Medical groups in Oak Brook, IL
- Medical groups
- 117
- Multi-specialty
- 3
- Single-specialty
- 114
- More than one site
- 34
- 100+ physicians
- 1
There are 117 medical groups in Oak Brook with a Medicare PAC ID. Nephrology Associates of Northern Illinois and Indiana (NANI) is the largest, with 115 Illinois physicians, followed by Advance Inpatient Medicine with 46. 21% of Oak Brook groups are independent.
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Nephrology Associates of Northern Illinois and Indiana (NANI) is the largest medical group in Oak Brook, with 115 physicians
Ranked by physicians with an Illinois address linked to each group based in Oak Brook. Advance Inpatient Medicine is second with 46, and Radiation Oncology Consultants third with 29. 1 Oak Brook group has 100 or more physicians.
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Sort and filter all 117 Oak Brook medical groups by specialty, parent organization, group size, EHR in use and decision makers in Dmand AI.
Showing 1 to 10 of 117 medical groups in Oak Brook
Sources: Doctors and Clinicians National Downloadable File (CMS) and Dmand AI Affiliation Data
Geode Health has the most physicians in Oak Brook medical groups, with 13 across 5 groups
Dmand AI maps every Oak Brook medical group to its parent organization, up to the health system or platform at the top. 4 parent organizations have two or more Oak Brook medical groups. Each clinician counts once per parent organization.
See every medical group, site and clinician under Geode 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 117 Oak Brook medical groups, with the parent organization above each one, and finds validated work emails and mobile numbers.
21% of Oak Brook 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.
Oak Brook medical groups by ownership
- Independent25
- Health system or hospital1
- Platform or corporate owner91
Source: Dmand AI Org Hierarchy Data
9 Oak Brook 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.
Oak Brook medical groups by site of care
- Hospitals9
- Ambulatory surgery centers3
- Dialysis centers3
- Therapy and rehab centers2
- Behavioral health facilities2
- Skilled nursing facilities1
Sources: Dmand AI Practice Data and Dmand AI Org Hierarchy Data
Chiropractic groups are the most common medical groups in Oak Brook, with 73
Each group is counted once, under its main specialty. Behavioral and mental health groups are second, with 15, and 3 Oak Brook groups are multi-specialty.
- Chiropractic73
- Behavioral and mental health15
- Primary care11
- Rehabilitation and therapy11
- Anesthesia and pain2
- Radiology and imaging2
- Eye care1
- Pathology and laboratory1
- Podiatry1
Source: Dmand AI Professional Profile Data
1,504 Illinois HCPs work in Oak Brook medical groups, 286 of them physicians
Each clinician is counted once, across every Oak Brook group they are linked to. Only clinicians with an Illinois address are counted.
HCPs in Oak Brook medical groups by type
- Therapists (PT and OT)869
- Physicians (MD, DO)286
- Nurses and nurse practitioners146
- Behavioral health clinicians110
- Chiropractors61
- Other HCPs32
Source: Dmand AI Affiliation Data
Each Oak Brook 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 Oak Brook 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 Oak Brook with a Medicare PAC ID.
FAQ
Frequently asked questions about medical groups in Oak Brook
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 Oak Brook?
There are 117 medical groups based in Oak Brook with a Medicare PAC ID: 3 multi-specialty and 114 single-specialty. 34 of them have more than one site.
What is the largest medical group in Oak Brook?
Nephrology Associates of Northern Illinois and Indiana (NANI), with 115 physicians and 155 HCPs with an Illinois address. Advance Inpatient Medicine is second with 46, and Radiation Oncology Consultants is third with 29.
Which health system has the most medical groups in Oak Brook?
By physicians, Geode Health, with 13 across 5 groups, followed by Athletico with 5 and TVG-Medulla with 0.
How many Oak Brook medical groups are independent?
25, or 21%, have no larger parent organization in the Dmand AI org hierarchy. 1 belong to a health system or hospital and 91 to a physician platform or corporate owner.
How many Oak Brook medical groups practice at a hospital?
9 Oak Brook 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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