Lorraine Ater Rosado


Senior Counsel

Office: (202) 298-8750
Fax: (210) 745-4645

Practice Concentration and Experience:

Lorraine Ater Rosado is a key member of Liles Parker’s healthcare team. She defends healthcare providers facing overpayment claims and counsels clients nationwide on compliance with healthcare statutes, regulations, and contract matters. She has represented providers in panel qualification and termination matters. She has extensive experience working on complex cases involving both Federal and State violations of the False Claims Act, including whistleblower cases. She is skilled in administrative litigation and appeals.

Lorraine has handled claims disputes involving most major healthcare payors, including Medicare, Medicaid, TRICARE, various BlueCross BlueShield entities, and UnitedHealthcare. She is experienced working on large, complex administrative appeals of extrapolated alleged overpayments assessed by Centers for Medicare and Medicaid Services (CMS) contractors, including Unified Program Integrity Contractors (UPICs).

Lorraine has represented the entire spectrum of medical providers and suppliers, including primary care and specialty physicians and physician groups in private practice and hospital employment; dentists; mental health professionals; podiatrists; home health agencies; skilled nursing facilities; hospices; ambulance service providers; physical, occupational, and speech therapists; chiropractors; and durable medical equipment suppliers.

Lorraine received her J.D. from Lewis and Clark Law School in Portland, Oregon, where she received the Global Law Scholar award. She externed in the chambers of a Senior Advocate in New Delhi, India where she gained experience conducting legal research and writing legal memoranda on matters before the Supreme Court of India. She also studied legal matters in China and Austria while in law school. Lorraine attended Union College in Schenectady, New York where she received a B.A. in Political Science, with a minor in German. In her final year, she was the recipient of the Alvin F. Nitchman Prize, a prize awarded to the most promising senior who plans to attend law school.


  • Lewis and Clark Law School, Oregon (J.D. 2011)
  • Union College, New York (B.A. 2009, magna cum laude, Phi Beta Kappa)

Professional Affiliations:

  • American Bar Association
  • American Health Lawyers Association
  • New York State Bar Association (Member of the Health Law Section's Reimbursement, Enforcement & Compliance committee)
  • Certified Professional Coder (CPC) (AAPC - magna cum laude)
  • Certified Medical Compliance Officer
  • Certified Medical Reimbursement Specialist


  • Admitted to Practice in New York
  • Admitted to Practice in District of Columbia

Articles and Presentations: