Healthcare Insights
Top 10 physician groups by the number of locations
Physician groups remain integral to the care continuum, serving as both frontline access points for routine care and specialized partners within larger health systems. Whether operating independently or within hospitals, these groups help expand access, manage costs, and deliver care across a wide range of settings.
What is a physician group?
The definition of a “physician group” can vary across organizations, and there is no universally accepted definition. For this article, Definitive Healthcare defines a physician group as one or more physicians operating as an organization to provide patient care. These groups are not otherwise classified under other firm types.
While many groups focus on outpatient services, such as primary care, internal medicine, or physical therapy, others, particularly those in specialties like anesthesiology, emergency medicine, and radiology, are embedded within hospital settings and play a critical role in inpatient care.
Physician groups vary widely in size, scope, and ownership. Some operate independently, while others are part of larger integrated delivery networks (IDNs), health systems, or backed by private equity firms. Additionally, some are supported by management services organizations (MSOs), which typically do not own the clinical entity itself but may own or manage the group's facilities, infrastructure, and non-clinical operations. This diversity in structure influences how they scale, negotiate with payers, and coordinate care across settings.
The Definitive Healthcare PhysicianGroupView product tracks over 126,000 physician groups. Below is a list of the top 10 physician groups by number of locations. A practice location refers to the specific physical address where physicians provide care.
| Rank | Physician group name | HQ city | HQ state | Main specialty | # of locations | Explore dataset |
|---|---|---|---|---|---|---|
| 1 | Ascension Medical Group | Chicago | IL | Family Practice | 1,104 | Explore |
| 2 | Intermountain Healthcare Physicians | Thornton | CO | Family Practice | 1,011 | Explore |
| 3 | MDVIP Inc | Boca Raton | FL | Internal Medicine | 910 | Explore |
| 4 | ATI Physical Therapy | Bolingbrook | IL | Therapy - Physical Therapist | 899 | Explore |
| 5 | Premise Health | Brentwood | TN | Family Practice | 863 | Explore |
| 6 | AdventHealth Medical Group | Maitland | FL | Family Practice | 774 | Explore |
| 7 | Hanger Clinic | Anniston | AL | Physical Medicine and Rehabilitation | 759 | Explore |
| 8 | Northwell Health Physician Partners | Plainview | NY | Anesthesiology - Anesthesiologist | 726 | Explore |
| 9 | Select Physical Therapy | Mechanicsburg | PA | Therapy - Physical Therapist | 703 | Explore |
| 10 | UCHealth Physicians | Denver | CO | Family Practice | 701 | Explore |
Fig 1. – Data from Definitive Healthcare PhysicianGroupView product. Physician group data is sourced from proprietary research and aggregated from provider Public Use File (PUF) data. Data accessed April 2025.
Which physician group has the most locations?
Ascension Medical Group, headquartered in Chicago, Illinois, ranks as the largest physician group on our list, with 1,104 locations. Ascension Medical Group operates as the physician services arm of Ascension, one of the nation’s largest Catholic health systems. The group offers a range of outpatient services, including family practice, internal medicine, and specialty care, aiming to provide community-oriented healthcare.
With more than 1,011 locations, Intermountain Healthcare Physicians holds the No. 2 spot among the largest physician groups tracked in our database. This Colorado-based organization operates under Intermountain Health, a nonprofit health system known for its focus on value-based care. The group offers comprehensive physician services and plays a central role in Intermountain Health’s integrated care strategy across the Mountain West.
Private equity-backed MDVIP stands apart from other top-ranking groups through its unique care model. Headquartered in Boca Raton, Florida, the group operates on a concierge-style basis. Physicians in the MDVIP network maintain smaller patient panels, offering personalized, prevention-focused care that emphasizes longer visits and stronger physician-patient relationships. With 910 locations nationwide, MDVIP has scaled a premium primary care model that caters to individuals seeking a more tailored healthcare experience.
Together, these three groups illustrate the diversity of strategies being used to expand access to physician services, from health system networks to personalized care models. As the healthcare landscape continues to evolve, their size and scale position them as key players in the delivery of health services nationwide.
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Healthcare Insights are developed with healthcare commercial intelligence from the Definitive Healthcare platform. Want even more insights? Learn three ways MSO and IPA data can help you navigate the physician group market, or start a free trial and get access to the latest healthcare intelligence on hospitals, physicians and other healthcare providers.
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