Nathan concentrates in healthcare law, including Medicare, Medicaid, managed care, third-party reimbursement, federal and state regulatory compliance, fraud and abuse, self-referral prohibitions, privacy and confidentiality requirements, patient rights and clinical ethics, medical staff privileges, healthcare contracts, "certificate of public need" proposals, reproductive medicine, healthcare antitrust, HIPAA, EMTALA, healthcare professional education accreditation, and advance directives. Nathan’s clients include health systems, hospitals, specialized medical practices, mental health services providers, pharmacies and universities.