HOYES & MUELLENBERG LLP

Erin L. Muellenberg is a seasoned legal professional who practices exclusively in the area of medical staff law. With a deep understanding of hospital governance, credentialing, peer review, and regulatory compliance, Erin provides practical, client-centered advice that aligns with each organization’s operational and strategic goals.

Erin L. Muellenberg

Founding Partner

emuellenberg@medicalstaffattorneys.com
D: 310-492-4472
M: 949-836-3378
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Erin represents medical staffs and governing bodies in fair hearings, disputes between providers and organizations, and litigation related to governance. She also assists clients in the development and refinement of governance documents that strengthen immunities and legal protections, and organizes process flows that support consistent, defensible decision-making.

Clients value Erin’s responsiveness, clarity, and collaborative approach. Whether advising on bylaws, policies, investigations, or medical staff structure, she brings strategic insight and a commitment to service that fosters long-term partnerships built on trust and results.

Before entering private practice, Erin served as Director of Medical Staff Services at a large community-based hospital, gaining firsthand experience with the complexities of medical staff operations. This unique perspective informs her legal counsel, allowing her to deliver solutions that are not only technically sound but grounded in real-world application. Erin continues to hold dual certification as a Certified Professional in Medical Staff Services (CPMSM) and a Certified Provider Credentialing Specialist (CPCS), underscoring her deep expertise in the field. In recognition of her leadership and contributions to the profession, Erin was designated as a fellow of the National Association of Medical Staff Services (FMSP).

Erin is a frequent speaker and author on medical staff issues, presenting to state and national associations across the country. She regularly provides training to medical staffs, governing bodies, and medical staff professionals, helping organizations build stronger, more compliant, and more effective governance structures.

In addition to her legal practice, Erin provides customized leadership training for governing boards, medical staffs, medical staff professionals, and other key team members. These programs are designed to enhance governance, foster collaboration, and support regulatory compliance. Training topics include effective communication and meeting management, conflict resolution, credentialing and privileging, peer review processes, roles and responsibilities, and navigating complex regulatory environments. Formats range from concise presentations to immersive multi-day retreats, and sessions are available both in person and virtually to meet the unique needs of each organization.

Erin is a member of the California Society of Healthcare Attorneys, where she serves on the Education Committee, a member of the American Health Lawyers Association, a member of the National Association of Medical Staff Services, and former chair of the Education Committee, and California Association of Medical Staff Services, where she is the current chair of the Education Committee.  Erin has been selected for inclusion in Best Lawyers in America for Health Care Law, 2021-2027.
Bar Admission
  • California, 1989
Court Admission
  • California, 1989
  • U.S. District Court, Central District of California 1989
Professional Affiliations
  • California Association of Medical Staff Services
  • National Association of Medical Staff Services
    - Chair, Education Committee 2020-2022
  • California Society for Healthcare Attorneys
    - Education Committee
  • American Health Law Association
    - Medical Staff, Peer Review & Credentialing Practice Group
Recognition
  • Selected for inclusion in Best Lawyers in America® for Health Care Law, 2021-2027
  • National Association of Medical Staff Services
    - Chair, Education Committee 2020-2022
  • California Society for Healthcare Attorneys
    Selected by Daily Journal for inclusion in, Top Health Care Lawyers, for Health Care Law, 2020