Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Dr. Marvin Williams, DO

Individual provider Maternal & Fetal Medicine Physician · NPI 1336121169

Dr. Marvin Williams, DO practises Obstetrics/Gynecology in Oklahoma City, Oklahoma. Graduated from Oklahoma State University College of Osteopathic Medicine in 1994, 32 years ago. Practices with Ou Health Partners Inc, a 1,167-clinician group and accepts Medicare assignment. Licensed in Ohio and Oklahoma.

Years since qualifying
32
Trained at
Oklahoma State University College of Osteopathic Medicine
Licensed in
OH, OK
In the registry since
2005
Specialties on file
2
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

825 NE 10th St OUPB3200
Oklahoma City, OK 73104-5417 Not confirmed with CMS for 18 years — call before visiting
Phone: (405) 271-5400
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Maternal & Fetal Medicine Physician (primary) Taxonomy 207VM0101X · Licence 3299 (OK)
Maternal & Fetal Medicine Physician Taxonomy 207VM0101X · Licence 34.007635 (OH)

Record details

NPI number1336121169
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedNovember 17, 2005
Last updated in NPPESApril 22, 2008

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyOBSTETRICS/GYNECOLOGY
Medical schoolOKLAHOMA STATE UNIVERSITY COLLEGE OF OSTEOPATHIC MEDICINE
Graduated 1994 (32 years in practice)
Group practice Ou Health Partners Inc — 1167 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients11
Services billed 31 a service is one billed item, such as a visit, a test or a procedure
Average patient age30

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $35 1 payment · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Ou Health Partners Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1167 clinicians in the practice; 12 are shown here.

Other providers in Oklahoma City