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

William Obrien, MD

Individual provider Internal Medicine Physician · NPI 1578524963

William Obrien, MD practises Internal Medicine in Broken Arrow, Oklahoma. Qualified in 1996, 30 years ago. Practices with Clinton J Baird PLC, a 15-clinician group and accepts Medicare assignment. Licensed in Oklahoma.

Years since qualifying
30
Licensed in
OK
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1129 S Aspen Ave
Broken Arrow, OK 74012-4859 Not confirmed with CMS for 18 years — call before visiting
Phone: (918) 251-8900
Fax: (918) 293-3169
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 20338 (OK)

Record details

NPI number1578524963
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 28, 2006
Last updated in NPPESOctober 29, 2007

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Also practisesPSYCHIATRY
Medical schoolOTHER
Graduated 1996 (30 years in practice)
Group practice Clinton J Baird Plc — 15 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 patients16
Services billed 35 a service is one billed item, such as a visit, a test or a procedure
Average patient age62

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.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Clinton J Baird PLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 15 clinicians in the practice; 10 are shown here.

Other providers in Broken Arrow