Medical groups in Ontario, CA
- Medical groups
- 30
- Multi-specialty
- 7
- Single-specialty
- 23
- More than one site
- 13
There are 30 medical groups in Ontario with a Medicare PAC ID. Unicare Community Health Center is the largest, with 53 California physicians, followed by Physicians of Southern California with 10. 57% of Ontario groups are independent.
Find the decision makers at all 30 Ontario medical groups
Work emails and mobile numbers for practice owners, administrators and physician leaders, found through healthcare waterfall enrichment, with a free Dmand AI account.
Unicare Community Health Center is the largest medical group in Ontario, with 53 physicians
Ranked by physicians with a California address linked to each group based in Ontario. Physicians of Southern California is second with 10, and Wound Healing Care Specialists third with 9.
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Sort and filter all 30 Ontario medical groups by specialty, parent organization, group size, EHR in use and decision makers in Dmand AI.
Showing 1 to 10 of 30 medical groups in Ontario
Sources: Doctors and Clinicians National Downloadable File (CMS) and Dmand AI Affiliation Data
Wound Healing Care Specialists has the most physicians in Ontario medical groups, with 9 across 4 groups
Dmand AI maps every Ontario medical group to its parent organization, up to the health system or platform at the top. 2 parent organizations have two or more Ontario medical groups. Among health systems, Prime Healthcare Services has the most groups, 3. Each clinician counts once per parent organization.
- Wound Healing Care Specialists
- Wound Healing Care Specialists
- Wound Healing Care Specialists
- 2 more Ontario groups and their practice sites
See every medical group, site and clinician under Wound Healing Care Specialists
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
For sales teams
Dmand AI maps the owners, administrators and physician leaders at each of the 30 Ontario medical groups, with the parent organization above each one, and finds validated work emails and mobile numbers.
57% of Ontario 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.
Ontario medical groups by ownership
- Independent17
- Health system or hospital3
- Platform or corporate owner6
- Community or government2
- Other organization2
Source: Dmand AI Org Hierarchy Data
4 Ontario 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.
Ontario medical groups by site of care
- Hospitals4
- Behavioral health facilities3
- FQHCs1
- Rural health clinics1
Sources: Dmand AI Practice Data and Dmand AI Org Hierarchy Data
Primary care groups are the most common medical groups in Ontario, with 13
Each group is counted once, under its main specialty. Behavioral and mental health groups are second, with 7, and 7 Ontario groups are multi-specialty.
- Primary care13
- Behavioral and mental health7
- Anesthesia and pain2
- Radiology and imaging2
- Chiropractic1
- Emergency and hospital medicine1
- Eye care1
- Podiatry1
- Rehabilitation and therapy1
- General and specialty surgery1
Source: Dmand AI Professional Profile Data
434 California HCPs work in Ontario medical groups, 93 of them physicians
Each clinician is counted once, across every Ontario group they are linked to. Only clinicians with a California address are counted.
HCPs in Ontario medical groups by type
- Behavioral health clinicians171
- Physicians (MD, DO)93
- Nurses and nurse practitioners76
- Physician assistants48
- Podiatrists15
- Other HCPs31
Source: Dmand AI Affiliation Data
Each Ontario 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
Free account: 30 days free, self-serve, no credit card.
Sources: Doctors and Clinicians National Downloadable File (CMS), Medicare Physician & Other Practitioners (CMS) and Dmand AI Org Hierarchy Data
Sources for the Ontario 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 Ontario with a Medicare PAC ID.
FAQ
Frequently asked questions about medical groups in Ontario
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 Ontario?
There are 30 medical groups based in Ontario with a Medicare PAC ID: 7 multi-specialty and 23 single-specialty. 13 of them have more than one site.
What is the largest medical group in Ontario?
Unicare Community Health Center, with 53 physicians and 160 HCPs with a California address. Physicians of Southern California is second with 10, and Wound Healing Care Specialists is third with 9.
Which health system has the most medical groups in Ontario?
By physicians, Wound Healing Care Specialists, with 9 across 4 groups, followed by Prime Healthcare Services with 0.
How many Ontario medical groups are independent?
17, or 57%, have no larger parent organization in the Dmand AI org hierarchy. 3 belong to a health system or hospital and 6 to a physician platform or corporate owner.
How many Ontario medical groups practice at a hospital?
4 Ontario 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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