The 10 largest medical groups in California by physicians
The Permanente Medical Group, Inc. is the largest medical group in California, with 12,229 physicians, followed by Southern California Permanente Medical Group in Pasaden (11,438) and UCSF Pediatrics in San Francisco (3,899).
- The Permanente Medical Group, Inc.12,229physicians21,772HCPs
- Southern California Permanente Medical Group11,438physicians19,499HCPs
- UCSF Pediatrics3,899physicians5,875HCPs
- UCSF Medical Group3,812physicians5,736HCPs
- Palo Alto Foundation Medical Group3,491physicians5,145HCPs
- Stanford Health Care3,272physicians4,916HCPs
- Lucile Packard Children's Hospital Stanford2,800physicians4,200HCPs
- UC San Diego Health2,537physicians3,488HCPs
- Vituity2,414physicians4,475HCPs
- UC Davis Medical Group2,107physicians2,855HCPs
The 10 largest of 7,616 California medical groups that report physicians. Ranks compare size, not quality of care.
Every medical group in CaliforniaThe median California medical group has 3 physicians
7,616 California 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 California medical group, which has 3 physicians
- 4,076×
- of the 7,616 California medical groups that report physicians
- 0.1%
How we ranked the largest California 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
- 7,616 California 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 California medical groups
Answers from the same data, updated monthly.
What is the largest medical group in California?
The Permanente Medical Group, Inc. in Pleasanton, with 12,229 physicians. Southern California Permanente Medical Group is second with 11,438.
What are the 10 largest medical groups in California?
By physicians: The Permanente Medical Group, Inc. (12,229), Southern California Permanente Medical Group (11,438), UCSF Pediatrics (3,899), UCSF Medical Group (3,812), Palo Alto Foundation Medical Group (3,491), Stanford Health Care (3,272), Lucile Packard Children's Hospital Stanford (2,800), UC San Diego Health (2,537), Vituity (2,414), UC Davis Medical Group (2,107).
How many physicians does a typical California medical group have?
The median California medical group that reports physicians has 3 physicians, out of 7,616 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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