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Heyl Royster



Deanna Mool (Of Counsel)


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

In the practice of healthcare law, Deanna has represented hospitals, nursing homes, assisted living facilities, physicians, audiologists, nurses and other healthcare professionals. She gained valuable healthcare law experience as General Counsel to the Illinois Department of Public Health (1996-2001). She also served as in-house counsel at the SIU School of Medicine (2013-2016). She has assisted more than 200 clients with HIPAA compliance. Deanna also advises clients regarding HIPAA breach compliance. She frequently drafts leases, physician employment agreements, and affiliation agreements to assist healthcare facilities and providers in order to comply with Stark and other healthcare laws. She has drafted compliance plans and is certified in Healthcare Compliance through HCCA. 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 Planning 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 relates to the task of analyzing which Illinois laws are preempted by HIPAA.

Deanna works with businesses to set up corporate structures, address employment issues, and has represented buyers and sellers in corporate transactions. She works with businesses to address financing issues, governance and licensing. Deanna has worked with many businesses to solve a variety of day-to-day operational issues, and assist in planning for the future direction of the business.

Deanna also works with families to preserve their assets through estate planning. She advises clients how to protect 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. Her practice began advising clients on Environmental Law in Indianapolis, 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. She also provided legal advice to all of the Department's more than 100 programs, including such diverse areas as: bioterrorism, asbestos removal, private wells, plumbing licensure, mobile home regulation, communicable diseases, and a variety of other healthcare programs. In 2001, Deanna returned to private practice. She opened her own firm in 2005 where she assisted a wide variety of clients in the areas of health law, HIPAA, election law, and estate planning.

Deanna 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 (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

  • “Board Member Responsibilities”
    Illinois Critical Access Hospital Network (ICAHN) - Southwestern Regional Meeting 2019
  • “HIPAA Prophylaxis: Preventing HIPAA Compliance Issues”
    Illini District Dental Society 2018
  • “In the Weeds: An Updated on Medical Cannabis in Illinois”
    Illinois Critical Access Hospital Network Webinar 2018
  • “Cybersecurity”
    ISHRM Annual Meeting 2018
  • “Physician Arrangement Bootcamp”
    National Compliance Institute of the Health Care Compliance Association 2018
  • “Hospital Board Responsibilities: A Guide for Success”
    Illinois Critical Access Hospital Network (ICAHN) 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
  • Click here to view full list”

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