William Obrien, M.D.
Internal Medicine Physician · Broken Arrow, OK
William Obrien, M.D. is an internal medicine physician with a practice address in Broken Arrow, Oklahoma, and NPI 1578524963, issued on Mar 28, 2006. Check the license (Oklahoma 20338, as entered in NPPES) on the Oklahoma Board of Medical Licensure and Supervision; the Medicare figures below come from public CMS files.
- Name
- William Obrien
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 20338 OK
Self-reported in NPPES; status is on the state search - Practice location
- 1129 S Aspen Ave, Broken Arrow, OK 74012
- Phone
- (918) 251-8900
- Enumerated
- Mar 28, 2006
- Record last updated
- Oct 29, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (918) 293-3169
- Medicare enrollment
- Enrolled (PECOS I20140826000397); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 1,115 in Oklahoma → Look up another NPI →
Also registered at 1129 S Aspen Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Tanith Garner, LCSWClinical Social Worker1386956217
- Jennifer Regester, LCSWClinical Social Worker1245589365
- Crystal Reneau, APRN-CNPFamily Nurse Practitioner1639942105
Verify William Obrien in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOklahoma Board of Medical Licensure and Supervision
Search for license 20338Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
71% fewer Medicare Part D claims than the average internal medicine physician in 2024
912 Medicare Part D claims for 52 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 30 claims were for opioids.
Most prescribed
- Omeprazole38 claims
- Trulicity37 claims
- Metformin Hcl31 claims
- Citalopram Hbr28 claims
- Atorvastatin Calcium25 claims
- Lisinopril25 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Clinton J Baird PLCTulsa, OK
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William Obrien among 1,115 internal medicine physician records in Oklahoma
William Obrien, M.D. is one of 1,115 internal medicine physician records with a practice address in Oklahoma. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 11% of them.
- NPI issued2006 · 11% of these records are older, 57% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated1996 · median 2007 among the 653 with a school on file
- Record last updated2007 · 56% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Oklahoma practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Internal Medicine Physician providers in Oklahoma
There are 1,115 internal medicine physician records in Oklahoma.
All 1,115 in Oklahoma → Every provider in Broken Arrow → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Angelo Argento, M.D.Broken Arrow, OK 740121467408831
- Laura Bilbruck, M.D.Broken Arrow, OK 740121245209113
- William Cook, MDBroken Arrow, OK 740121891759213
- Michelle Fugitt, D.O.Broken Arrow, OK 740121700845005
- Riley Hill, MDBroken Arrow, OK 740121508865361
- Felicia Lee, M.D.Broken Arrow, OK 740121023296746
- Robert Niebergall, MDBroken Arrow, OK 740121912975012
- Stephen Parker, M.D.Broken Arrow, OK 740121134108483
Common questions
What is William Obrien, M.D.'s NPI number?
William Obrien, M.D.'s National Provider Identifier (NPI) is 1578524963, issued on Mar 28, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William Obrien, M.D. located?
The NPPES record lists a practice address at 1129 S Aspen Ave, Broken Arrow, OK, 74012. Phone: (918) 251-8900. Providers update this record themselves, so call before visiting.
How can I verify William Obrien, M.D.'s license?
NPPES lists Oklahoma license number 20338, as entered by the provider. Search the Oklahoma Board of Medical Licensure and Supervision at https://www.okmedicalboard.org/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William Obrien, M.D. prescribe under Medicare Part D?
In 2024, William Obrien, M.D. had 912 Medicare Part D claims for 52 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.