root-cause-medicine
(3)
The Lanby
The Lanby is a membership-based, hospitality-led primary care practice in New York City that reimagines concierge medicine for a modern, prevention-minded patient. Founded in 2021 by breast cancer survivor Chloe Harrouche, it pairs every member with a dedicated care team - a lead physician, wellness advisor, medical assistant, physician associate, and member advocate - to connect the dots across medicine, wellness, and care coordination. For a flat annual fee and no insurance friction, members get unlimited visits, advanced diagnostics with 85+ biomarkers, personalized care plans, and expedited specialist referrals.
Parsley Health
Parsley Health is a functional-medicine telehealth provider founded in 2016 by physician Dr. Robin Berzin. It pairs in-depth diagnostics and biomarker testing with longitudinal, team-based care - doctors plus health coaches - to find and treat the root causes of chronic conditions like gut, autoimmune, hormonal, metabolic and mental-health issues, rather than just managing symptoms. Originally a cash-pay membership model with clinics in New York and Los Angeles, Parsley has shifted to a virtual-first national service and in 2026 became the first functional-medicine provider to accept insurance in-network nationwide, putting its care within reach of roughly 150 million insured Americans.
Robin Berzin
Robin Berzin is the founder and CEO of Parsley Health, a holistic, root-cause medical practice she launched in 2016 to make functional medicine modern, data-driven, and reachable online nationwide. A Columbia-trained physician who started out chasing securities fraud as a paralegal at the U.S. Attorney's office, she co-founded the doctor-messaging app Cureatr in medical school before building Parsley into one of the largest functional medicine practices in the country. She is the author of State Change, a World Economic Forum Tech Pioneer, and one of Inc.'s 100 most innovative women in business.