Ranked list
The 10 largest medical groups in California
The same ranking for California medical groups.
Ranked listRefreshed monthly
The 10 largest medical groups in the US by physicians
The Permanente Medical Group, Inc. is the largest medical group in the US, with 12,229 physicians, followed by Southern California Permanente Medical Group in Pasaden (11,438) and Northwell Health Physician Partners Cardiology at Great Neck in Westbury (6,536). The 10 are in seven states.
- The Permanente Medical Group, Inc.12,229physicians21,772HCPs
- Southern California Permanente Medical Group11,438physicians19,499HCPs
- Northwell Health Physician Partners Cardiology at Great Neck6,536physicians11,817HCPs
- NYU Langone Orthopedic Surgery Associates5,858physicians9,874HCPs
- University of Pittsburgh Physicians, Department of Radiology4,597physicians8,411HCPs
- Massachusetts General Physicians Organization (MGPO)4,510physicians6,747HCPs
- Mayo Clinic4,502physicians6,994HCPs
- Cleveland Clinic4,501physicians8,431HCPs
- Massachusetts General Hospital4,416physicians6,587HCPs
- University of Texas Southwestern Medical Center3,957physicians5,932HCPs
The 10 largest of 71,361 US medical groups that report physicians. Ranks compare size, not quality of care.
Every US medical group in the directoryThe median US medical group has 3 physicians
71,361 US medical groups report physicians. The median medical group has 3 physicians, so The Permanente Medical Group, Inc. is about 4,076 times that size.
- the size of the median US medical group, which has 3 physicians
- 4,076×
- of the 71,361 US medical groups that report physicians
- <0.1%
How we ranked the largest US medical groups
- Measure
- Physicians linked to each group in CMS enrollment and the Dmand AI database.
- What counts as a group
- One Medicare PAC ID. A group that bills under several names counts once.
- Field
- 71,361 US medical groups in the Dmand AI database report physicians.
- Ties
- Medical groups with the same number share a rank.
- HCPs
- Healthcare professionals with a current link to the group in the Dmand AI database.
- What a rank means
- Size only. A rank compares physicians; it says nothing about quality of care.
- Refresh
- Monthly. Updated Oct 28, 2026.
FAQ
Questions about the largest US medical groups
Answers from the same data, updated monthly.
What is the largest medical group in the US?
The Permanente Medical Group, Inc. in Pleasanton, California, with 12,229 physicians. Southern California Permanente Medical Group is second with 11,438.
What are the 10 largest medical groups in the US?
By physicians: The Permanente Medical Group, Inc. (12,229), Southern California Permanente Medical Group (11,438), Northwell Health Physician Partners Cardiology at Great Neck (6,536), NYU Langone Orthopedic Surgery Associates (5,858), University of Pittsburgh Physicians, Department of Radiology (4,597), Massachusetts General Physicians Organization (MGPO) (4,510), Mayo Clinic (4,502), Cleveland Clinic (4,501), Massachusetts General Hospital (4,416), University of Texas Southwestern Medical Center (3,957).
Which state has the most of the 10 largest medical groups?
California, Massachusetts and New York, with two each.
How many physicians does a typical US medical group have?
The median US medical group that reports physicians has 3 physicians, out of 71,361 that report them.
How often is this list updated?
Every month, when the Dmand AI database refreshes. This version is from Oct 28, 2026.
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