Deanna Mool

Practice Groups:

Business Organizations & Transactions

Cybersecurity and Data Privacy

Elder Law

Estate, Wealth and Succession Planning



Intellectual Property

Long Term Care/Nursing Homes

Pharmaceutical and Medical Devices

Trusts and Probate

Office Locations:

Springfield, IL



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  • Juris Doctor, University of Illinois College of Law, 1990
  • Bachelor of Science-Economics, University of Illinois, 1987

Year Joined Firm



Heyl Royster


Deanna Mool (Of Counsel)

Deanna’s practice is focused on transactional and regulatory issues for business and healthcare providers. She also does Estate Planning for individual clients.

Deanna works with businesses to advise owners, investors, and corporations throughout the life of the business, including: initial formation, financing, employment issues, and corporate transactions. She serves as buyer or seller’s counsel in a variety of transactional matters, such as mergers, asset purchases, real estate sales, and the accompanying issues related to financing each type of transaction. Deanna has worked with many businesses to solve a variety of day-to-day operational issues, liquidity challenges, and to assist in planning for the future direction of the business. She also represents not-for-profit organizations with legal issues relating to entity formation and achieving tax exempt status.

In the practice of healthcare law, Deanna has represented hospitals, nursing homes, assisted living facilities, physicians, nurses and other healthcare professionals. She served as General Counsel to the Illinois Department of Public Health (1996-2001) and in-house counsel at the SIU School of Medicine (2013-2016). Deanna frequently drafts leases, physician employment agreements, and affiliation agreements to assist healthcare facilities and providers in order to comply with Stark, anti-kickback, and other healthcare laws. She has drafted compliance plans and is certified in Healthcare Compliance through HCCA. She has assisted more than 200 clients with HIPAA compliance. Deanna also advises clients regarding HIPAA breach compliance. Deanna advised a local Institutional Review Board with respect to FDA compliance of research matters. Deanna has advised a variety of healthcare clients during audits and during enforcement proceedings before both federal agencies and the Illinois Department of Healthcare and Family Services, including enforcement proceedings related to Medicaid/Medicare reimbursement. Deanna has earned certificates-of-need for healthcare facilities before the Illinois Health Facilities and Services Review Board; represented facilities in obtaining operating licenses from both the Illinois Department of Public Health and Illinois Department on Aging; and represented clients in professional licensure matters before the Illinois Department of Financial and Professional Regulation.

Deanna has assisted clients in creating policies and procedures to minimize risk in the area of cybersecurity and data privacy. She has drafted and reviewed technology contracts to install new electronic health record systems and worked with clients to prevent ransomware attacks through employee training. Deanna has assisted many healthcare providers in responding to potential breach issues related to missing laptops or lost devices, employee and contractor theft, hacking, and cloud-vendor issues. In the area of data privacy, Deanna drafted the official HIPAA Preemption Analysis for the State of Illinois, which analyzes which Illinois laws are preempted by HIPAA.

Deanna also works with families to preserve their assets through estate planning. She advises clients on protecting family assets even if a loved-one requires long term care. She also works on business continuation planning, trust creation, and routine estate planning issues.

Deanna joined Heyl Royster in 2016 after an extensive career in both the private and public sectors. She began her practice in Indianapolis advising clients on Environmental Law, after which she returned to Central Illinois as General Counsel to a House legislative caucus. While acting as General Counsel, Deanna was in charge of the legal review of all legislation. Following her legislative branch work, Deanna served as General Counsel of the Illinois Department of Public Health where she was in charge of all department legal activities including the state regulation of hospitals, nursing homes, ambulatory surgical centers, and other healthcare facilities. Beginning in 2005, Deanna operated her own firm for 13 years where she assisted a wide variety of clients in the areas of health law, business law, election law, and estate planning.

Deanna has also represented Fortune 500 companies in drafting legislation and governmental relation activities before the Illinois legislature. She has represented PACs and state and federal candidates in election recounts, petition challenges, and campaign finance issues.

Deanna Mool is a graduate of the University of Illinois College of Law. She also earned a Bachelor's degree in Economics from the University of Illinois in Champaign.

Significant Cases

  • Graham v. State Officers Electoral Bd. 269 Ill. App. 3d 609 (4th Dist. 1995) Election law decision wherein notice to fill vacancy in nomination must be given to members of the committee.


"Hospital Districts," chapter in Special Districts, Illinois Institute for Continuing Legal Education (2019)

“Telehealth and Telemedicine,” section in The Law of Medical Practice in Illinois, 3d, Vol. 21, Illinois Practice Series (2018, 2019)

“How to Self Disclose and Re-Tool Compliance at the Same Time,” Compliance Today, a publication of the Health Care Compliance Association (2017) - Download Article

Public Speaking

“HIPAA FY2021 Update”
IAPHA HIPAA Consortium 2020

“Families First Coronavirus Response Act”
Illinois Critical Access Hospital Network (ICAHN) 2020

“Sexual Harassment Training”
Illinois Critical Access Hospital Network (ICAHN) 2020

“Implementing the APRN Role within your Medical Staff”
Illinois Critical Access Hospital Network (ICAHN) 2020

ISHRM Annual Meeting 2018

“Physician Arrangement Bootcamp”
National Compliance Institute of the Health Care Compliance Association 2018

“HIPAAThermia: How to Respond to a Potential Breach Without Being Left In the Cold”
Healthcare Compliance Associate Webinar 2018

“PSO or MSA: Improving Healthcare Without Increasing Liability”
ISHRM and CHRMS 2018

“Payment for Healthcare and Compliance”
Illinois Critical Access Hospital Network (ICAHN), Annual Conference 2017

“HIPAA Compliance at Your Covered Entity”
American Health Lawyers Association “Fundamentals of Health Law” Conference 2016 & 2017

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Professional Recognition

  • Selected as a Leading Lawyer in Illinois. Only five percent of lawyers in the state are named as Leading Lawyers.
  • Forty Under 40, Springfield Business Journal

Court Admissions

  • State Courts of Illinois
  • State Courts of Indiana
  • United States District Court, Central District of Illinois