Largest pathology and laboratory groups in California
- Groups
- 111
- Pathology groups
- 111
- Pathology specialists
- 695
- Physicians
- 755
- More than one site
- 56
There are 111 pathology and laboratory groups in California with a Medicare PAC ID. UCLA Department of Pathology and Laboratory is the largest, with 79 physicians.
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UCLA Department of Pathology and Laboratory is the largest pathology and laboratory group in California, with 79 physicians
Ranked by physicians with a California address linked to each group. UCI Health Pathology and Laboratory Services (Department of Pathology & Laboratory Science) is second with 69, and UCI Health Pathology and Laboratory Services third with 69.
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Showing 1 to 10 of 111 pathology and laboratory groups in California
Sources: Doctors and Clinicians National Downloadable File (CMS) and Dmand AI Affiliation Data
UC Irvine has the most physicians in California pathology and laboratory groups, with 80 across 2 groups
Dmand AI maps every medical group to its parent organization, up to the health system or platform at the top. 4 parent organizations have two or more California pathology and laboratory groups. Each clinician counts once per parent organization.
See every medical group, site and clinician under UC Irvine
Org Hierarchy Explorer maps every group, site of care and clinician under the parent, with the leaders at each group.
Source: Dmand AI Org Hierarchy Data
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Dmand AI maps the owners, administrators and physician leaders at each of the 111 California pathology and laboratory groups, with the parent organization above each one, and finds validated work emails and mobile numbers.
67% of California pathology and laboratory groups are independent, with no larger parent organization
A group counts as independent when no health system, platform or other organization sits above it in the org hierarchy. Every other group belongs to a larger organization.
California pathology and laboratory groups by ownership
- Independent74
- Health system or hospital14
- Community or government1
- Other organization22
Sites of care beyond their own offices
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Dmand AI maps each group to the health system, physician platform or management company above it, so you can sell to the owner, not one site.
Source: Dmand AI Org Hierarchy Data
70 California pathology and laboratory groups practice at a hospital site, and 2 at a surgery center
Sites of care linked to each group in the org hierarchy, beyond its own offices. A group can practice at several kinds of site.
California pathology and laboratory groups by site of care
- Hospitals70
- Ambulatory surgery centers2
- Skilled nursing facilities1
Clinicians in California pathology and laboratory groups
Sources: Dmand AI Practice Data and Dmand AI Org Hierarchy Data
Los Angeles has the most pathology and laboratory groups in California, with 9
More California cities with pathology and laboratory groups
- Bakersfield2
- Glendale2
- Modesto2
- Orange2
- Pasadena2
- Pomona2
- Salinas2
- San Luis Obispo2
- Victorville2
- Westminster2
- Alameda1
- Anaheim1
- Arcadia1
- Burbank1
- Burlingame1
Source: Doctors and Clinicians National Downloadable File (CMS)
Each California pathology and laboratory group profile shows the parent, sites, clinicians and identifiers
- Clinicians and specialtiesA count by specialty and a sample of the group's cliniciansOn every profile
- Practice locationsMain site and a sample of practice locations, with a count of the restOn every profile
- Medicare Part B paymentsMedicare payments to the group, from CMSOn every profile
- Group NPI and Medicare PAC IDIdentifiers for matching records across sourcesOn every profile
- Parent organizationThe health system, platform or owner above the groupOn every profile
- Every clinician and siteThe full roster and every practice locationWith a free account
- Leader and clinician contactsWork emails and mobile numbers, found on request and then validatedWith a free account
- EHR used by the group's cliniciansThe EHR in use at the group's sitesWith a free account
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Sources: Doctors and Clinicians National Downloadable File (CMS), Medicare Physician & Other Practitioners (CMS) and Dmand AI Org Hierarchy Data
Sources for the California pathology and laboratory group list
| Data on this page | Source |
|---|---|
| Medical groups, specialties and sites | Doctors and Clinicians National Downloadable File (CMS) and Dmand AI Professional Profile Data |
| Parent organizations and independence | Dmand AI Org Hierarchy Data |
| Physicians and HCPs | Dmand AI Affiliation Data |
| Group NPI and PAC ID | NPPES NPI Registry (CMS) and Doctors and Clinicians National Downloadable File (CMS) |
Data last refreshed October 2026Report an inaccuracyRemove my information
Groups whose main specialty is pathology and laboratory and that have a Medicare PAC ID.
FAQ
Frequently asked questions about pathology and laboratory groups in California
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
How many pathology and laboratory groups are in California?
There are 111 pathology and laboratory groups in California with a Medicare PAC ID. Between them they have 695 pathology specialists.
Which companies own the most pathology and laboratory groups?
By physicians, UC Irvine, with 80 across 2 groups, followed by Yosemite Pathology Med Group with 70 and CommonSpirit Health with 7.
How many California pathology and laboratory groups are independent?
74, or 67%, have no larger parent organization in the Dmand AI org hierarchy. 14 belong to a health system or hospital.
Why are pathology and laboratory listed together?
They share one specialty category in the Dmand AI medical group data. Each group is listed under its main specialty.
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