Ranked list
The 10 largest medical groups in Arizona by HCPs
The same ranking for Arizona medical groups.
Ranked listRefreshed monthly
The 10 largest medical groups in California by HCPs
The Permanente Medical Group, Inc. has the most HCPs of any medical group in California, 21,772, followed by Southern California Permanente Medical Group in Pasaden (19,499) and UCSF Pediatrics in San Francisco (5,875).
- The Permanente Medical Group, Inc.21,772HCPs12,229physicians
- Southern California Permanente Medical Group19,499HCPs11,438physicians
- UCSF Pediatrics5,875HCPs3,899physicians
- UCSF Medical Group5,736HCPs3,812physicians
- Palo Alto Foundation Medical Group5,145HCPs3,491physicians
- Stanford Health Care4,916HCPs3,272physicians
- Grow Therapy4,795HCPs19physicians
- Vituity4,475HCPs2,414physicians
- Lucile Packard Children's Hospital Stanford4,200HCPs2,800physicians
- UC San Diego Health3,488HCPs2,537physicians
The 10 highest of 10,378 California medical groups that report HCPs. Ranks compare size, not quality of care.
Every medical group in CaliforniaThe median California medical group has 4 HCPs
10,378 California medical groups report HCPs. The median medical group has 4 HCPs, so The Permanente Medical Group, Inc. is about 5,443 times that size.
- the size of the median California medical group, which has 4 HCPs
- 5,443×
- of the 10,378 California medical groups that report HCPs
- <0.1%
How we ranked the top California medical groups
- Measure
- HCPs 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
- 10,378 California medical groups in the Dmand AI database report HCPs.
- Ties
- Medical groups with the same number share a rank.
- What a rank means
- Size only. A rank compares HCPs; 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 HCPs?
The Permanente Medical Group, Inc. in Pleasanton, with 21,772 HCPs. Southern California Permanente Medical Group is second with 19,499.
What are the top 10 California medical groups by HCPs?
The Permanente Medical Group, Inc. (21,772), Southern California Permanente Medical Group (19,499), UCSF Pediatrics (5,875), UCSF Medical Group (5,736), Palo Alto Foundation Medical Group (5,145), Stanford Health Care (4,916), Grow Therapy (4,795), Vituity (4,475), Lucile Packard Children's Hospital Stanford (4,200), UC San Diego Health (3,488).
How many HCPs does a typical California medical group have?
The median California medical group that reports HCPs has 4 HCPs, out of 10,378 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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