Daniel S. Zinsmaster

Partner

Dan provides trusted counsel and advocacy to health care clients on a variety of matters, such as corporate compliance, provider credentialing, administrative proceedings, and litigation. He also advises clients on practice formation and acquisition, as well as contract review and preparation. In recent years, Dan has helped health care companies and providers navigate through fraud and abuse investigations, antitrust reviews, and other white collar criminal matters.  He is a frequent author and lecturer on telehealth and telemedicine issues.

Prior to joining Dinsmore, Dan practiced for nearly seven years with the State Medical Board of Ohio, where he advised board members and agency personnel on issues related to licensure and professional ethics, as well as federal rules and regulations implicating the area of health care. His substantial regulatory experience enables him to bring a unique and insightful perspective to handling diverse and complex health care matters, and his thorough understanding of health care laws and policies helps him serve as a valuable resource to corporations, health care associations, hospitals, medical practices, and individual practitioners.

In addition to his experience with federal and state health care regulatory agencies, Dan successfully counsels clients in the growing areas of cannabis and medical marijuana. He has successfully advised cultivators, processors, and dispensary applicants or license holders in numerous capacities and counseled health care providers and medical centers seeking to incorporate and leverage medical marijuana as a treatment modality for their patients.

Credentials

Education

Capital University School of Law (2005)

  • CALI Award for Excellence
  • Studied at the Center of International and European Economic Law in Thessaloniki, Greece

Ohio University (B.A., 2002)

Bar admissions

  • Ohio — 2005

Court admissions

  • U.S. District Court for the Southern District of Ohio
  • U.S. District Court for the Northern District of Ohio

Affiliations and memberships

  • Ohio State Bar Association
    • Health Law Committee, Chair (2021-2022)
    • Administrative Law Committee, Vice Chair (2024-2024)
    • Administrative Agency Specialty Board, Board Member (2024-Present)
  • Columbus Bar Association
    • Health Care Law Committee
  • American Bar Association
    • Health Law Section
    • Substance Use Disorders Task Force
  • Society of Ohio Healthcare Attorneys / Ohio Hospital Association
  • American Health Lawyers Association
  • International Cannabis Bar Association
  • Leadership Columbus

Distinctions

  • Go-To Thought Leader, The National Law Review (2019)
  • Board Certified Specialist in Administrative Agency Law by the Ohio State Bar Association

Career Highlights
  • Counseled Health Care System on Medical Marijuana Guidelines

    On behalf of a hospital system and its employed physicians, we prepared various informed consent forms, internal policies, and procedural manuals for use by licensed providers who have obtained a Certificate to Recommend Medical Marijuana from the State Medical Board of Ohio and are seeking to utilize medical marijuana as a potential treatment modality. We also advised the hospital system on navigating state and federal guidelines and avoidance of potential compliance issues and violations.

  • Counseled Treatment Center through Investigation

    On behalf of a multi-office Ohio addiction treatment center, we handled the fraud and abuse investigation and subsequent negotiations with federal authorities who were reviewing the client’s receipt of free drug screening equipment from one of the largest laboratories in the country.  We successfully persuaded the United States Department of Justice to decline bringing criminal or civil charges, and the matter was eventually resolved with minor civil penalties paid to the United States Department of Health and Human Services / Office of Inspector General and avoidance of any administrative sanctions, including exclusion from participation in public health programs.

Publications
  • December 24, 2025

    Christmas Comes Early to the Cannabis Industry

  • October 27, 2025

    Stay in your Lane: Ohio Proposes New Rules on Office-Based Surgery

  • October 14, 2025

    Ohio Bans Intoxicating Hemp Products for 90 Days

  • May 28, 2025

    Mixing Medicine and Risk: Ohio’s Joint Regulatory Statement Targets Retail IV Therapy Clinics

  • March 14, 2025

    Ohio Board of Pharmacy Takes Aim at Dispensing Errors

  • January 21, 2025

    DEA Expands Telemedicine Flexibilities Through Three New Rules

  • December 23, 2024

    New Ohio Law Tightens Mandatory Reporting Following Dr. Strauss Report

  • November 20, 2024

    DEA Further Extends Telemedicine Prescribing Flexibilities Through December 2025

  • August 22, 2024

    Texas Court Revives Viability of Healthcare Non-Competes

  • July 26, 2024

    Pennsylvania Court Rules Non-Compete Ban Can Stand

News
  • March 20, 2024

    Columbus Healthcare Partner Explains What’s Next after Ohioans Approve Recreational Marijuana

Events
  • December 22, 2025

    Navigating the Challenges of Advising Health Care Practitioners and Entities regarding Provider Impairment, Confidential Treatment Programs, and Licensure and Credentialing Reviews

  • April 30, 2025

    License Portability: Enhanced Options and Evolving Flexibility for Health Care Provider Licensure

  • March 28, 2025

    Report More, Sooner, or Face Consequences: New Ohio Facility and Provider Mandatory Reporting

  • February 27, 2025

    New Mandatory Reporting: How SB 109 Requires Hospitals, ASCs and Physicians to Report More, Sooner, or Face (New/Criminal) Penalties

  • June 11, 2024

    #Like #Repost #Subscribe The Pitfalls and Benefits of Social Media

  • May 17, 2024

    Maintaining Compliance with the Board of Pharmacy

  • May 16, 2024

    Update on Provider Employment Agreements and Non-Compete Provisions

  • May 16, 2024

    Navigating Confidentiality Implications when Communicating with Patients and Third Parties

  • May 16, 2024

    Medical Practice and Social Media: Tips and Caution

  • March 27, 2024

    Physician Sexual Misconduct: Policy Revisions, Reporting Requirements, Peer Review Process, Privileges