Medical groups in Walnut Creek, CA
- Medical groups
- 57
- Multi-specialty
- 14
- Single-specialty
- 43
- More than one site
- 32
- 100+ physicians
- 6
There are 57 medical groups in Walnut Creek with a Medicare PAC ID. John Muir Health is the largest, with 703 California physicians, followed by John Muir Medical Group with 558. 74% of Walnut Creek groups are independent.
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John Muir Health is the largest medical group in Walnut Creek, with 703 physicians
Ranked by physicians with a California address linked to each group based in Walnut Creek. John Muir Medical Group is second with 558, and BASS Medical Group third with 283. 6 Walnut Creek groups have 100 or more physicians.
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Sort and filter all 57 Walnut Creek medical groups by specialty, parent organization, group size, EHR in use and decision makers in Dmand AI.
Showing 1 to 10 of 57 medical groups in Walnut Creek
Sources: Doctors and Clinicians National Downloadable File (CMS) and Dmand AI Affiliation Data
John Muir Health has the most physicians in Walnut Creek medical groups, with 1,070 across 5 groups
Dmand AI maps every Walnut Creek medical group to its parent organization, up to the health system or platform at the top. 2 parent organizations have two or more Walnut Creek medical groups. Each clinician counts once per parent organization.
See every medical group, site and clinician under John Muir Health
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 57 Walnut Creek medical groups, with the parent organization above each one, and finds validated work emails and mobile numbers.
74% of Walnut Creek medical 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.
Walnut Creek medical groups by ownership
- Independent42
- Health system or hospital5
- Platform or corporate owner7
- Other organization3
Source: Dmand AI Org Hierarchy Data
13 Walnut Creek medical groups practice at a hospital site
Beyond their own offices, groups practice at the sites of care linked to them in the org hierarchy. A group can practice at several kinds of site, so the shares overlap.
Walnut Creek medical groups by site of care
- Hospitals13
- Ambulatory surgery centers2
- Therapy and rehab centers2
- Skilled nursing facilities1
- Behavioral health facilities1
Sources: Dmand AI Practice Data and Dmand AI Org Hierarchy Data
Primary care groups are the most common medical groups in Walnut Creek, with 16
Each group is counted once, under its main specialty. Rehabilitation and therapy groups are second, with 9, and 14 Walnut Creek groups are multi-specialty.
- Primary care16
- Rehabilitation and therapy9
- Eye care8
- Behavioral and mental health6
- Radiology and imaging4
- Chiropractic3
- Dermatology3
- Anesthesia and pain1
- Dental and oral surgery1
- ENT and audiology1
- Neurology and neurosurgery1
- OB/GYN and women's health1
- Pathology and laboratory1
- Podiatry1
- Rheumatology, allergy and immunology1
Source: Dmand AI Professional Profile Data
2,584 California HCPs work in Walnut Creek medical groups, 1,710 of them physicians
Each clinician is counted once, across every Walnut Creek group they are linked to. Only clinicians with a California address are counted.
HCPs in Walnut Creek medical groups by type
- Physicians (MD, DO)1,710
- Nurses and nurse practitioners234
- Physician assistants233
- Therapists (PT and OT)201
- Non-clinical and support staff52
- Other HCPs154
Source: Dmand AI Affiliation Data
Each Walnut Creek medical 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 Walnut Creek medical group directory
| 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
The directory lists groups based in Walnut Creek with a Medicare PAC ID.
FAQ
Frequently asked questions about medical groups in Walnut Creek
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
How many medical groups are in Walnut Creek?
There are 57 medical groups based in Walnut Creek with a Medicare PAC ID: 14 multi-specialty and 43 single-specialty. 32 of them have more than one site.
What is the largest medical group in Walnut Creek?
John Muir Health, with 703 physicians and 742 HCPs with a California address. John Muir Medical Group is second with 558, and BASS Medical Group is third with 283.
Which health system has the most medical groups in Walnut Creek?
By physicians, John Muir Health, with 1,070 across 5 groups, followed by Privia Health with 283.
How many Walnut Creek medical groups are independent?
42, or 74%, have no larger parent organization in the Dmand AI org hierarchy. 5 belong to a health system or hospital and 7 to a physician platform or corporate owner.
How many Walnut Creek medical groups practice at a hospital?
13 Walnut Creek groups practice at a hospital site linked to them in the Dmand AI org hierarchy.
How do I find a medical group's NPI or PAC ID?
Each medical group profile lists the group NPI and Medicare PAC ID at the top, with the main address and phone number. The NPI comes from the NPPES NPI Registry and the PAC ID from CMS Medicare enrollment.
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