business terms. She’s highly available, clear and concise in her communications and highly client-oriented.”

“Claire’s strengths include her ability to understand our needs and solve issues with our clients accordingly. Claire is polite, extremely diplomatic but firm during negotiations. She is also extremely responsive and understands the law better than anyone we’ve encountered.”

Transactional Counsel

Claire provides transactional counsel to health care organizations, hospitals, physician groups, and other health care providers. She has structured, drafted, and negotiated documents relating to hospital acquisitions, joint ventures, health care provider mergers, service agreements, and management agreements. She conducts health regulatory due diligence and advises on health care company acquisitions and investments.

Regulatory Compliance

Claire works with clients on state licensure regulatory compliance issues, as well as compliance with Medicare and Medicaid rules and regulations. She has extensive experience assisting digital health clients with complex health care privacy compliance issues and advising on potential fraud and abuse concerns. Claire also provides regulatory advice to health plans and risk bearing organizations on compliance with various state and federal health insurance laws and regulations, including the Knox-Keene Act.

Claire is a member of the Health Care Transactional and Health Care Regulatory Practice Groups and a member of the Health Care & Life Sciences Sector.

Representative Experience

  • Represented a California regional health care system in the acquisition of several physician practices.
  • Represented a health system in a joint venture with its orthopedic business partner.
  • Provided regulatory guidance and counsel to health care provider creating a generative AI application for patient engagement and specialty triage.
  • Represented multiple California county hospitals on transactional matters, including practice acquisitions, regional affiliations, and creation of a hospital authority.
  • Represented a multistate women’s health care practice on several joint venture affiliations with regional health systems.
  • Advised multiple providers and hospital system clients in connection with physician alignment models and strategies, including joint venture arrangements.
  • Negotiated physician and provider employment agreements on behalf of a multispecialty physician group.
  • Advised healthcare companies and investors on structuring of multi-state management models, including corporate practice of medicine compliance, management arrangements, and transaction review reporting obligations.
  • Counseled Medi-Cal managed care plan on regulatory compliance, operational, and Department of Managed Health Care enforcement issues.
  • Advised health care providers on regulatory and business needs relating to winding down service lines, physician offices, and health care businesses.
  • Structured, advised, and negotiated a transaction involving the merger of two federally qualified health centers.
  • Counseled health care providers on general corporate and regulatory compliance matters, including California licensure compliance, professional scope of practice issues, and marketing compliance.
  • Assisted hospitals, physicians, and other health care providers with establishing concierge medical practices.
  • Represented a California nonprofit hospital in joint venture arrangement for an innovative cancer center.
  • Structured physician and provider relationships with national behavioral health platform.
  • Represented the selling shareholders of a Medi-Cal managed care plan in the sale of the plan.
  • Advises on data privacy issues and breach responses, including compliance with HIPAA, 42 C.F.R Part 2, and state privacy laws such as California’s Confidentiality of Medical Information Act.

Awards and Recognition

  • Chambers USA, Healthcare (2020-2026)
  • Selected by Los Angeles Business Journal as Top 100 Lawyer (2025)
  • Selected by Los Angeles Business Journal as Women of Influence: Health Care (2025)
  • Selected by A. Business First as Women of Influence (2024)
  • Los Angeles Business Journal, Health Care Leadership Awards, Trusted Advisor of the Year (2023)
  • California Super Lawyers – Rising Stars® list (2019-2021), which recognizes the top 2.5% of California lawyers under 40

Affiliations

  • Member of Healthcare Law Section of the Los Angeles County Bar Association
  • Member of California Society for Healthcare Attorneys
  • Member of American Health Lawyers Association
  • Member of Foley’s National Women’s Network

Presentations and Publications

  • Co-author, “Physician-Hospital Affiliation Models,” American Health Law Association, Representing Physicians Handbook (5th) (October 2025)
  • Co-author, “Navigating Abortion Training for Resident Physicians in a Post-Dobbs Era,” California Health Law News (Summer 2025)
  • Speaker, “Strategies for Working with and Discharging Homeless Populations,” Hospital Association of Southern California’s 2024 Annual Meeting (May 21, 2024)
  • Speaker, “Considerations for Structuring Physician Group Acquisitions,” American Health Law Association (April 25-27, 2022)
  • Speaker, “Whose Medical Practice is it Anyway? A Discussion of California’s Prohibition on the Corporate Practice of Medicine,” California Society for Healthcare Attorneys (November 19, 2021)
  • Speaker, “Hot Button Issues in Privacy – CCPA and HIPAA,” ACC Health Law Network Webinar (March 3, 2020)
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July 21, 2026 Health Care Law Today

Off-Campus Outpatient Departments: CMS’ Proposed Rule for the New Mandatory Attestation Process

The Centers for Medicare & Medicaid (CMS) issued proposed regulations implementing Section 6225 of the Consolidated Appropriations Act, 2026 (CAA), codified at 42 U.S.C. § 1395l(t)(23), as part of the proposed Calendar Year (CY) 2027 Hospital Outpatient Prospective Payment (OPPS) rule.
June 4, 2026 Press Releases

Foley Achieves Top Rankings in Chambers USA 2026

Foley & Lardner LLP is proud to once again be recognized by Chambers & Partners as one of the leading law firms in the country in the 2025 edition of Chambers USA: America’s Leading Lawyers for Business.
A close-up of healthcare plan documents, including an application form and an employee enrollment form, placed on a wooden surface in a law office specializing in intellectual property law.
March 30, 2026 Health Care Law Today

Medicare’s New NPI and Attestation Rules for Hospital Off-Campus Departments: Preparation Starts Now

Hospitals that are paid under the Medicare Outpatient Prospective Payment System (OPPS) need to prepare for new billing and attestation requirements for off-campus outpatient departments that go into effect in January of 2028. These new requirements are included as Section 6225 of the Consolidated Appropriations Act (CAA) and continue the long-term trend of Medicare scrutiny of these locations, introducing a new subsection of the statute, Section 1833t(23) of the Social Security Act. 
March 2, 2026 Foley Viewpoints

Recent Developments for Private Company M&A

This report highlights some recent developments relevant to private company M&A.
October 22, 2025 Health Care Law Today

California AB 1415 Signed: Enhanced Health Care Transactions Scrutiny for Weary Investors

Less than a week after California Governor Gavin Newsom signed SB 351 into law to reinforce California’s prohibition on the corporate...
October 13, 2025 Health Care Law Today

California SB 351 Signed: Limits on Private Equity Management of Medical Practices

On Monday, October 6, 2025, California Governor Gavin Newsom signed SB 351, which serves to codify and reinforce California’s already...