Largest Medical Groups
As healthcare consolidates, more physicians are shifting from smaller practices to larger ones. This shift is due to improved administrative support, better patient care, and lower cost.
These groups can be large hospital or health system-affiliated organizations, contract management groups (CMGs) or individual physician practices. Definitive Healthcare tracks more than 125,000 of these groups and estimates that the largest medical group has approximately 12,000 doctors.
MedStar Medical Group
MedStar Health is the largest medical group based in Maryland and Washington, D.C., with more than 3400 physicians and 300 locations. The system includes a variety of hospitals, multispecialty centres, and home care.
The health system is a leader for patient care, research, and education. The MedStar philosophy of putting patients first is supported by its more than 31,000 employees.
The organization’s commitment to a patient first culture, which values quality of care, compassion and clinical excellence, with an emphasis on customer services, is a key part of that philosophy. This philosophy has made MedStar one of the most desirable places to work in healthcare for many years.
The organization’s patient-first culture also includes its commitment to quality and safety. This includes ensuring that patients’ medical records are secure, as well as preventing fraud, theft, and abuse of personal data.
MedStar has made several changes to its supply chain operations in an effort reduce costs and increase efficiency. For example, it has transitioned from an outdated ERP to a Cerner system.
The supply chain team has access to a wealth if information thanks to the change. This allows them identify and remove products that do not comply with MedStar’s standardized protocols. This allows them to better manage their product inventory.
The supply chain team will be able to better coordinate deliveries and ensure patients get their medications as prescribed by having a better understanding about product usage. This will reduce costs for both the healthcare system and patients.
This will also benefit the doctors that are a part of the system. This will allow them spend less time chasing orders and more time caring for their patients.
MedStar also launched an app that allows patients to book appointments and access their medical records. This is a convenient way to make the most of their visits and take advantage of new technology, such as digital wallets for storing copies of their vaccination cards or insurance information.
MaineHealth Medical Group
MaineHealth is the largest integrated health system in Northern New England. It has nine local health networks, a behavioral healthcare network and home health agencies. MaineHealth was founded with the vision of “Working together so our communities are the healthiest in America.” It provides preventive, diagnosis and treatment services to New Hampshire’s 1.1 million residents.
MaineHealth Medical Group’s clinicians are dedicated to providing excellent patient care in a compassionate and patient-centered way. Our mission is to deliver quality care, improve the patient experience and advance medical knowledge while providing an environment that promotes transparency, communication and innovation.
MHMG uses a team approach to care, ensuring seamless care in all of our Local Health Systems and communities. MHMG’s offices are located at each MaineHealth system’s 10 hospitals as well as at more than 200 primary and specialty care practices throughout the state and New Hampshire.

Our physicians are leaders in their fields and aspire to be the best. MHMG, a physician-led, physician driven organization, unites the best physicians at MaineHealth with a common goal of improving and advancing medical care.
MaineHealth offers several programs to support providers in developing and growing their practices. These programs include the Innovation Cohort, and the Intellectual Property division. They are designed to support care team members in user discovery and prototyping.
Amy Ottolini and Michael Ferguson led a project that turned their idea for an augmented-reality training device for neonatal survival into a working prototype. Augmented Technology for Medical Simulation uses Microsoft Hololens mixed reality goggles, Empatica wristwatches and Case Western Reserve University augmented reality software to simulate a neonatal emergency situation.
The MaineHealth Innovation team can help you find a better way to deliver care, a more efficient process, or a product that will make your life easier. The department has collaborated with 49 innovators to complete 34 projects, filed 11 patents and invested more than $337,000 in those projects.
Permanente Medical Group
The largest medical group in the United States is Kaiser Permanente, which has over 12 million members. Through its network of hospitals, medical offices and clinics, it provides health care services for its patients.
Kaiser is an American not-for profit healthcare organization that operates in eight states. The company offers prepaid insurance, health plans, and medical care to its members.
The company is made up of two or three separate but interdependent legal entities in each region. These are Kaiser Foundation Health Plans, (KFHP), as well as the eight Permanente Medical Groups. These groups oversee a wide range medical services within their respective territories.
Each of the eight PMGs has a unique business model that promotes quality and value in patient care. The organizations work together to optimize the delivery of Permanente Medicine – medicine that is person and family-centered, evidence-based, technology enabled, culturally responsive, team delivered and physician led.
KP uses a rigorous process to evaluate and deploy new technologies to ensure its physicians have the most up-to-date tools and devices. This helps to ensure that members receive high quality care.
The company offers a wide range of clinical specialties as well as emergency care, women’s care, cancer care and pediatric services. The organization employs over 8,000 physicians and nurses.
The company has been in operation since 1955 and is based in Oakland, California. The eight medical groups of the company serve more than 12.2 millions members in all 50 US states and District of Columbia.
It has more than 11,000 physicians and 40,000 staff in its Northern California, Maryland, Virginia and Washington, D.C., areas. The company’s Get Care Now digital front door for virtual care has been in operation since late fall of 2021 and has had more than 3.2 million visits from 2.5 million members seeking guidance on how to manage their common health concerns.
The company also offers a range of medical devices, including blood pressure monitors and glucose monitoring kits. The company also has a team of experts in the field that works to provide assistance with the use of these items. The company’s centralized network of labs and pharmacies also help members to access medical supplies.
Atrius Health
Atrius Health is a leader in nonprofit healthcare. It provides connected care for more that 720,000 patients, both pediatric and adult, in eastern Massachusetts. The 32 medical practices and the subsidiary VNA Care offer a wide range services in close collaboration to hospital partners, community specialists, and skilled nursing facilities.
Atrius is committed to a policy of non-discrimination and equal employment opportunity. It stands by the values of patient-centered, quality, integrity and stewardship, compassion diversity, innovation, service and workplace.
The organization is based out of Newton, Massachusetts and is an affiliated of UnitedHealth Group. Its primary focus lies in building the nation’s best value-based care system.
In addition to primary care and specialty services, Atrius provides a full suite of pharmacy and imaging products. It also has an innovative approach to care management that enables the company to deliver high-quality, cost-effective care to patients.
Atrius Health supports its mission of improving lives by providing integrated healthcare across the healthcare continuum. It also builds trust between providers with patients to help them achieve their goals. The team-based, coordinated care approach ensures that patients receive the best treatment possible at the right place and time.
Atrius Health launched its Care in Place program to improve patient experience and lower health care costs. It aims to reduce hospital admissions and emergency department (ER) visits. The project includes home visits with nurse practitioners as well as a survey that measures the outcomes of treatment.
Atrius Health and its Innovation Center consulted with clinic executives to determine their priorities during the development phase. They worked together to ensure that the goals were in line with the clinic’s key performance measures.
For example, the innovation center identified a clinic that was in need of a home visit with a nurse practitioner. The team contacted the clinic and offered to prototype the visit. The project has been a success, with clinicians reporting that patients have had reduced ER visits and have reported improved overall well-being.
The company also plans on expanding its relationships with socially determinants of healthcare providers. To prioritize these needs in its MCOs and ACO populations, it is partnering up with the Tufts Health Plan Partnership.