Mark E. Gregory, M.D.
Emergency Medicine Physician · Guthrie, OK
Mark E. Gregory, M.D. is an emergency medicine physician with a practice address in Guthrie, Oklahoma, and NPI 1659346963, issued on Feb 21, 2006. Check the license (Oklahoma 16492, as entered in NPPES) on the Oklahoma Board of Medical Licensure and Supervision; the Medicare figures below come from public CMS files.
- Name
- Mark E. Gregory
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 16492 OK
Self-reported in NPPES; status is on the state search - Practice location
- 200 S Academy RD, Guthrie, OK 73044
- Phone
- (405) 282-5125
- Enumerated
- Feb 21, 2006
- Record last updated
- May 20, 2014 (not updated in 12 years: call before relying on the address or phone)
- Medicaid ID
- 100231340A OK
- Entity
- Type 1 · individual
Also registered at 200 S Academy RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Melissa Ancik, PTPhysical Therapist1710060926
- Hannah Courtney, RD/LDRegistered Dietitian1144005893
- Candace Denson, PTAPhysical Therapy Assistant1316129000
- Chandra Dyer, ATCAthletic Trainer1306175385
- Christopher Howard, APRN-CNPAcute Care Nurse Practitioner1659884344
- Scott Interwicz, PAPhysician Assistant1902232937
Verify Mark E. Gregory 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 16492Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
5% fewer Medicare Part D claims than the average emergency medicine physician in 2024
214 Medicare Part D claims for 167 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. Brand-name drugs were 5% of claims. 32 claims were for opioids.
Most prescribed
- Hydrocodone-Acetaminophen25 claims
- Cephalexin16 claims
- Ondansetron Odt13 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.
Emergency Medicine Physician providers in Oklahoma
There are 748 emergency medicine physician records in Oklahoma.
Other emergency medicine physician records in Oklahoma
- David Abercrombie, MDOklahoma City, OK1023135506
- Bobby Abernathy, D.O.Tulsa, OK1114289659
- Ryan Acker, DOTulsa, OK1659949303
- Tyler Adams, D.O.Lawton, OK1538542170
- Tolulope Adepoju, MDNorman, OK1891425054
- Tinuola AgbabiakaOklahoma City, OK1790097459
- Kelechi Agu, MDTulsa, OK1831686526
- Azeemuddin Ahmed, MDOklahoma City, OK1609850148
- Noor Ahmed, DOTulsa, OK1679102446
- David AlexanderOklahoma City, OK1003418559
Common questions
What is Mark E. Gregory, M.D.'s NPI number?
Mark E. Gregory, M.D.'s National Provider Identifier (NPI) is 1659346963, issued on Feb 21, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark E. Gregory, M.D. located?
The NPPES record lists a practice address at 200 S Academy RD, Guthrie, OK, 73044. Phone: (405) 282-5125. Providers update this record themselves, so call before visiting.
How can I verify Mark E. Gregory, M.D.'s license?
NPPES lists Oklahoma license number 16492, 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 Mark E. Gregory, M.D. prescribe under Medicare Part D?
In 2024, Mark E. Gregory, M.D. had 214 Medicare Part D claims for 167 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.