Largest OB/GYN and women's health groups in the US
- Groups
- 2,110
- Obstetrics and Gynecology groups
- 1,881
- Advanced Practice Midwife groups
- 229
- OB-GYNs
- 16,353
- Advanced practice midwife specialists
- 760
There are 2,110 OB/GYN and women's health groups in the US with a Medicare PAC ID: 1,881 obstetrics and gynecology and 229 advanced practice midwife. Ob Hospitalist Group is the largest obstetrics and gynecology group, with 862 OB-GYNs, and Diana Health the largest advanced practice midwife group, with 47 advanced practice midwife specialists.
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Ob Hospitalist Group is the largest obstetrics and gynecology group in the US, with 862 OB-GYNs
Ranked by OB-GYNs linked to each group whose main sub-specialty is obstetrics and gynecology. Ob Hospitalist Group is second with 565, and Ob Hospitalist Group third with 550.
Sources: Doctors and Clinicians National Downloadable File (CMS) and Dmand AI Affiliation Data
Diana Health is the largest advanced practice midwife group in the US, with 47 advanced practice midwife specialists
Ranked by advanced practice midwife specialists linked to each group whose main sub-specialty is advanced practice midwife. Diana Health is second with 39, and Planned Parenthood of Southern New England third with 30.
Sources: Doctors and Clinicians National Downloadable File (CMS) and Dmand AI Affiliation Data
Texas has the most OB/GYN and women's health groups, with 239
California is second with 186 and New York third with 167. Every state with 5 or more groups has its own list.
- Texas239
- California186
- New York167
- Florida129
- Georgia112
- Illinois86
- Tennessee68
- South Carolina66
- Michigan65
- Alabama63
- New Jersey59
- Ohio59
- Massachusetts57
- Louisiana56
- Arizona55
- North Carolina52
- Virginia44
- Mississippi36
- Indiana29
- Maryland27
- Missouri27
- Pennsylvania27
- Oregon26
- Colorado25
- Nevada24
- Oklahoma23
- Arkansas22
- Kansas21
- Utah20
- Iowa18
- Washington17
- Alaska16
- Nebraska16
- Idaho15
- Puerto Rico15
- Hawaii14
- Kentucky14
- Wisconsin13
- Montana12
- New Mexico12
- Connecticut11
- Delaware9
- Minnesota9
- New Hampshire9
- West Virginia9
- Wyoming9
- Maine5
- Vermont5
- Washington, DC4
- Rhode Island4
- U.S. Virgin Islands2
- North Dakota1
- South Dakota1
Source: Doctors and Clinicians National Downloadable File (CMS)
OB Hospitalist Group has the most physicians in US OB/GYN and women's health groups, with 4,485 across 45 groups
71 parent organizations have two or more US OB/GYN and women's health groups. Among health systems, HCA Healthcare has the most groups, 32. Each clinician counts once per parent organization.
See every medical group, site and clinician under OB Hospitalist Group
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 2,110 US OB/GYN and women's health groups, with the parent organization above each one, and finds validated work emails and mobile numbers.
70% of US OB/GYN and women's health 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.
US OB/GYN and women's health groups by ownership
- Independent1,476
- Health system or hospital266
- Platform or corporate owner196
- Community or government119
- Other organization53
Sites of care beyond their own offices
See the parent organization above every US group
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
Each US OB/GYN and women's health 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 US OB/GYN and women's health 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 OB/GYN and women's health and that have a Medicare PAC ID.
FAQ
Frequently asked questions about US OB/GYN and women's health groups
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is the largest obstetrics and gynecology group in the US?
Ob Hospitalist Group, based in Greenville, South Carolina, with 862 OB-GYNs and 976 HCPs. Ob Hospitalist Group is second with 565.
What is the largest advanced practice midwife group in the US?
Diana Health, based in Smyrna, Tennessee, with 47 advanced practice midwife specialists and 116 HCPs. Diana Health is second with 39.
How many OB/GYN and women's health groups are in the US?
There are 2,110 OB/GYN and women's health groups in the US with a Medicare PAC ID: 1,881 obstetrics and gynecology and 229 advanced practice midwife. Between them they have 16,353 OB-GYNs and 760 advanced practice midwife specialists.
Which state has the most OB/GYN and women's health groups?
Texas, with 239, followed by California with 186 and New York with 167.
Which companies own the most OB/GYN and women's health groups?
By physicians, OB Hospitalist Group, with 4,485 across 45 groups, followed by HCA Healthcare with 477 and Unified Women's Healthcare with 2,359.
How many OB/GYN and women's health groups are independent?
1,476, or 70%, have no larger parent organization in the Dmand AI org hierarchy. 266 belong to a health system or hospital and 196 to a physician platform or corporate owner.
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