The Permanente Medical Group, Inc. | 20,901 followers on LinkedIn. The Permanente Medical Group, Inc. is the largest medical group in the United States with over 10,000 physicians. | The Permanente Medical Group (TPMG) is the largest physician-led medical group in the United States. Our nearly 10,000 physicians and 45,000 nurses and staff offer an innovative, personalized, and technologically advanced approach to health care. Serving Northern California, our team delivers superior clinical outcomes that are having life-changing effects on the health and well-being of our 4.6 million patients.