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M. Daria Niewenhous




Daria’s multifaceted health care practice serves the full range of provider entities. She draws on her own in-house counsel experience to help clients attain compliant, efficient operations while navigating industry and regulatory roadblocks. Her concrete, practical guidance helps clients manage risks and compete in the face of remarkable cost pressures.

Daria's practice ranges from transactional matters to general counsel services. She has extensive experience with the merger and acquisition of hospitals, long-term care facilities, clinics, assisted living facilities, home health and hospice programs, group practices, substance use disorder facilities, and other provider entities. She guides clients through the regulatory aspects of capital projects and other strategic initiatives. Active in health care reform matters, Daria works with clients on clinical integration and affiliation, ACOs, and similar arrangements. In addition, Daria provides experienced counsel in areas of contracting, patient care/risk management matters, privacy and security of patient information (HIPAA), and addressing adverse events, including internal investigations and crisis management.

After beginning her legal career at Mintz, she served as Vice President of Legal Services at Lahey Clinic, Burlington, Massachusetts. While at Lahey, she provided comprehensive general counsel services, advising physician leaders and management on all aspects of the Lahey delivery system, which includes a tertiary care teaching hospital, outpatient primary care and specialty clinics, and a community group practice network.

Daria serves as the Vice-Chair of Publishing for the Business Law and Governance Section of the American Health Lawyers Association. She is frequently invited to speak on a variety of topics, including regulatory issues specific to the provider audience, corporate governance, transactional matters, internal investigations, and violence in the workplace and in health care settings.

A Mintz Pro Bono Award recipient, Daria served for eight years as director of Mintz's Domestic Violence Project, the firm's signature pro bono initiative and is active in the Pro Bono Program. Daria brings years of domestic violence advocacy to educate providers on domestic violence’s impact on the workplace and patient care. She has been a guest lecturer on this topic at Boston College School of Nursing, the Harvard School of Public Health, and Stonehill College, and at grand rounds at the Dana-Farber Cancer Institute.


  • New England Law (JD)
  • Villanova University (MA)
  • Salem State College (BA)

Recognition & Awards

  • Best Lawyers in America: Health Care Law (2013 – 2021)
  • Chambers USA: Massachusetts – Healthcare (2013 – 2020)
  • Included on the Massachusetts Super Lawyers: Health Care list (2013 – 2020)
  • Nightingale’s Healthcare News: Outstanding Hospital Lawyer (2008)
  • Mintz Pro Bono Award (1997)


  • Member, American Health Law Association
  • Vice-Chair of Publishing, AHLA Business Law and Governance Practice Group
  • Member, Massachusetts Bar Association
  • Member, Boston Bar Association, Health Law Section
  • Member, American Bar Association
  • Director, StonehamBank – A Co-operative Bank, Stoneham, Massachusetts
  • Trustee, Greater Boston Stage Company

Recent Insights

News & Press


The Health Policy Commission’s Annual Cost Trends Hearings

November 1, 2016 | Alert | By Steven Baddour, Daniel Connelly, Julie Cox, Daria Niewenhous, Stephen Weiner, Maxwell Fathy, Elena Horvit, Parnia Zahedi

The Massachusetts Health Policy Commission conducted its fourth annual Cost Trends Hearing on October 17 and 18, 2016, under the requirements of Massachusetts’s 2012 health care reform legislation (“Chapter 224”).
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Massachusetts Health Policy Commission's Annual Cost Trends Hearings

November 1, 2016 | Blog | By Daria Niewenhous

Continuing our current coverage of health policy issues and trends, Mintz Levin's Health Law Practice and ML Strategies have issued a joint Alert regarding the Massachusetts Health Policy Commission’s Annual Cost Trends Hearings.
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Massachusetts Licensure of Clinics Proposed Regulations – Key Take-Aways

