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About me

WILLIAM J. CADIGAN is principal in the Law Office of William J. Cadigan, P.C. located in Chicago, Illinois. Before starting his own firm, Mr. Cadigan was a member of the Health Industry Group of the law firm of Akin, Gump, Strauss, Hauer & Feld L.L.P.


In his practice, Mr. Cadigan represents hospitals, health systems, academic medical centers, physician practices, and health care trade associations and other tax exempt organizations in corporate, transactional and regulatory matters. In addition, Mr. Cadigan also provides counsel to small, middle-market, early stage and start-up companies in a variety of industries on matters ranging from formation and general corporate matters to financings and civil litigation. Mr. Cadigan also advises elected officials, candidates, and political action committees on federal and state election law compliance issues.


Mr. Cadigan formerly served as Chairman of the Board of Directors of the Chicago Technology Park, an incubator and multi-tenant facility for emerging companies in the field of biotechnology, genomics and pharmaceutical production. From 1999 to 2005, Mr. Cadigan served as a Commissioner of the Illinois Medical District. Located on Chicago’s Near West Side, the Illinois Medical District includes 560 acres of hospitals, medical research facilities, universities, and over 40 healthcare related facilities.


Before entering law school, Mr. Cadigan worked on Capitol Hill as an aide for Congressman John E. Porter (10th-IL), handling appropriations, health care, education and other domestic policy issues. Prior to entering private practice, Mr. Cadigan served as in-house counsel for Metra, the commuter rail agency for northeastern Illinois. He is admitted to practice before the Illinois Supreme Court, the U.S. District Court for the Northern District of Illinois and the U.S. Court of Appeals for the Seventh Circuit.


Mr. Cadigan is a member of the American Health Lawyers Association, the Illinois Association of Healthcare Attorneys, the American Society of Association Executives, the Chicago Bar Association, and the Lawyers Club of Chicago. He is a guest lecturer at the Loyola University Chicago School of Law Institute for Health Law and also a contributing author/editor to The Law of Medical Practice in Illinois, 3rd Edition (West Group), and Representing Physicians Handbook, 2nd Edition (American Health Lawyers Association). Mr. Cadigan provides pro bono services to the Legal Clinic of the Chicago Lighthouse for the Blind and is a past recipient of the Tomorrow's Leaders of the Profession award by the Illinois State Bar Association.


He received a Bachelor of Arts degree from Eastern Illinois University and a Juris Doctorate from the John Marshall Law School.


Bill has completed 8 marathons and is an avid bicyclist in his spare time.


Photos and videos

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Practice areas


  1. Health Care: 50%
    23 years
  2. Business: 50%
    23 years



Fixed (sometimes)

Payment types:


Attorney endorsements

2 total 

Are you an attorney? Endorse this lawyer

  • Gerald J. Turner

    Bill Cadigan does superior work for health care providers and other corporate clients!


    Gerald Turner Estate planning Attorney
    Relationship: Fellow lawyer in community

  • Jonathan Meyers

    William is well respected in the area of health care law and is a true professional.


    Jonathan Meyers Employment and labor Attorney
    Relationship: Fellow lawyer in community

Contact info

Law Office of William J. Cadigan, P.C.

33 N. Dearborn, Suite 2350
Chicago, IL, 60602


ILActive And Authorized To Practice Law199305/11/2016
We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
Young Leaders of the ProfessionIllinois State Bar Association1999
Work experience
TitleCompany nameDuration
N/AAkin Gump Strauss Hauer & Feld LLP2000 - 2004
Association namePosition nameDuration
Illinois Association of Healthcare AttorneysMember, Bylaws Committee Member2004 - Present
American Society of Association ExecutivesMember2004 - Present
American Health Lawyers AssociationMember1998 - Present
Chicago Bar AssociationMember1994 - Present
Legal cases
Case nameOutcome
At Home Health v. ShalalaSuccessful Administrative Appeal
See all legal cases 
Publication nameTitleDate
Illinois CPA SocietyFiduciary Responsibilities of Nonprofit Board Members2016
Chicago Daily Law BulletinLawyers loomed large on Rauner’s transition team2015
Law Office of William J. CadiganA New Prescription for Physician Restrictive Covenants in Illinois2014
Representing Physicians Handbook (2nd Ed.)Contributing Editor, Ch. 4, Employment Agreements and Other Working Relationships2009
Illinois Institute for Continuing Legal EducationFederal Campaign Finance and Disclosure, Practice Handbook on Election Law2007
The Law of Medical Practice in Illinois (3rd Ed.)Contributing Author, Chapter 5, Organizational and Related Aspects of Medical Practice2007
Chicago TribuneIllinois Needs the Will and a Plan to Reform State Boards and Commissions2007
Law Office of William J. Cadigan, P.C.An Outline of Critical Terms in Physician Employment Agreements2006
Reimbursement Advisor, Aspen PublishersOverpayments Under Scrutiny2003
Reimbursement Advisor, Aspen PublishersPatient Account Balances Subject to Unclaimed Property Laws2001
Commercial Lease Law InsiderHow To Cut Risks When Renting to E-Commerce Tenants2000
Reimbursement Advisor, Aspen PublishersBankruptcy-What Are Medicare's Rights1999
Health Fraud MonitorHome Health Care Compliance1998
School nameMajorDegreeGraduated
John Marshall Law School, ChicagoN/AN/A1993
Eastern Illinois UniversityN/AN/A1986
Speaking engagements
Conference nameTitleDate
Illinois CPA SocietyFiduciary Responsibilities of Nonprofit Board Members2016
Illinois State Medical Society WebinarA New Prescription for Physician Restrictive Covenants in Illinois2014
Wolf & Company LLP's Not-for-Profit Services Group WebinarWhen A Financial Crisis Hits, Your Board Needs to Take Action2012
Illinois Association of Healthcare Attorneys 2009 SymposiumPhysician-Hospital Employment Relationships2009