Diane Ung is a partner and health care business lawyer with Foley & Lardner LLP. Ms. Ung focuses her practice on federal and state health care legislation and payment issues arising under government programs such as Medicare and Medicaid. Her practice includes regulatory, legislative, health care and business matters for public agency clients. Ms. Ung has specific experience in structuring Medicaid financing for safety net providers in the context of disproportionate share hospital payment programs and under federal Medicaid demonstrations authorized under Section 1115 of the Social Security Act. Ms. Ung is a member of the firm's Health Care Industry Team.

Ms. Ung has represented county health departments, county managed care organizations, public hospital systems, and various large publicly operated teaching hospitals. She has helped clients evaluate and develop demonstration projects that implement innovative programs for Medicaid beneficiaries. Ms. Ung has drafted legislation regarding the Medicaid program, including statutes involving disproportionate share hospital payment adjustment systems, and has advised clients regarding Medicaid program audits conducted by the DHHS Office of the Inspector General. She has counseled clients in connection with the restructuring of public health agencies and the evaluation of public/private partnerships, including the transfer of a public hospital to a nonprofit entity. Ms. Ung also has advised clients on matters involving federally qualified health centers, and the 340B drug pricing program.

Prior to beginning her legal career, Ms. Ung spent five years in facility health planning and health services research for a major health maintenance organization.


Ms. Ung has been recognized by Southern California Super Lawyers® from 2014 – 2016. Since 2013, she has been recognized by her peers for her work in health care law in The Best Lawyers in America©.


Ms. Ung is a graduate of Loyola Law School, Los Angeles (J.D., 1993), where she was Order of the Coif; the University of California, Los Angeles, School of Public Health (M.S.P.H., 1987), where she specialized in health planning and policy analysis; and Pomona College (B.A., 1985).

Admissions and Professional Memberships

Ms. Ung is a member of the American Health Lawyers Association, the California Society for Healthcare Attorneys, and the Los Angeles County Bar Association for which she previously served as chair of the Healthcare Law Section. She serves on the board of directors of the Women in Health Administration of Southern California, serving as its president in 2007 and 2008.

Ms. Ung was admitted to the California Bar in 1993, and the District of Columbia Bar in 1996.

Representative Matters

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Advise a public hospital re affiliation strategies with potential hospital and clinic partners and related regulatory issues , in the context of the state's innovative Medicaid Section 1115 demonstration. Our advice includes payments analysis, legislation involving the creation and possible implementation of a stand-alone hospital authority, physician-hospital organization strategies, delivery organization and financing, and antitrust.
Advise on creation of independent hospital authority to which the county hospital would be transferred, and strategies for potential vertical integration of additional programs, clinics and other facilities, care organizations, physician practice plans, and delivery systems that may be affiliated or consolidated with the medical center, in the context of the state's innovative Medicaid Section 1115 demonstration.
Represented the County of Contra Costa in providing financial and operational assistance to the debtor West Contra Costa Healthcare District and its hospital, Doctors Medical Center. The County entered into a tax allocation agreement with the debtor in Chapter 9, pursuant to which the county loaned the debtor $10 million plus interest to facilitate matching funds for enhanced Medicaid payments to the debtor, and the debtor reallocated property tax revenues to the county until the loan was repaid.