Duet is addressing a primary-care access and sustainability problem by helping independent nurse practitioners overcome administrative, billing, credentialing, and payer-contracting barriers while its network reports 30% increases in preventive screenings, 20% fewer ER visits, and a patient NPS of 92 across about 400,000 annual visits. Its $15 million Series A, bringing total funding to $22.5 million, is funding expansion to more NP-owned clinics, deeper value-based-care insurer partnerships, engineering hiring, and a planned NP-led Medicare ACO in 2027.