Permanente Medical Groups Form Affiliation

Oregon-based Northwest Permanente (NWP) and The Permanente Medical Group (TPMG) of Northern California have announced a formal affiliation. 

NWP is the largest independent multispecialty medical group in Oregon and southwest Washington. Its more than 1,300 physicians span 54 specialties and provide care for more than 612,000 Kaiser Permanente members in the region. TPMG comprises nearly 10,000 physicians in 116 specialties, providing care for 4.6 million members in California.

Both are physician-led, independent Permanente Medical Groups that partner exclusively with Kaiser Foundation Health Plan to provide care for their patients in Oregon, southwest Washington, and Northern California.

“Consolidation of hospitals, medical groups, and health plans are occurring throughout the United States,” said Leong Koh, M.D., executive medical director of Northwest Permanente, in a statement. “Most transactions are largely focused on size, scale, and finance. What is different and exciting about our affiliation is our shared belief in value-based care. Both of our groups have walked the walk and have achieved superior and equitable patient outcomes, created fulfilling environments to practice medicine, and committed to managing the costs associated with care.”

Following the affiliation, Maria Ansari, M.D., CEO and executive director of TPMG  and president and CEO of Mid-Atlantic Permanente Medical Group (MAPMG), assumed the role of CEO of Northwest Permanente. Ansari also serves as co-CEO of The Permanente Federation, the national leadership and consulting organization for the Permanente Medical Groups, which, with the Kaiser Foundation Health Plan and Kaiser Foundation Hospitals, comprise Kaiser Permanente.

“Innovations and performance accelerate when like-minded physicians come together,” said Ansari in a statement. “Maintaining the independence to practice the medicine we believe in is truly the promise of Permanente Medicine. Through this affiliation, we will bring cutting-edge IT, virtual care capabilities, and more than 100 specialties and subspecialties to benefit the patients and communities of Oregon and southwest Washington.”

The affiliation transaction was approved by the Oregon Health Authority’s Healthcare Market Oversight Program (HCMO) on April 11, 2025.