October 19, 2016 | Blog | By Ellen Janos, Daria Niewenhous

In previous blog posts, we addressed the Massachusetts Department of Public Health’s (DPH) proposed regulations that affect hospitals, dialysis clinics and medical marijuana programs. In this final post on DPH’s recent regulatory review and overhaul, we address the proposed amendments to the clinic licensure regulations.
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The Massachusetts Department of Public Health (DPH) has released for public comment proposed amendments to DPH’s Medical Marijuana Regulations (105 CMR 725) (the “regulations”).
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The Massachusetts Department of Public Health (DPH) has released for public comment proposed amendments to DPH’s Hospital Licensure Regulations (105 CMR 130.00) (the “regulations”). The proposed amendments are designed to enable the regulations to meet a number of goals, among them ensuring a high quality of care, industry standardization and strong consumer protection for hospital patients.
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The Massachusetts Department of Public Health (DPH) has released proposed amended regulations for the licensure of hospitals, clinics, and out-of-hospital dialysis units, proposed the rescission of separate birth center regulations, and proposed amended regulations for medical marijuana.
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Massachusetts Determination of Need Regulation Overhaul

August 24, 2016 | Blog | By Daria Niewenhous

The Massachusetts Department of Public Health (DPH) Determination of Need (DoN) Program has unveiled proposed regulations that constitute an ambitious and, perhaps, long overdue overhaul of the DoN Program regulations.
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New Rules for ACOs in the MSSP

June 15, 2016 | Blog | By Bridgette Keller, Daria Niewenhous

CMS issued a final rule, published in the Federal Register on Friday, June 10, 2016, updating how the performance of ACOs participating in the Medicare Shared Savings Program (MSSP) is measured and compensated. 
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Massachusetts Establishes Road-Map for New ACO Program

April 22, 2016 | Blog | By Bridgette Keller, Daria Niewenhous

Massachusetts Secretary of Health and Human Services, Marylou Sudders, held a public meeting earlier this week to receive feedback on the proposal of the Executive Office of Health and Human Services (EOHHS) to overhaul the Massachusetts Medicaid program, known as MassHealth. 
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The Massachusetts Health Policy Commission (HPC) has issued its 2015 Cost Trends Report, based on the HPC’s annual health care cost growth hearings.
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News & Press

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Mintz Member M. Daria Niewenhous co-authored an American Health Lawyers Association (AHLA) Business Law and Governance Practice Group Briefing that featured a Q&A discussion with two strategic communications and media experts, including Senior Vice President, Strategic Communications of ML Strategies Nancy J. Sterling, APR, Fellow PRSA, offering insights on best practices for proactive and reactive media communications for healthcare organizations.
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Mintz partner and Massachusetts lawyer Julie Korostoff is one of 49 attorneys recognized as “Leaders in Their Fields” by the 2018 Chambers USA: America's Leading Lawyers for Business guide. Chambers named Korostoff a “Recognized Practitioner” in Technology.
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Best Lawyers named 85 Mintz attorneys to its 2018 list of The Best Lawyers in America. In addition, Mintz attorneys Matthew J. Gardella and Samuel M. Tony Starr were named “Lawyer of the Year” in their respective practice areas.
Fifty-three Mintz attorneys have been named Massachusetts Super Lawyers for 2016 and thirty-one have been named Massachusetts Rising Stars. The findings will be published in the November 2016 issue of Boston Magazine and in a stand-alone magazine, New England Super Lawyers. 
Best Lawyers named 73 Mintz attorneys to its 2017 list of The Best Lawyers in America. Mintz attorneys selected for inclusion in this year’s list span 44 practice areas. 
Firm’s National Healthcare Practice, NY Corporate/M&A and Litigation: General Commercial Among Newest Rankings
The 2015 Chambers USA: America's Leading Lawyers for Business guide names 52 Mintz, Cohn, Ferris, Glovsky and Popeo, P.C.  attorneys as “Leaders in Their Fields.”



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