Ranked list
The 10 largest medical groups in Arizona by practice locations
The same ranking for Arizona medical groups.
Ranked listRefreshed monthly
The 10 largest medical groups in California by practice locations
The Permanente Medical Group, Inc. has the most practice locations of any medical group in California, 1,324, followed by Southern California Permanente Medical Group in Pasaden (1,141) and Grow Therapy in San Jose (504). Together the 10 leaders hold 4,906 locations in ten cities.
- The Permanente Medical Group, Inc.1,324locations12,229physicians
- Southern California Permanente Medical Group1,141locations11,438physicians
- Grow Therapy504locations19physicians
- Palo Alto Foundation Medical Group373locations3,491physicians
- Vituity320locations2,414physicians
- Vituity296locations2,005physicians
- UCSF Medical Group278locations3,812physicians
- Optum - Downtown Los Angeles241locations1,573physicians
- UC Davis Medical Group216locations2,107physicians
- Adventist Health Physicians Network213locations664physicians
The 10 highest of 10,376 California medical groups that report practice locations. Ranks compare size, not quality of care.
Every medical group in CaliforniaThe 10 top California medical groups hold 12% of all practice locations
10,376 California medical groups report practice locations, 41,842 practice locations in all. The 10 on this list hold 4,906 of it. The median medical group has 1 location, so The Permanente Medical Group, Inc. is about 1,324 times that size.
- of all practice locations at California medical groups that report them
- 12%
- the size of the median California medical group, which has 1 location
- 1,324×
- of the 10,376 California medical groups that report practice locations
- <0.1%
How we ranked the top California medical groups
- Measure
- Practice locations on file for each group.
- What counts as a group
- One Medicare PAC ID. A group that bills under several names counts once.
- Field
- 10,376 California medical groups in the Dmand AI database report practice locations.
- Ties
- Medical groups with the same number share a rank.
- What a rank means
- Size only. A rank compares practice locations; it says nothing about quality of care.
- Refresh
- Monthly. Updated Oct 28, 2026.
FAQ
Questions about the top California medical groups
Answers from the same data, updated monthly.
Which California medical group has the most practice locations?
The Permanente Medical Group, Inc. in Pleasanton, with 1,324 locations. Southern California Permanente Medical Group is second with 1,141.
What are the top 10 California medical groups by practice locations?
The Permanente Medical Group, Inc. (1,324), Southern California Permanente Medical Group (1,141), Grow Therapy (504), Palo Alto Foundation Medical Group (373), Vituity (320), Vituity (296), UCSF Medical Group (278), Optum - Downtown Los Angeles (241), UC Davis Medical Group (216), Adventist Health Physicians Network (213).
How many practice locations does a typical California medical group have?
The median California medical group that reports practice locations has 1 location, out of 10,376 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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The 10 largest medical groups in the US by practice locations
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